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Добірка наукової літератури з теми "GEOTEXTILE REINFORCED SUBGRADE"

Автор: Grafiati

Опубліковано: 26 жовтня 2023

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Статті в журналах з теми "GEOTEXTILE REINFORCED SUBGRADE"

Öztürk, Mitat, Yakup Önal, Gökhan Altay, Ebubekir Kaplan, and Cafer Kayadelen. "Experimental evaluation of the usability of palm tree pruning waste (PTPW) as an alternative to geotextile." Revista de la construcción 21, no. 1 (2022): 69–82. http://dx.doi.org/10.7764/rdlc.21.1.69.

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This paper focuses on serving twofold benefits for the environment by providing not only recycling of a waste material but also improving rutting performance of sand subgrade under cyclic traffic loads. In this context, a series of laboratory experiments have been conducted to benchmark the performance of commercially manufactured geotextile and palm tree pruning waste (PTPW) as soil improvement agents. Experimental results of the study were evaluated based on permanent (plastic), total, and elastic deformation, rut depth reduction (RDR), traffic benefit ratio (TBR), percentage of elastic deformation, and resilient modulus (MR). In the view of experimental results, geotextile and PTPW-reinforced sand subgrades demonstrated well performance in the sense of permanent and elastic deformations when compared to unreinforced case. It is also realized that the most satisfactory performance was obtained when geotextile or PTPW are located at a burial depth of both 50 mm and 100 mm. In that case, TBR values of geotextile and PTPW-reinforced subgrades were almost the same at 20 mm permanent deformation (i.e., 6.71 and 6.76, respectively). Furthermore, when the results were evaluated based on RDR, it is observed that geotextile and PTPW reinforcements reduced the rut depth at the rate of 49.31 % and 37.15 % at the end of 5000 load cycle, respectively.

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Petrenko, V. D., O. L. Tiutkin, I. O. Sviatko, and A. M. M. Alhdur. "COMPLEX ANALYSIS OF SUBGRADE STRESS-STRAIN STATE WITH COMBINED STRENGTHENING." ACADEMIC JOURNAL Series: Industrial Machine Building, Civil Engineering 1, no. 48 (March 27, 2017): 165–74. http://dx.doi.org/10.26906/znp.2017.48.790.

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The paper highlights combined techniques of strengthening that include geotextile laying as well as other related advanced technologies. Subgrade construction analysis and its modification, reinforced with the different types and options of combined strengthening were conducted. To justify strengthening of subgrade a series of numerical calculations were made. Simulation with software package SCAD has confirmed the experimental results. From obtained results one can conclude that minimum horizontal displacements are observed in the version with deepening of geotextile at 1m and vertical ones at 0.4 m. Based on simulation results it is possible to make recommendations concerning modernization of existing subgrade and construction of new one in complex engineering-geological conditions

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Nishigata, Tatsuaki, and Ichizou Yamaoka. "Bearing capacity of soft subgrade reinforced by geotextile." Proceedings of geotextile symposium 2 (1987): 101–6. http://dx.doi.org/10.5030/jcigsjournal1986.2.101.

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Al-Refeai, Talal O. "Behavior of Geotextile Reinforced Sand on Weak Subgrade." Journal of King Saud University - Engineering Sciences 12, no. 2 (2000): 219–32. http://dx.doi.org/10.1016/s1018-3639(18)30715-3.

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Bayomy, Fouad M., Abdul-Karim M. Al-Shaikh, and Sahl N. Abduljauwad. "Effect of Geotextiles on Permanent Deformation in Salt-Encrusted Subgrade Soils." Transportation Research Record: Journal of the Transportation Research Board 1534, no. 1 (January 1996): 40–49. http://dx.doi.org/10.1177/0361198196153400107.

