Journal articles: 'Rock-socketed pile'

1

Liu, Xiao Li, and H. Zhou. "Investigation on Behavior of Rock-Socketed Retaining Piles for Deep Excavation." Key Engineering Materials 462-463 (January 2011): 825–30. http://dx.doi.org/10.4028/www.scientific.net/kem.462-463.825.

Full text

Abstract:

In the soil-rock mixed areas where the soils overlie on the rock layer, the rock-socketed retaining piles have been widely used for deep excavations. Up to date, little attention has been paid to performance of the rock-socketed piles used for deep excavation. Therefore, using the two-dimensional finite element program, Plaxis2D, a typical deep excavation engineering supported by rock-socketed piles with the whole embedded portion in rock is analyzed to investigate behavior of the rock-socketed retaining piles in detail. Computation results have shown that for rock-socketed retaining piles used in deep excavations, there exists an ultimate or a maximum rock-socketed depth which can be estimated by the pile diameter. For the ultimate rock-socketed depth, in the final excavation step, the first zero bending moment point of the rock-socketed part of the pile generally locates near the top surface of the rock layer. When the excavated surface is located at the top surface of the rock layer, the corresponding shear force distribution of the rock-socketed pile has an extremum at the same position.

APA, Harvard, Vancouver, ISO, and other styles

2

Bai, Xiaoyu, Xueying Liu, Mingyi Zhang, Yonghong Wang, and Nan Yan. "Ultimate Load Tests on Bearing Behavior of Large-Diameter Bored Piles in Weathered Rock Foundation." Advances in Civil Engineering 2020 (September 8, 2020): 1–13. http://dx.doi.org/10.1155/2020/8821428.

Full text

Abstract:

Based on the vertical compressive static load test and pile mechanics test of three large diameter bored piles (one of the test piles was treated with postgrouting) in granite gneisses foundation, the bearing capacity, deformation characteristics, and influencing factors of the single pile under the limit state are analyzed and compared with the recommended values of survey report and the recommended values of current codes. By comparing the measured and theoretical values of pile axial force, the bearing capacity of cast-in-place pile under normal and limit conditions is analyzed. The experimental results show that the Q-s curve of large-diameter rock-socketed mud wall retaining bored pile with a length-diameter ratio of 25–33 and rock-socketed depth of 5–8 d shows a rapid growth. After grouting treatment, the ultimate compressive bearing capacity of single pile is improved, the maximum settlement is reduced by 6.6%, the rebound rate is reduced by 11.1%, and the settlement effect of controlling pile top is not significant. The bearing capacity and deformation characteristics of the three test piles are less affected by length-diameter ratio and rock-socketed depth. For postgrouting piles, the ratio of frictional resistance of rock-socketed segment and the ratio of pile lateral resistance are less affected by length-diameter ratio and rock-socketed depth, while, for postgrouting piles, the ratio of pile lateral resistance is more affected by rock-socketed depth. The pile end resistance ratio of the three test piles is significantly affected by the rock-socketed depth, whether or not the pile side postgrouting treatment is carried out.

APA, Harvard, Vancouver, ISO, and other styles

3

Xing, Xiaobo, Xiangyang Li, Wei Li, Tu Lu, Xiaofeng Duan, and Qing Jin. "Numerical Analysis of the End-Suspended Pile and the Rock-Socketed Pile Bearing Capacity of a Soil-Rock Composite Foundation Pit." Advances in Civil Engineering 2022 (February 25, 2022): 1–15. http://dx.doi.org/10.1155/2022/1199548.

Full text

Abstract:

The bearing capacity of the rock-socketed part of the end-suspended pile and rock-socketed pile was investigated. Numerical models have been partially established with half of the pile and half of the pile space to simplify the model and reduce the number of elements. The strain-softening model was adopted for the rock mass, and the Coulomb friction model was used to simulate the friction between the pile and the soil. Subsequently, the stress deformation and bearing capacity were obtained in the numerical simulation analysis. Finally, the effects of the different support structures, rock-socketed depth, diameter, spacing, and rock shoulder width on piles were analyzed. The numerical results show that both the ultimate bearing capacity and the antideformation capacity of the end-suspended pile are lower than those of the rock-socketed pile. The bearing capacity of both the end-suspended pile and rock-socketed pile increases with an increase in rock-socketed depth, diameter, and spacing. In addition, the performance of the end-suspended pile is also positively correlated with the rock shoulder width.

APA, Harvard, Vancouver, ISO, and other styles

4

Wang, Tie Hang, Liang Zhang, Yan Zhou Hao, and Xin Jin. "Side Friction of Rock-Socketed Piles Involving Thick Sediment." Advances in Civil Engineering 2020 (December 16, 2020): 1–13. http://dx.doi.org/10.1155/2020/8882698.

Full text

Abstract:

This paper investigates the skin friction transfer characteristics of the rock-socketed section of a rock-socketed pile resting on thick sediment by conducting in situ core-drilling tests and static loading tests. Test results show that when using the impact hole-forming method in weakly cemented soil, a layer of sediment is deposited at the pile bottom. Due to the existence of sediment, when the load reaches a certain value, sudden and large subsidence is observed. This indicates that the end resistance does not contribute to the bearing capacity. Thus, it is not appropriate to consider both end resistance and side resistance in the existing design method of a rock-socketed pile. The bearing capacity of a single rock-socketed pile should be determined according to the side resistance of the soil layer and rock-socketed section only. Numerical analysis is performed to determine the deformation and load-carrying capacity of the pile and the distribution of friction on the sides of the rock-socketed segment. Under a given applied load, small settlement is observed when socketed thickness and rock strength are relatively large. The distribution of side friction of the socketed segment along the vertical direction shows a double-peak saddle shape. When the socketed thickness and rock strength are relatively smaller, the lower peak is higher than the upper peak, and conversely, when the socketed thickness and rock strength are relatively larger, the lower peak is smaller than the upper peak. For a given applied load on the pile top, smaller socketed thickness results in larger settlement and side friction. Due to the thick layer of sediment, the axial force of the rock-socketed segment of the pile gradually decreases along the vertical direction from the applied load on the pile top to zero at the bottom. According to the mechanical properties at different shear stages, a function is derived for the complete constitutive model for a pile-rock interface. Analytical solutions for the friction of a single pile are obtained under the conditions of failure and elasticity deformation of the surrounding rock. Its load transfer equation is derived as well. Accordingly, an equation is proposed for calculating the bearing capacity of rock-socketed piles resting on sediment at the bottom.

APA, Harvard, Vancouver, ISO, and other styles

5

Gao, Rui, Yan Qiang Wang, and Jun Yan. "Model Test of Socketed Depth’s Influence on Bearing Mechanism in Rock-Socketed Pile." Applied Mechanics and Materials 90-93 (September 2011): 332–36. http://dx.doi.org/10.4028/www.scientific.net/amm.90-93.332.

Full text

Abstract:

The socketed depth in rock-socketed pile can influence its bearing mechanism largely. At present the numerical simulation is used to study the socketed depth’s influence on pile’s bearing mechanism. It can reveal the pile bearing mechanism in some degree; however, there are some defects and limitations in simulation for its assumptions and simplifications. Based on the pile foundation of Tian-xing-zhou Bridge, the model test is conducted to study the socketed depth’ influence on rock-socketed pile bearing mechanism. In the model test, the socketed depth of model piles are made different ranging from 60mm to 200mm at the step of 20mm, and the bed rock is simulated with mixture of sand and plaster, the rock-soil overlain the bed rock is simulated with silty sand, the pile is simulated with organic glass rod according to similarity principle respectively. The results show that the settlement of top of model pile is smaller and the ratio of point resistance is smaller when the socketed depth is longer. When the socketed depth reaches 5D (D represents diameter of model pile), the ratio of point resistance is no more than 40%, and it is less than 1% when 8D. The conclusions drawed from model test are useful to deciding the length of pile foundation in Tian-xing-zhou Bridge.

APA, Harvard, Vancouver, ISO, and other styles

6

Bakri, Mudthir, Yuan You Xia, and Hua Bing Wang. "Numerical Analysis of Stabilization of Slopes Overlying Bedrock Using Piles and Effect of Socketed Length of Pile on Stability." Applied Mechanics and Materials 580-583 (July 2014): 424–31. http://dx.doi.org/10.4028/www.scientific.net/amm.580-583.424.

Full text

Abstract:

Piles are used widely for stabilization of landslides. To stabilize a slope settled on bedrock with piles the required factor of safety must be checked, and pile should be designed properly. Piles should be socketed into firm rock to prevent uprooting or overturning .In this research it is aimed to look into the socketed length of pile in bedrock. Therefore the parameters that affect the factor of safety of slope/pile system such as location, length, spacing and diameter of piles are analyzed. The effect of socketed length of pile in rock on pile behavior is investigated by plotting the shear force and bending moment diagrams along pile. The optimal pile position is found to be located slightly upper of the middle of the slope. The minimum socketed length after which the factor of safety will be remained constant is found to be 0.12L where L is pile length.FLAC3D computer code based on finite difference method is used to simulate the slope/pile system.

APA, Harvard, Vancouver, ISO, and other styles

7

Fa-you, A., Ming-chang Hei, Shi-qua Yan, and Peng Zhang. "Investigating the Effect of the Rock-Socketed Depth of the Hinged Cable-Anchored Pile on the Earthquake Response Characteristics of Supporting Structures." Advances in Civil Engineering 2022 (May 31, 2022): 1–11. http://dx.doi.org/10.1155/2022/2249654.

Full text

Abstract:

In order to meet the design requirements of the anti-slide pile, the form of the anchor-pull pile is often adopted in engineering applications. In the present study, the seismic response characteristics of hinged cable-anchored piles with different rock-socketed depths are analyzed using a large-scale seismic model test platform and numerical simulations. The obtained results show that the rock-socketed depth significantly affects the seismic response of the pile-anchor system. It is found that, as the rock-socketed depth increases under the same seismic conditions, the peak acceleration at the top of the anchored pile, the peak dynamic Earth pressure behind the pile, the axial force of the anchor rod, and the bending moment of the pile body decrease and the seismic stability of the anti-slide pile improves. It is concluded that, in the seismic design of anchor-pulled piles, increasing the rock-socketed depth of the anchor is an appropriate scheme to improve the seismic performance of anchor-pulled piles. The research results have a certain significance for improving the understanding of the seismic response law of hinged cable-anchored piles and improving the seismic design.

APA, Harvard, Vancouver, ISO, and other styles

8

Liu, Xueying, Xiaoyu Bai, Mingyi Zhang, Yonghong Wang, Songkui Sang, and Nan Yan. "Load-Bearing Characteristics of Large-Diameter Rock-Socketed Piles Based on Ultimate Load Tests." Advances in Materials Science and Engineering 2020 (July 26, 2020): 1–12. http://dx.doi.org/10.1155/2020/6075607.

Full text

Abstract:

As part of a large converter project in Shandong Province, vertical static load tests and internal force tests were conducted on three large-diameter rock-socketed piles, their load transfer mechanism was clarified, and the ultimate side resistance and ultimate resistance performance characteristics of the rock-socketed sections were analyzed. The test results showed that the three test piles were damaged under maximum loading, the Q-s curve exhibited a steep drop, the pile compression was around 1.2 times the pile diameter, and the bearing capacity of a single pile did not meet the design requirements. The side and end resistances of the three test piles all reached their ultimate values, but the ultimate side resistance was lower than the lower limit of the recommended value in the current technical code for building pile foundations. The end resistance under maximum loading accounted for 38.4–53.8% of the peak load, which was relatively high. By comparing it with other studies, there was no significant correlation between the coefficient of rock ultimate side resistance of the rock-socketed segment and the pile diameter of the rock-socketed segment. However, the coefficient of ultimate resistance increased gradually with the pile diameter. However, the latter correlation was not significant when the pile diameter was less than 1000 mm.

APA, Harvard, Vancouver, ISO, and other styles

9

Xu, Feng, Guoliang Dai, Weiming Gong, Xueliang Zhao, and Fan Zhang. "Lateral Loading of a Rock–Socketed Pile Using the Strain Wedge Model Based on Hoek–Brown Criterion." Applied Sciences 12, no. 7 (March 30, 2022): 3495. http://dx.doi.org/10.3390/app12073495.

Full text

Abstract:

Rock–socketed pile under lateral loading is important in engineering practice. It is very significant to calculate the lateral bearing capacity of rock–socketed piles since few studies focus on this problem. The rock cohesion and instantaneous angle of friction, which have a high correlation with confining pressure, are obtained. Moreover, the strain wedge model is modified from three aspects: the assumption of nonlinear displacement; the stress level related to cohesion and friction angle; and the pile side resistance. Then, the modified strain wedge model is employed to deduce p–y criterion for rock–socketed pile considering Hoek–Brown failure criterion. The fourth-order partial differential equation constructed according to the p–y curve is solved by using the finite difference method. A numerical method with 2 m diameter rock-socketed pile is given to validate the rationality of the proposed method. It is shown that the proposed could predict the pile deformation well, and the responses are considered acceptable.

APA, Harvard, Vancouver, ISO, and other styles

10

Wu, Zhaoqi, Xingcheng Zhang, Qiming Song, Wei Liu, and Zhibing Chen. "Numerical analysis of horizontal bearing capacity of large-diameter implanted rock-socketed piles for offshore wind turbines." Journal of Physics: Conference Series 2280, no. 1 (June 1, 2022): 012012. http://dx.doi.org/10.1088/1742-6596/2280/1/012012.

Full text

Abstract:

Abstract There is no standard for rock-socketed pile foundation of offshore wind farm at China and abroad. According to the practical geological and environmental conditions of offshore wind power plant, response of rock-socketed pile under horizontal load was analyzed by using a finite element software, ABAQUS. Then, the parameters of rock-socketed pile, i.e. depth, pile diameter, ratio of pile diameter to thickness, and grouting thickness were investigated by orthogonal analysis and parametric analysis. It is found that the thickness of grouting has little influence on the displacement of pile head. The diameter and the ration of diameter to thickness of pile, rock-socketed depth have significant influence. The displacement of pile tip tends to stable and the bending moment at bottom of pile become zero when the rock-socketed depth reaches 3dp. The maximum Tresca stress of grouting body and 1st principal stress of rock mass decrease with an increase of rock-socketed depth.

APA, Harvard, Vancouver, ISO, and other styles

11

Wu, Zhaoqi, Xingcheng Zhang, Qiming Song, Wei Liu, and Zhibing Chen. "Numerical analysis of horizontal bearing capacity of large-diameter implanted rock-socketed piles for offshore wind turbines." Journal of Physics: Conference Series 2280, no. 1 (June 1, 2022): 012012. http://dx.doi.org/10.1088/1742-6596/2280/1/012012.