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The effectiveness of using geotextiles on top of salt-encrusted soil, known as sabkha in the Arabian Gulf area, used as a subgrade layer was investigated. A specific characteristic of this soil is that when it is dry (at or below the optimum moisture content) it possesses a sufficient bearing capacity and is hard enough to resist permanent deformation. However, when saturated it loses its strength and causes very large pavement deformations. An experimental model was developed in the laboratory to test and evaluate the bearing capacity and resistance to permanent deformation of the soil–fabric-reinforced system. The laboratory model consists of a cylindrical mold 320 mm in diameter and 420 mm in height in which a sabkha subgrade and a granular base are compacted and separated by a nonwoven geotextile. The testing variables considered in the study are thickness of the base layer on top of the sabkha sub-grade, the presence and types of geotextiles, the applied dynamic stress, and the moisture condition of the soil (at optimum dry versus saturated). The results indicate that the use of geotextiles significantly improved the bearing capacity and resistance to permanent deformation of the base layer on top of a sabkha subgrade. The improvement achieved is more significant for saturated conditions and is a function of the tensile strength of the geotextile. Increasing the base thickness resulted in higher levels of resistance to permanent deformation. A generalized linear regression model was developed to evaluate the permanent deformation of the soil–fabric–aggregate systems. The model is laboratory based, and its validity is restricted to the conditions investigated.

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Yin, Zihong, Kevin Maraka Ndiema, Raymond Leiren Lekalpure, and Clement Kiprotich Kiptum. "Numerical Study of Geotextile-Reinforced Flexible Pavement Overlying Low-Strength Subgrade." Applied Sciences 12, no. 20 (October 13, 2022): 10325. http://dx.doi.org/10.3390/app122010325.

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Construction of low-volume flexible pavements on low-strength subgrade poses design, construction, and maintenance challenges. While researchers have generally acknowledged the potential for geosynthetics as reinforcement material, they mainly focused on permanent deformation. Therefore, this paper presents a numerical study of low-volume flexible pavement reinforced with geotextile material under static loading to determine the improvement due to reinforcement based on three criteria: rutting performance, geosynthetic placement location, and base course thickness reduction. Based on the Finite Element Method (FEM), three-dimensional modeling using Abaqus/CAE software was performed. From the study, a significant decrease in rutting of up to 25.2% for the unreinforced pavement system was attained with geotextile reinforcement at base–subgrade and AC–base interfaces. The deflection response behavior of the pavement system is affected by the elastic modulus of the geosynthetic material, placement location, and the number of reinforcement layers. As a result of reinforcement, a base course thickness reduction of up to 30% was achieved without sacrificing the pavement’s structural integrity.

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Wright, Jason, S. Sonny Kim, Mi G. Chorzepa, and Stephan A. Durham. "Utilization of Large-Scale Rolling-Wheel Tester to Investigate the Stress Reduction in Pavement Layers Due to the Use of Geosynthetic Materials." Transportation Research Record: Journal of the Transportation Research Board 2673, no. 2 (February 2019): 445–55. http://dx.doi.org/10.1177/0361198119827909.

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Анотація:

In a geosynthetic-reinforced pavement system, the load-bearing capacity of subgrade soil is improved by the lateral distribution of vertical stresses at the reinforcing layer. Under small-scale triaxial testing, the tensile properties of the geosynthetic are difficult to measure. Therefore, it is desirable to conduct large-scale testing to accurately monitor the behavior of geosynthetic-reinforced pavement foundations when subjected to rolling-wheel loadings. This study investigates the behavior of geosynthetic-reinforced pavement foundation systems through large-scale rolling-wheel tests performed with problematic subgrade soils found in north Georgia. Sixteen large-scale specimens were constructed of which twelve were reinforced with geosynthetic. Subgrade soils were compacted either at their optimum moisture content or at a higher than optimum moisture content to produce different California Bearing Ratios during specimen preparation. Both an extruded biaxial geogrid and woven geotextile were placed at various locations to investigate the optimal placement locations for different subgrade conditions. Pressure sensors were installed near the bottom of the aggregate base layer and near the top of the subgrade layer to monitor the variations in vertical stress within the pavement system under rolling-wheel load. Further, light weight deflectometer measurements were collected post-test to determine the effect of the geosynthetic on pavement foundation stiffness. The vertical pressure at the bottom of the aggregate base and top of subgrade decreased on average approximately 15.3% and 18.8%, respectively. The results indicate which type of geosynthetic and placement location provides the greatest reduction of pressure for each of the given subgrade conditions.

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Nishigata, Tatsuaki, and Ichizou Yamaoka. "Bearing Capacity of Soft Subgrade and Subbase Layer Reinforced by Geotextile." Soils and Foundations 30, no. 2 (June 1990): 179–87. http://dx.doi.org/10.3208/sandf1972.30.2_179.

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., S. Siva Gowri Prasad. "STABILIZATION OF PAVEMENT SUBGRADE BY USING FLY ASH REINFORCED WITH GEOTEXTILE." International Journal of Research in Engineering and Technology 03, no. 08 (August 25, 2014): 255–59. http://dx.doi.org/10.15623/ijret.2014.0308040.