Full text

Abstract:

Abstract There is no standard for rock-socketed pile foundation of offshore wind farm at China and abroad. According to the practical geological and environmental conditions of offshore wind power plant, response of rock-socketed pile under horizontal load was analyzed by using a finite element software, ABAQUS. Then, the parameters of rock-socketed pile, i.e. depth, pile diameter, ratio of pile diameter to thickness, and grouting thickness were investigated by orthogonal analysis and parametric analysis. It is found that the thickness of grouting has little influence on the displacement of pile head. The diameter and the ration of diameter to thickness of pile, rock-socketed depth have significant influence. The displacement of pile tip tends to stable and the bending moment at bottom of pile become zero when the rock-socketed depth reaches 3dp. The maximum Tresca stress of grouting body and 1st principal stress of rock mass decrease with an increase of rock-socketed depth.

APA, Harvard, Vancouver, ISO, and other styles

12

Maralapalle, V., and R. A. Hegde. "An Experimental Study on the Socketed Pile in Soft Rock." Engineering, Technology & Applied Science Research 12, no. 6 (December 1, 2022): 9665–69. http://dx.doi.org/10.48084/etasr.5338.

Full text

Abstract:

Pile foundation systems are used in India in many projects such as metro and railways, flyovers, and multi-story buildings. The pile transfers superstructure load to the substructure, i.e. to rock layers by means of skin resistance and end-bearing resistance. In this study, an attempt is made to observe the performance of socketed piles in soft rock. A series of socketed small-scale model pile load laboratory studies have been conducted using the loading frame. Load tests were performed on a model steel pile to calculate its axial load-bearing capability at various socket depths. An unconfined compression test was performed on pseudo-rock variations to find out the properties of the soft rock used. The results showed the ability of the drilled pile to enhance the strength of the pseudo rock. An attempt was also made to calculate the optimum depth for the socketed pile in soft rock.

APA, Harvard, Vancouver, ISO, and other styles

13

Yang, Bai, Jianlin Ma, Wenlong Chen, and Yanxin Yang. "Uplift Behavior of Belled Short Piles in Weathered Sandstone." Mathematical Problems in Engineering 2018 (September 16, 2018): 1–8. http://dx.doi.org/10.1155/2018/8614172.

Full text

Abstract:

Field pull out test results of 500 kV double-circuit line of Luping-Fule are presented in this paper to investigate the uplift bearing behavior of rock-socketed belled short piles. A calculation model of rock-socketed belled short pile has been proposed. During the initial stage of loading test, uplift load is shared by even section and bell of the pile, and the bell continues to bear uplift load after the lateral resistance of even section pile reaches the limit. A different performance has been found on the case of long belled pile. At the ultimate state, the uplift resistance provided by bell accounts for about 54.9% and 34.7% of the total uplift capacity for the 6.0 m long and 7.0 m long piles, respectively. Increasing pile length has been found to noticeably increase the ultimate uplift bearing capacity, while it has less effect on the displacement of pile top. The uplift capacity of even section pile is associated with the shear strength of rock mass around the pile, and the test results demonstrate that the ultimate resistance can be equal to the shear strength. The calculation method proposed in this paper is proven to be able to accurately predict the ultimate uplift bearing capacity of the rock-socketed belled short piles.

APA, Harvard, Vancouver, ISO, and other styles

14

Wang, Kui Hua, Wen Bing Wu, Deng Hui Wu, and Zhi Qing Zhang. "Study of the Influence of Sediment Properties on Complex Impedance at the Head of Rock-Socketed Pile." Advanced Materials Research 368-373 (October 2011): 2939–44. http://dx.doi.org/10.4028/www.scientific.net/amr.368-373.2939.

Full text

Abstract:

Based on virtual soil pile model, the influence of sediment properties on complex impedance at the head of rock-socketed pile is theoretically investigated by virtue of Laplace transform technique and impedance function transfer method. Firstly, the sediment under pile toe is assumed to be virtual soil pile which the cross-section area is the same as the pile. The layered soils surrounding pile are described with plane strain model. Then, by means of initial conditions and boundary conditions of the soil-pile system, the complex impedance at rock-socketed pile head in frequency domain is derived at condition of arbitrary excitation on the pile head. At last, by using parametric study method, the influence of sediment properties on complex impedance at rock-socketed pile head is studied. It is shown that sediment properties have significant influence on complex impedance at the head of rock-socketed pile.

APA, Harvard, Vancouver, ISO, and other styles

15

Wang, Peisen, Puyang Zhang, Wenjun Hu, and Dapeng Qiu. "Seismic Response Analysis of Rock-Socketed Piles in Karst Areas under Vertical Loads." Applied Sciences 13, no. 2 (January 5, 2023): 784. http://dx.doi.org/10.3390/app13020784.

Full text

Abstract:

Karst landforms constitute one of the most harmful geological conditions, which have an adverse effect on the deep foundation structures of bridges. During earthquakes, the existence of karst caves can cause serious seismic damage to the bridge pile foundation. In order to investigate the seismic response of rock-socketed piles under vertical loads in complex karst cave conditions, finite element numerical simulation analyses were carried out, referring to the practical major bridge structure rock-socketed pile project in China. The peak strain distributions of rock-socketed pile foundation influenced by single-karst cave factors under the combined action of vertical loads and ground motions were investigated, and the influences of complex multi-caves were further explored. The results showed that the restraint effect of the bedrock near the pile would gradually decrease with the increase of the height of the karst cave and the decrease of the height of the karst cave roof; under the condition of a beaded karst cave, the constraint of bedrock between the karst caves makes the pile present the distribution characteristics of “multi-segment and multi-broken line”; under the condition of an underlying karst cave, the existence of the underlying karst cave would decrease the restraint of the bedrock at the bottom pile and increase the peak strain of the pile to a certain extent. This paper revealed the seismic response law of the rock-socketed pile under vertical loads within various complex karst cave conditions and developed reasonable reinforcement measures aiming at dangerous locations, providing important engineering guidance and a reference for the seismic design of rock-socketed pile foundation in complex karst areas.

APA, Harvard, Vancouver, ISO, and other styles

16

Liu, Junxiu, Xianfeng Shao, Xuhui Huang, and Guangyong Cao. "Study on Behavior and Bearing Capacity Computation Method of Shallow Rock-Socketed Short Piles Based on the Self-Balanced Loading Test." Computational Intelligence and Neuroscience 2022 (March 14, 2022): 1–11. http://dx.doi.org/10.1155/2022/7272219.

Full text

Abstract:

The self-balanced loading test is a state-of-art pile testing method, but its suitability to pile bearing capacity determination in transformer substation engineering in mountainous and hilly areas is not yet clear. In this study, a two-dimensional axisymmetric numerical model is established by the PLAXIS software to simulate the behavior and bearing mechanism of shallow rock-socketed short piles based on the self-balanced loading test. The model is first validated by simulating the field tests of two adjacent piles under self-balanced loading. Then the influence factors of the load-displacement curves of piles are analyzed. Thereafter, the mechanical mechanism of the self-balanced loading tests is simulated and compared with the conventional static loading tests. It is observed that the rock modulus, rock-socketed depth of piles, and burial depth of the Osterberg Cell affect the load-displacement significantly, but the cohesion of the rocks affects little. Moreover, compared with the conventional static loading tests, the shear stress of the pile-soil interface distributes less uniformly under self-balanced loading conditions. On this basis, a bearing capacity computation method of shallow rock-socketed short piles based on the self-balanced loading test is proposed.

APA, Harvard, Vancouver, ISO, and other styles

17

Luo, Yang, Heng Liu, and Tie Hang Wang. "Overview on the Bearing Behavior Research of Rock-Socketed Piles." Applied Mechanics and Materials 353-356 (August 2013): 172–76. http://dx.doi.org/10.4028/www.scientific.net/amm.353-356.172.

Full text

Abstract:

It mainly reviewed the current research status of the bearing characteristic of rock-socketed piles. From reading all kinds of calculation model in different code, it pointed out the disadvantages. It concluded the present work on the two main factors which influence the bearing capacity of rock-socketed pile most. Based on this work, it figures out the deficiencies of the research presently and prospects the future research. In the end, it suggests that the bearing behavior and failure mechanism of rock-socketed piles with thick sediments remains need to be further discussed.

APA, Harvard, Vancouver, ISO, and other styles

18

Wang, Gui Jun, and Yong Zhang. "Work Mechanisms of Pile Foundation in the Karst Region." Applied Mechanics and Materials 170-173 (May 2012): 88–92. http://dx.doi.org/10.4028/www.scientific.net/amm.170-173.88.

Full text

Abstract:

The stability and deformation characteristics of the pile foundation in the Karst region of the super big railway bridge Chaogou under different loading levels are analyzed using the FDM-software, FLAC3D. In the analyses the socketed depth of piles, the properties of soil and rock mass, the scale, space position and filling situation of the Karst caves and the features of the contact interfaces between piles and soil and rock mass were taken into account. The research results show that the original design of the pile foundation is safe and the safety coefficient is greater than 2. The bond strength of the contact surface between pile and soil and rock is a controlling factor for the stability of pile foundation. Therefore, injection after construction is suggested to be used when needed, in order to increase the bond strength of the contact surface. The research leads to a conclusion that the mechanisms and the characteristics of the rock socketed piles can be more clearly interpreted in numerical analyses by referring the principle of the interaction between piles and rock, pile foundation and Karst, resistance of both pile ends and sides.

APA, Harvard, Vancouver, ISO, and other styles

19

He, Chun Lin, and Cheng Zhong Gong. "Situ Tests of Bearing Character on Large Diameter Deep Socketed Pile in Qingdao Gulf Bridge." Applied Mechanics and Materials 178-181 (May 2012): 2501–4. http://dx.doi.org/10.4028/www.scientific.net/amm.178-181.2501.

Full text

Abstract:

With the development of long-span bridge engineering and increase of load on construction, the piles which socketed in rock more than 5 diameters have been used in some bridge engineering. Based on the technique of Anchored piles method, the static load tests of large diameter and deep socketed piles had been carried out in Qingdao Gulf Bridge. The bearing characteristics of large diameter pile were analyzed, including the load displacement curves of test pile; the axial force; the relationship between side friction and displacement and the sharing ratio of side resistance and end resistance. Finally, the test results were compared with specifications, The results showed that the bearing characteristic of deep socketed piles was as same as the friction piles in this area; from the results of test the side friction of pile could be estimated lower in strongly weathering breccia area while the friction in strong- weakly weathered breccia was relatively close to the value of exploration reports. At the bottom of the pile, because the relatively displacement of pile-rock was small, the pile side resistance is relatively small. It could be seen that the estimate of bearing capacity was less than the test result, and the pile foundation was safety enough.

APA, Harvard, Vancouver, ISO, and other styles

20

Liu, Chun Lin, Shuo Zhang, Meng Xiong Tang, He Song Hu, Zhen Kun Hou, and Hang Chen. "Vertical Dynamic Response of Rock-Socketed Piles in a Layered Foundation." E3S Web of Conferences 173 (2020): 04002. http://dx.doi.org/10.1051/e3sconf/202017304002.

Full text

Abstract:

A simplified method is presented to investigate the dynamic response of rock-socketed piles embedded in a layered foundation. The finite element method is utilized to derive the dynamic stiffness matrix equations of the pile modelled as a 1D bar, and the exact stiffness matrix method is employed to establish the flexibility matrix equations of the foundation modelled as a 3D body. According to the pilesoil interaction condition, these matrices are incorporated together to obtain the solution for the dynamic response of rock-socketed piles. Finally, some numerical results are given to illustrate the influence of rocksocketed depth on the pile vertical impedance.

APA, Harvard, Vancouver, ISO, and other styles

21

Deng, Yong Liang, Ying Lu, Qi Ming Li, Kang An, and Shuai Niu. "Research on Stability of the Rock-Socketed Piles in a Landslide Control Project." Applied Mechanics and Materials 477-478 (December 2013): 435–38. http://dx.doi.org/10.4028/www.scientific.net/amm.477-478.435.

Full text

Abstract:

In order to study the stability of rock-socketed piles in landslide control project, this paper took a practical engineering as example, employed the ANASYS software platform as the implementation tool to establish the finite element analysis model. In this analysis, the Drucker-Prager criterion was selected and several differentiated models were established to research the influence of different socketed depth on rock stability. The result indicates that when the embedding depth is constant, the deformation of rock is growing with the increasing of load. When entering into the plastic response, the crack eventually developed into plastic zone around the rock-socketed pile; the adverse effects of the bottom rock would be smaller complying with the deeper of the pillar embedding into the rock; the cost increases with depth of embedded part in practical engineering, according to this research, it is economical and reasonable to choose triple pile diameter as the embedded depth.

APA, Harvard, Vancouver, ISO, and other styles

22

Wang, Yan Qiang, Rui Gao, and Ya Wu Zeng. "Model Test of Roughness’ Influence on Bearing Mechanism in Rock-Socketed Pile." Advanced Materials Research 243-249 (May 2011): 3072–77. http://dx.doi.org/10.4028/www.scientific.net/amr.243-249.3072.

Full text

Abstract:

The interface roughness between pile and rock in rock-socketed pile can influence its bearing mechanism largely. At present the numerical simulation, which simulates the interface roughness with changing the surface shape or interface friction coefficient, is used to study the interface roughness’ influence on pile’s bearing mechanism. It can reveal the pile bearing mechanism in some degree; however, there are some defects and limitations in simulation because of its assumptions and simplifications. Based on the pile foundation of Tian-xing-zhou Bridge, the model test is conducted to study the interface roughness’ influence on rock-socketed pile bearing mechanism. In the model test, the surface of model piles are made different ranging from smooth to rough, and the bed rock is simulated with mixture of sand and plaster, the rock-soil overlain the bed rock is simulated with silty sand, the pile is simulated with organic glass rod according to similarity principle respectively. The results show that load-settlement curves grow more gently, the ultimate bearing capacity is bigger, the proportion of point resistance is lower, and the shaft resistance is bigger which reaches more than 70% of total loading as the surface of pile is rougher. The conclusions are useful to deciding the length of pile foundation in Tian-xing-zhou Bridge.