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Singh, Maninder, Sachin Kamboj, Kunal Jain, and S. K. Singh. "Effect on CBR Values with Addition of Coir Geotextile and Marble Dust in Silty Sands." IOP Conference Series: Earth and Environmental Science 889, no. 1 (November 1, 2021): 012005. http://dx.doi.org/10.1088/1755-1315/889/1/012005.

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Анотація:

Abstract The subgrade is the foundation of pavement. The conventional method of replacing weak soil with good soil can cause an increase in the cost of a project. Due to this reason ground improvement techniques are much popular nowadays. The major goal of this research work is to compare California Bearing Ratio (CBR) values of the virgin soil and soil reinforced with coir geotextile in one layer and a combination of two layers at different heights from the top surface of the soil. To see the change in CBR values one layer of coir geotextile was reinforced at three different heights (i.e., H/3; H/2 and 2H/3). After that, the effect on CBR values by reinforcement of combination of two layers of coir geotextile at different heights (i.e., H/3 and H/2; H/2 and 2H/3; and H/3 and 2H/3) from the top surface of the soil was studied. Thereafter, the soil is replaced by various percentages of marble dust ranging from 10% to 25% with an increment of 5% and again CBR values of soil samples reinforced with one layer of coir geotextile and a combination of two layers of geotextile at three different heights were compared with virgin soil. The test results reviewed that the maximum dry density (MDD) decreased and optimum moisture content (OMC) increased with the replacement of marble dust in the soil. The CBR test results specify an enhancement of the value of CBR with the addition of coir geotextile and marble dust. The maximum value of CBR is obtained when one layer of coir geotextile was introduced at the height of H/3 and in the case of a combination of two layers of coir geotextile maximum CBR values is obtained when the coir geotextile was introduced at a height of H/3 and 2H/3 from the top surface of the soil.

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Дисертації з теми "GEOTEXTILE REINFORCED SUBGRADE"

KUMAR, PRADEEP. "STRENGTH ANALYSIS OF GEOTEXTILE REINFORCED SUBGRADE." Thesis, 2023. http://dspace.dtu.ac.in:8080/jspui/handle/repository/19853.

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Geotextiles are an excellent solution for reinforcing subgrades in road projects, as they effectively address the common challenge of poor subgrade strength. In this comparative study, the strengths of subgrades reinforced with jute textile and polypropylene (PP) geotextile are investigated. The direct shear test (DST) and California bearing ratio (CBR) tests are conducted on both reinforced and non-reinforced soil samples. The positioning of geotextiles is crucial to the overall strength of the subgrade. The test results reveal that jute textile, a natural fibre, increases the shear strength of the soil samples. Conversely, the shear strength of the soil decreases when reinforced with polypropylene geotextile, a synthetic fiber. The study explores the placement depths of D/2, D/3, and D/4 from the top surface for the geotextile. For the CBR test, a single, double, and triple layer of geotextile is used to reinforce the soil samples. The double layer reinforcement at depths D/3 and D/4 demonstrates optimal strength. The focus of the study is on cohesionless pavement geomaterial reinforced with multi-layers of jute fibers. The research aims to evaluate the strength and stiffness capacity of the pavement geomaterial using the CBR test. The study optimizes the embedment depth of jute fiber at D/2, D/3, and D/4 in single, double, and triple layers based on CBR values. A novel concept of stiffness capacity, along with the penetration factor, is introduced to assess the strength of unreinforced and jute-reinforced geomaterial. The test results indicate that incorporating jute fibre in single, double, and triple layers increases the stiffness capacity of the soil at the optimum depth of D/4.The stiffness capacity varies from 0.378 to 0.682 at the maximum penetration factor, representing an 80.42% enhancement in the strength of pavement geomaterial. The findings of this study offer a cost effective solution for improving the strength of cohesionless soils in embankment, subgrade, and pavement construction technologies.

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Частини книг з теми "GEOTEXTILE REINFORCED SUBGRADE"

Adigopula, Vinod Kumar, Chandra Bogireddy, Sunny Deol Guzzarlapudi, Radha Gonawala, and Rakesh Kumar. "Mechanistic Analysis of Subgrade Soil Reinforced with Modified Jute Geotextile." In Sustainable Civil Infrastructures, 164–78. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-95771-5_14.

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