APA, Harvard, Vancouver, ISO, and other styles

23

Qingke, Nie, Li Xilai, Yuan Wei, Wang Anli, Wang Wei, Jia Xiangxin, and Shang Weidong. "Calculation Method for the Critical Thickness of a Karst Cave Roof at the Bottom of a Socketed Pile." Advances in Materials Science and Engineering 2021 (December 16, 2021): 1–11. http://dx.doi.org/10.1155/2021/1669410.

Full text

Abstract:

The thickness of a karst cave roof at the bottom of a socketed pile plays an important role in the vertical bearing capacity of the socketed pile in the karst region. In practice, its thickness is simply recommended to be not less than 3 times the diameter of the socketed pile, regardless of the geological conditions and the size of the cave itself. In this study, we present an approach for calculating the critical thickness-to-diameter ratio of a karst cave roof η (η = h/d, the ratio of karst cave roof thickness to pile diameter) based on the generalized Hoek–Brown criterion by virtue of the limit analysis method, which considers the pile tip load, hardness degree of the intact rock, and rock mass quality. The analysis results show that less load at the bottom of the pile, higher quality of rock mass, and more hard rock all lead to a smaller critical thickness-diameter ratio, whereas the critical thickness-to-diameter ratio is greater. The validity of the proposed method is verified through a physical model test.

APA, Harvard, Vancouver, ISO, and other styles

24

Cheng, Yongjin, Yong Zhou, Weijiang Chu, and Ze Su. "Load-bearing Behavior of Offshore Rock Socketed Monopile Foundation Regarding Different Rock Mass Classification." Journal of Physics: Conference Series 2381, no. 1 (December 1, 2022): 012088. http://dx.doi.org/10.1088/1742-6596/2381/1/012088.

Full text

Abstract:

Abstract With the increasing electricity demand in China, wind power has been heavily developed in recent years. It is important to stabilize the wind turbine foundations in rock bedded near the sea area while installation. Based on different rock classification standards (GB 50218 and GSI), this paper numerically analyzed the load capacity of rock socketed monopile. When the rock class is high (class III and above), under effective socketed depth, the rock-socket effect is important, and the pile tip deflection is nearly 0, which could be considered as a clamping constraint. In this case, even if the rock quality around the pile tip decreases a little or becomes a little weakened, the pile deformation and internal force will not change a lot. However, when the rock mass class is lower than IV, the pile tip load capacity will largely decrease. The definition of rock mass parameters is also important when analyzing rock socketed monopile. In conclusion, it is suggested to take GB 50218 as a reference. BQ engineering rock mass classification and its corresponding rock mass parameters could be applied. Also, the M-C model is suggested to be used for some related work.

APA, Harvard, Vancouver, ISO, and other styles

25

Li, Pengfei, Tao Zhang, and Chengzhi Wang. "Behavior of Concrete-Filled Steel Tube Columns Subjected to Axial Compression." Advances in Materials Science and Engineering 2018 (August 26, 2018): 1–15. http://dx.doi.org/10.1155/2018/4059675.

Full text

Abstract:

The behavior of concrete-filled steel tube (CFST) columns subjected to axial compression was experimentally investigated in this paper. Two kinds of columns, including CFST columns with foundation and columns without foundation, were tested. Columns of pure concrete and concrete with reinforcing bars as well as two steel tube thicknesses were considered. The experimental results showed that the CFST column with reinforcing bars has a higher bearing capacity, more effective plastic behavior, and greater toughness, and the elastoplastic boundary point occurs when the load is approximately 0.4–0.5 times of the ultimate bearing capacity. The change of rock-socketed depth and the presence of steel tube will affect the ultimate bearing capacity of rock-socketed pile. The bearing capacities of the rock-socketed CFST columns are lower than those of rock-socketed columns without a steel tube under a vertical load; besides, the greater the rock-socketed depth, the greater the bearing capacity of the rock-socketed piles. In addition, a numerical comparison between the ultimate load and the theoretical value calculated from the relevant specifications shows that the ultimate load is generally considerably greater than the theoretical calculation results.

APA, Harvard, Vancouver, ISO, and other styles

26

Xu, Qingchao, Zhenhao Bao, Tu Lu, Huarui Gao, and Jiakang Song. "Numerical Simulation and Optimization Design of End-Suspended Pile Support for Soil-Rock Composite Foundation Pit." Advances in Civil Engineering 2021 (July 1, 2021): 1–15. http://dx.doi.org/10.1155/2021/5593639.

Full text

Abstract:

In order to design the soil-rock combination foundation pit more safely and effectively, this paper presents the investigations of the mechanical and deformational characteristics of end-suspended piles supporting the structures in Jinan CBD area. Based on the measured data, a finite element model was established through the two-dimensional numerical simulation method to study the deformational characteristics of the end-suspended piles, and the influences of the depth of socketed rock, the width of rock shoulder, and the prestress of anchor cables on the deformations and mechanical property of end-suspended piles were discussed. Some optimization methods are proposed based on these analyses. Results show the following: (1) Rock-socketed depths have boundary effect on end-suspended piles. Under the given geological conditions, the reasonable socketed ratio is within 0.158∼0.200. (2) The anchor cable prestress can effectively slow down the ground settlement, the force, and deformation of the pile body and can be set to 1P∼1.25P under the conditions of the site. (3) Rock-shoulder width has little influence on the ground settlement and horizontal displacement of piles. The reserved width of rock shoulder is suggested to be selected in the range of 1.0 m∼1.5 m.

APA, Harvard, Vancouver, ISO, and other styles

27

Yang, Hui, Xue Liang Jiang, and Jun Fu. "Vertical Loading Test on the Bearing Capacity of Large-Diameter Filling-Piles in the Mudstone and Sandstone Foundation." Advanced Materials Research 639-640 (January 2013): 587–92. http://dx.doi.org/10.4028/www.scientific.net/amr.639-640.587.

Full text

Abstract:

Based on the vertical loading test results of large-diameter filling pile near an electric factory in the sandstone and mudstone foundation, the load transfer mechanism and vertical loading bearing behavior of the pile were discussed. The analysis shows that the pile mainly behaves as friction piles and the vertical bearing capacity is mainly supplied by side friction resistance. The pile side friction is related to the section displacement of pile, the pile load and the soil characteristic. The pile end resistence is related to pile end settlement, pile diameter, rock-socketed length,rock elasticity modulus of pile end, sediment thickness and pile construction technical. The pile end resistence linearly increases with the settlement of pile end. In tis paper, the dead-load test is recommended in determination the pile bearing capacity and the sediment thickness should be strictly controlled in order to meet the standard. In the intermediary weathered sand-mudstone, the pile end should inset two times of pile diameter for pile whose diameter is 800mm. The pile end should inset 2 meters for pile whose diameter is 1500mm.

APA, Harvard, Vancouver, ISO, and other styles

28

Dai, Guo Liang, Abdellatif Boucheloukh, and Wei Ming Gong. "Review of Design Methods of the Ultimate Side Shear and Base Resistance for Rock-Socketed Pile." Applied Mechanics and Materials 353-356 (August 2013): 60–67. http://dx.doi.org/10.4028/www.scientific.net/amm.353-356.60.

Full text

Abstract:

To determine the ultimate load capacity of drilled shaft socketed into rock under axial compression loading, it is necessary to predict both the ultimate side shear resistance and the base resistance based on field load test or/ and laboratory tests. In geotechnical engineering there are several methods proposed the relationship between rock properties (the unconfined compressive strength) and the ultimate side shears resistance and base resistance. This paper presents the review of design methods of ultimate side shear and base resistance for rock-socketed pile. These empirical functions depend on the socket type and the range of the unconfined compressive strength of rock.

APA, Harvard, Vancouver, ISO, and other styles

29

Dykeman, P., and A. J. Valsangkar. "Model studies of socketed caissons in soft rock." Canadian Geotechnical Journal 33, no. 5 (November 6, 1996): 747–59. http://dx.doi.org/10.1139/t96-100-321.

Full text

Abstract:

Results of centrifuge modelling of socketed caissons in a weak model rock made of cement, sand, bentonite, and water are presented. The model socketed caissons were made from aluminium tubing with a structural stiffness closely identical to a solid concrete pile. In the first series of tests, model sockets were tested in axial compression to determine the effect of socket roughness on side resistance. In the second series, model sockets were subjected to lateral loading. The experimental results are compared with existing design methods used to predict ultimate capacity and load deformation response. Data obtained from other model studies and full-scale tests are also presented and compared with the centrifuge modelling data. Key words: socketed caissons, centrifuge modelling, weak rock, lateral deformation, axial deformation.

APA, Harvard, Vancouver, ISO, and other styles

30

Gong, Cheng Zhong, Chun Lin He, and Ming Xing Zhu. "Numerical Simulation Analysis of Bearing Characteristics on Super-Large Diameter Rock Socketed Pile." Applied Mechanics and Materials 580-583 (July 2014): 432–35. http://dx.doi.org/10.4028/www.scientific.net/amm.580-583.432.

Full text

Abstract:

Wujiang Bridge is located on the Wujiang River in Chongqing Province in China. Based on test method of numerical simulation, the bearing characteristics of this large-diameter rock-socket pile with super-thick pile caps have been analyzed, including pile foundation load-bearing characteristics, pile-soil load sharing, and stress flow analysis of thick pile caps. The results indicated that Q-s curve of this kind of pile is approximate to linear. Under the action of ultimate load, the main load was supported by pile end résistance. And according to main stress distribution of pile cap, there is an obvious spatial truss effect phenomenon in it.

APA, Harvard, Vancouver, ISO, and other styles

31

Mei, Can, Qing Fang, Haowei Luo, Jiangang Yin, and Xudong Fu. "A Synthetic Material to Simulate Soft Rocks and Its Applications for Model Studies of Socketed Piles." Advances in Materials Science and Engineering 2017 (2017): 1–8. http://dx.doi.org/10.1155/2017/1565438.

Full text

Abstract:

A detailed manufacturing procedure of a synthetic soft rock is presented, as well as its applications on the laboratory experiments of socketed piles. With the homogeneity and isotropy of the simulated soft rock, the influence of different variables on the bearing performance could be investigated independently. The constituents, cement, gypsum powder, river sand, concrete-hardening accelerator, and water, were mixed to form the specimens. Both uniaxial and triaxial compressive tests were conducted to investigate the stress-strain behavior of the simulated soft rock. Additionally, the simulated soft rock specimens were used in model pile tests and simple shear tests of the pile-rock interface. Results of the simulated soft rock in both the uniaxial and triaxial compressive tests are consistent with those of natural soft rocks. The concrete-hardening accelerator added to the mixtures improves the efficiency in laboratory investigations of soft rock specimens with a curing time of 7 days. The similarities between the laboratory tests and the field observations provide convincing evidence to support its suitability in modeling the behavior of soft rocks.

APA, Harvard, Vancouver, ISO, and other styles

32

Lu, Yao, Dejian Li, Shiwei Jia, and Kai Wang. "A New Method for Evaluating the Bearing Capacity of the Bridge Pile Socketed in the Soft Rock." Applied Sciences 11, no. 13 (June 25, 2021): 5923. http://dx.doi.org/10.3390/app11135923.

Full text

Abstract:

Aiming at the rock-socketed pile in the soft rock area, this paper studies the inherent constitutive relationship between the vertical restraint stiffness at the pier bottom and the bearing capacity of the pile foundation. A new method to evaluate the bearing capacity of the pile foundation is proposed. Based on the Rayleigh energy method and the Southwell frequency synthesis method, the analytical expression of the vertical vibration fundamental frequency of the pier was calculated, and the constraint stiffness expression of the pier bottom was derived. By investigating the impact of parameters on the bearing capacity coefficient of the pile foundation, the fitting formula of the bearing capacity coefficient was obtained by multiple linear regression. Then, with this method, the vertical fundamental frequency of the pier was obtained through a field dynamic test to calculate the vertical constraint stiffness and evaluate the bearing capacity of the rock-socketed pile in the soft rock area. This method can overcome the shortcomings of the traditional static load test method, such as the high cost, long cycle, and poor representativeness. Finally, this method’s accuracy was verified by comparing field measurements and finite element simulation results. The results show that the difference between the code design constraint stiffness and the constraint stiffness by the frequency synthesis method was about 0.7%, and the bearing capacity difference between the analytical solution and the numerical simulation was small. The new method is accurate and effective.

APA, Harvard, Vancouver, ISO, and other styles

33

Liu, Qi Xia, and Liang Fan. "The Combined Guiding Hole Technology of Large Diameter DTH Hammer and Long Screw-Pile Driver." Applied Mechanics and Materials 190-191 (July 2012): 1220–26. http://dx.doi.org/10.4028/www.scientific.net/amm.190-191.1220.

Full text

Abstract:

From an engineering reality, in order to solve complex stratigraphic drilling problems and improve construction efficiency, the method of combination of large diameter DTH hammer and the pile driver with a special long spiral drill multifunctional is proposed. This method has the characteristics of simple equipment, fast, effective, low cost etc. It can quickly drill through layers of gravel, stone, weathered bedrock, reach to depth up to above 25m. It has been widely used in embedded engineering methods of precast piles, the long spiral rock-socketed piles, piles into the rock currently. The study of this construction method has not only wide range of applications, but also has a wide range of practical and theoretical significance.

APA, Harvard, Vancouver, ISO, and other styles

34

Liu, Qi Xia, and Liang Fan. "The Combined Guiding Hole Technology of Large Diameter DTH Hammer and Long Screw-Pile Driver." Applied Mechanics and Materials 204-208 (October 2012): 181–87. http://dx.doi.org/10.4028/www.scientific.net/amm.204-208.181.

Full text

Abstract:

From an engineering reality, in order to solve complex stratigraphic drilling problems and improve construction efficiency, the method of combination of large diameter DTH hammer and the pile driver with a special long spiral drill multifunctional is proposed. This method has the characteristics of simple equipment, fast, effective, low cost etc. It can quickly drill through layers of gravel, stone, weathered bedrock, reach to depth up to above 25m. It has been widely used in embedded engineering methods of precast piles, the long spiral rock-socketed piles, piles into the rock currently. The study of this construction method has not only wide range of applications, but also has a wide range of practical and theoretical significance.

APA, Harvard, Vancouver, ISO, and other styles

35

Haberfield, C., and B. Collingwood. "Rock-socketed pile design and construction: a better way?" Proceedings of the Institution of Civil Engineers - Geotechnical Engineering 159, no. 3 (July 2006): 207–17. http://dx.doi.org/10.1680/geng.2006.159.3.207.

Full text

APA, Harvard, Vancouver, ISO, and other styles

36

Lei, Yong, Minghua Zhao, and Binhui Ma. "Calculation Method for the Socketed Length of the Rock Socketed Pile by the Settlement of the Pile Top." Journal of Highway and Transportation Research and Development (English Edition) 6, no. 3 (September 2012): 65–71. http://dx.doi.org/10.1061/jhtrcq.0000109.

Full text

APA, Harvard, Vancouver, ISO, and other styles

37

Zhan, Caizhao, and Jian-Hua Yin. "Field static load tests on drilled shaft founded on or socketed into rock." Canadian Geotechnical Journal 37, no. 6 (December 1, 2000): 1283–94. http://dx.doi.org/10.1139/t00-048.

Full text

Abstract:

The Mass Transit Railway Corporation proposes to construct the Tseung Kwan O Depot (TKD) within Area 86 reclamation at Tseung Kwan O as part of the Tseung Kwan O Extension. The proposed foundation for the TKD comprises about 1000 large-diameter, bored, cast in situ, drilled shafts founded on or socketed into rock. To confirm the design allowable end bearing capacity and rock socket side resistance for the drilled shaft foundations, two test piles were constructed and tested. Both test piles were instrumented with strain gauges and rod extensometers. This paper presents the static compressive load test results on both test piles. The test results indicate that an end bearing capacity of 20.8 MPa (design allowable 7.5 MPa) and rock socket side resistance 2.63 MPa (design allowable 0.75 MPa) are achieved during the pile load tests with no sign of failure.Key words: drilled shaft, static load test, end bearing capacity, rock socket, rock socket side resistance, load transfer.

APA, Harvard, Vancouver, ISO, and other styles

38

Zhang, Xiaolong, Lunliang Duan, and Duoyin Wang. "Numerical Analysis of Horizontal Impact Resistance of Rock Socketed Pile with Steel Casing." Advances in Civil Engineering 2022 (April 22, 2022): 1–21. http://dx.doi.org/10.1155/2022/1167025.

Full text

Abstract:

Based on a Wharf project in Chongqing, this paper carries out experimental research and nonlinear finite element analysis on the impact resistance of steel casing rock socketed pile of inland river frame Wharf under horizontal impact load. The results show that the impact force and its growth rate, the bending moment of concrete pile core, and the maximum lateral displacement of pile top increase significantly with the increase of impact energy, and the linear increase of the maximum displacement of pile top is better. Under the same impact energy, with the increase of impact mass, the maximum impact force decreases, the maximum bending moment of concrete pile core and its vibration center value (platform value) increase, and the maximum displacement of pile top and its vibration center value (platform value) increase. Based on the impact mass m threshold, the criterion of different dynamic response forms of pile body is proposed. The impact mass threshold corresponds to the development of plastic hinge at the root of pile body. Through the parametric analysis method, it is obtained that the impact mass, impact velocity, and the maximum displacement of pile top meet the parabolic spherical relationship.

APA, Harvard, Vancouver, ISO, and other styles

39

Seidel, J. P., and B. Collingwood. "A new socket roughness factor for prediction of rock socket shaft resistance." Canadian Geotechnical Journal 38, no. 1 (February 1, 2001): 138–53. http://dx.doi.org/10.1139/t00-083.

Full text

Abstract:

Prediction of rock socket shaft resistance is a complex problem. Conventional methods for predicting the peak shaft resistance are typically empirically related to unconfined compressive strength through the results of pile load tests. It is shown by reference to international pile socket databases that the degree of confidence which can be applied to these empirical methods is relatively low. Research at Monash University has been directed at understanding and then modelling the complex mechanisms of shear transfer at the interface between the socketed piles and the surrounding rock. Important factors that affect the strength of pile sockets have been identified in laboratory and numerical studies. With a knowledge of the effect of these factors, the reasons for the large scatter around traditional empirical correlations can be deduced. A computer program called ROCKET has been developed which encompasses all aspects of the Monash University rock socket research. This program has been used to develop design charts for rock-socketed piles based on unconfined compressive strength and a nondimensional factor which has been designated the shaft resistance coefficient (SRC). Implementation of the SRC method in design requires an estimate of the likely socket roughness to be made. Very few researchers or practitioners have measured socket roughness, so there is little available guidance in selection of appropriate values. Although many socket load tests are described in the technical literature, the physical parameter which is regularly missing is the socket roughness. With a knowledge of the shaft resistance, and an estimate of all other relevant parameters, the authors have been able to back-calculate the apparent socket roughness using the SRC method. Based on the back-calculated roughness data, socket roughness guidelines for use in analysis and design of rock sockets have been proposed. Using these roughness guidelines, it is shown that the SRC method is able to predict the scatter observed in previously published international load test databases.Key words: rock socket, drilled shaft, shaft resistance, roughness, shaft resistance coefficient.

APA, Harvard, Vancouver, ISO, and other styles

40

Lei, Gang, Panpan Guo, Fucai Hua, Xiaonan Gong, and Lina Luo. "Observed Performance and FEM-Based Parametric Analysis of a Top-Down Deep Excavation in Soil-Rock Composite Stratum." Geofluids 2021 (June 19, 2021): 1–17. http://dx.doi.org/10.1155/2021/6964940.

Full text

Abstract:

This paper investigates the performance of a top-down deep excavation in soil-rock composite stratum. The behavior of the excavation bracing system, consisting of ground anchors and end-suspended piles, has not been well understood due to the lack of relevant research. Based on the observed data of a typical deep excavation case history for the May Fourth Square Station in Tsingtao, China, the characteristics of the horizontal and vertical pile displacements, ground surface settlements, building settlements, axial forces in ground anchors, earth pressure, and pore water pressure during excavation were analysed. Two-dimensional finite element simulations were carried out to further explore the deformation and internal force responses of end-suspended piles and to capture the effects of pile diameter, embedded depth, and rock-socketed depth on the horizontal displacement and bending moment distributions along the pile shaft. It was found that the pattern of the vertical pile displacements could be categorized into three types: rapid settlement, slow settlement, and rapid heave. The magnitudes of the ground and building responses can be well controlled within allowable limits by combining the top-down method with the adopted bracing system. Among the investigated parameters, pile diameter is dominant in affecting the horizontal pile displacement. The primary influence zone for pile bending moment varies, depending on the parameters. It is recommended that a combination of top-down method, ground anchors, and end-suspended piles be adopted for restraining excavation deformation and lowering construction costs of similar deep excavations in soil-rock composite stratum.

APA, Harvard, Vancouver, ISO, and other styles

41

Huang, Bin, Yuting Zhang, Bu Lv, Zhijun Yang, Xudong Fu, and Benjiao Zhang. "Vertical bearing characteristics of rock-socketed pile in a synthetic soft rock." European Journal of Environmental and Civil Engineering 25, no. 1 (November 4, 2018): 132–51. http://dx.doi.org/10.1080/19648189.2018.1518793.

Full text

APA, Harvard, Vancouver, ISO, and other styles

42

Lu, Peng Zhen, Bin Bin Feng, and Li Zhao. "Construction Technology of 7 Meters Long Deep Rock-Socketed Pile." Applied Mechanics and Materials 353-356 (August 2013): 2791–94. http://dx.doi.org/10.4028/www.scientific.net/amm.353-356.2791.

Full text

Abstract:

In this article, authors introduce some aspects of construction of deep rock-embedded piles on steep slopes such as selection of construction programs, construction measures and matters need attention.

APA, Harvard, Vancouver, ISO, and other styles

43

Xing, Hao Feng, Ming Hui Meng, Wan Xue Long, Guan Bao Ye, and Wen Yong He. "Research on the Construction Technique of Super-Large Diameter Rock-Socketed Piles in Karst Areas." Advanced Materials Research 446-449 (January 2012): 1486–90. http://dx.doi.org/10.4028/www.scientific.net/amr.446-449.1486.

Full text

Abstract:

It is difficult for the large diameter pile to bore the hole and ensure its quality under the complicated geological condition in karst areas. In order to get the feasible construction method, the construction technique of super-large diameter rock-socketed piles in karst areas was explored in this paper on the basis of Hezhang Super Maior Bridge project in Guizhou province. The adaptability of the construction plan at this site was expounded firstly; and then the technologies for dealing with the problems of buried hammer, inclined hole, slurry leakage, which often occur during the process of boring pile hole under complicated geological conditions, were deeply researched. The research results show that it is effective to use the slurry with the relative density of 1.30 to 1.35 to prevent the pebble soil layer from collapsing, to prevent the pile hole from inclining by backfilling rubble in tilted stratum, to treat the slurry leakage problem by backfilling rubble, clay soil and bagged cement; and to handle the hammer stuck through the skills of underwater blasting, salvaging with pothook and light pounding with small hammer. It is proved that the method of light pounding with small hammer is preferable to handle the stuck hammer occured in backfill hole. The study provides the theoretical guidance and reference for similar projects.

APA, Harvard, Vancouver, ISO, and other styles

44

Zhang, Ben-jiao, Bin Huang, Can Mei, Xu-dong Fu, Gang Luo, and Zhi-jun Yang. "Dynamic Behaviours of a Single Soft Rock-Socketed Shaft Subjected to Axial Cyclic Loading." Advances in Materials Science and Engineering 2016 (2016): 1–9. http://dx.doi.org/10.1155/2016/7457086.

Full text

Abstract:

The soft rock was simulated by cement, plaster, sand, water, and concrete hardening accelerator in this paper. Meanwhile, uniaxial compressive strength tests and triaxial compression tests were conducted to study the mechanical properties of simulated soft rock samples. Model tests on a single pile socketed in simulated soft rock under axial cyclic loading were conducted by using a device which combined test apparatus with a GCTS dynamic triaxial system. Test results show that the optimal mix ratio is cement : plaster : medium sand : water : concrete hardening accelerator = 4.5% : 5.0% : 84.71% : 4.75% : 1.04%. The static load ratio (SLR), cyclic load ratio (CLR), and the number of cycles affect the accumulated deformation and cyclic secant modulus of the pile head. The accumulated deformation increases with increasing numbers of cycles. However, the cyclic secant modulus of pile head increases and then decreases with the growth in the number of cycles and finally remains stable after 50 cycles. According to the test results, the development of accumulated settlement was analysed. Finally, an empirical formula for accumulated settlement, considering the effects of the number of cycles, the static load ratio, the cyclic load ratio, and the uniaxial compressive strength, is proposed which can be used for feasibility studies or preliminary design of pile foundations on soft rock subjected to traffic loading.

APA, Harvard, Vancouver, ISO, and other styles

45

Liu, Ming-wei, Fang Fang, and Yue Liang. "Design method of large-diameter rock-socketed pile with steel casing." IOP Conference Series: Earth and Environmental Science 113 (February 2018): 012162. http://dx.doi.org/10.1088/1755-1315/113/1/012162.

Full text

APA, Harvard, Vancouver, ISO, and other styles

46

Bakri, Mudthir, Yuan You Xia, Chun Shu Chen, and Hua Bin Wang. "Evaluation of Pile Application for Slopes on Bedrock Stability." Applied Mechanics and Materials 744-746 (March 2015): 479–84. http://dx.doi.org/10.4028/www.scientific.net/amm.744-746.479.

Full text

Abstract:

This paper presents a numerical study that performs the stability of slopes on bedrock reinforced with single pile row at different locations. The slope is formed of top sliding soil layer that underlies over rock. The numerical analysis has been implemented by employing the three dimensional analysis using FLAC3D. The results indicate that as the pile location is moved towards the slope crest the displacement increases.In the single row of pile application, the factor of safety reached its maximum value when the pile located at the top middle of the slope. Considering the failure mode the results has conclude three failure modes; above, in front, and through the pile according to the location of the pile. Failure mode is also affected by socketed length of pile in bedrock layer. It is believed that the findings of this study contribute to the engineers performing slope stability analysis in practice.

APA, Harvard, Vancouver, ISO, and other styles

47

Muthukkumaran, K., and A. R. Prakash. "Behaviour of laterally loaded socketed pile in multi-layered soil-rock profile." Japanese Geotechnical Society Special Publication 3, no. 2 (2015): 51–55. http://dx.doi.org/10.3208/jgssp.v03.i07.

Full text

APA, Harvard, Vancouver, ISO, and other styles

48

Wei, Guo, Zhuang Daokun, Ren Yuxiao, Cui Wenxi, Yue Changxi, and Yu Changyi. "Model test study of bending moment and negative skin friction for batter rock-socketed piles under surface load." E3S Web of Conferences 283 (2021): 01039. http://dx.doi.org/10.1051/e3sconf/202128301039.

Full text

Abstract:

Batter rock-socketed piles (BRSP) foundation is one of common foundations, such as port engineering or cross-sea bridge, while there are few studies on negative skin friction for BRSP. A series of model tests are conducted to explore negative skin friction of BRSP which are embedded in thick soft clay. The effects of the inclined angle of piles and soil consolidation time to negative friction resistance and the bending moment of BRSP are analyzed. The test results show that: the development of negative friction and bending moment BRSP have pronounced time effect; the longer the consolidation time is, the slower the axial force and bending moment intensify. The ultimate pile shaft axial force and bending moment increases nonlinearly concerning the inclined angle of piles. And the “neutral point” position and peak point of bending moment is always located at 0.9~1.0 times soil depth.

APA, Harvard, Vancouver, ISO, and other styles

49

Choi, Younggyun, Janghwan Kim, and Heejung Youn. "Numerical Analysis of Laterally Loaded Piles Affected by Bedrock Depth." Advances in Civil Engineering 2018 (September 26, 2018): 1–9. http://dx.doi.org/10.1155/2018/5493579.

Full text

Abstract:

This study investigates the lateral behavior of pile foundations socketed into bedrocks using 3D finite difference analysis. The lateral load-displacement curve, pile deflection, and bending moment distribution were obtained for different bedrock depths between 3 and 20 m. It was discovered that bedrocks that have a depth of 7 m (7D) or less influence the lateral behavior of the pile. The p-y curves were collected at depths of 2.0–4.5 m, and the effect of the bedrock on the curves was evaluated. It was observed that the p-y curves were significantly affected by the material properties of the bedrock if the rock is located in close proximity (within 3D), but the effect is diminished if the p-y curves were 3.5 m (3.5D) or farther from the bedrock.

APA, Harvard, Vancouver, ISO, and other styles

50

Huang, Bin, Yuting Zhang, Xudong Fu, and Benjiao Zhang. "Study on Visualization and Failure Mode of Model Test of Rock-Socketed Pile in Soft Rock." Geotechnical Testing Journal 42, no. 6 (October 16, 2018): 20170348. http://dx.doi.org/10.1520/gtj20170348.

Full text

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'Rock-socketed pile'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles