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Journal articles on the topic 'Rock and Pillar Range'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Xu, Qingyun, Jian-Biao Bai, Shuai Yan, Rui Wang, and Shaoxu Wu. "Numerical Study on Soft Coal Pillar Stability in an Island Longwall Panel." Advances in Civil Engineering 2021 (January 29, 2021): 1–13. http://dx.doi.org/10.1155/2021/8831778.

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Roadway support and management of longwall panels in an island soft coal panel are always difficult work. In a test mine, stress distribution, deformation characteristic, and plastic zone distribution around the roadway and coal pillars in the development and mining periods were investigated with respect to the widths of different coal pillars using theoretical and simulation methods. The most reasonable width of coal pillars was comprehensively determined, and the field test was conducted successfully. The results show that a reasonable width of coal pillars is 7.0–8.2 m using the analytical

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2

Zhang, Ming, Chen Cao, and Bingjie Huo. "Ground Stress Distribution and Dynamic Pressure Development of Shallow Buried Coal Seam Underlying Adjacent Room Gobs." Shock and Vibration 2021 (August 6, 2021): 1–11. http://dx.doi.org/10.1155/2021/8812933.

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The condition of the coal pillars remained in the room-and-pillar gobs is complicated. The stresses loaded on the pillar floor may be transmitted and overlapped. It changes the stress environment of the lower coal seam roof, leading abnormal periodic weighting. In the procedure of coal seam 3−1 mining in the Huoluowan Coal Mine, the ground stress is high while the working face passing through the room pillars of overlying coal seam 2−2, leading to hydraulic shield being broken. In this paper, theoretical analysis, numerical calculation, and similar material simulation were used to analyse the

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3

Le Quang, Phuc, Vladimir Zubov, and Thang Pham Duc. "Design a Reasonable Width of Coal Pillar Using a Numerical Model. A case study of Khe Cham basin, Vietnam." E3S Web of Conferences 174 (2020): 01043. http://dx.doi.org/10.1051/e3sconf/202017401043.

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Problems in surrounding rock displacement, roadway deformation and complex support are the hallmarks of the long wall mining system. Such problems seriously affect the safety and efficient production of coal mines. To control the deformation of the rocks around the roadway next to the goaf, to reduce the support pressure, in Vietnamese underground mines often leave supporting coal pillars. Identification of a reasonable design for roadway supporting pillars by a numerical simulation study was conducted under the geological and technical foundation of I-10- 2 working faces at the Khe Cham coal

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4

Zhou, Zong Hong, Ke Peng Hou, and Feng Yu Ren. "Numerical Simulation of Ground Pressure Activity Caused by Orebody Mining under Road." Advanced Materials Research 462 (February 2012): 407–12. http://dx.doi.org/10.4028/www.scientific.net/amr.462.407.

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There is the Jinggu-Minle road to cross through the No. 3 ore clusters in Songjiapo copper mine. The surface ground deformation and strata movement caused by underground mining will threaten the road transportation safety, which doesn’t allow collapse. Using numerical simulation method, the ground pressure activity and deformation, movement mechanism of strata were analyzed under different mining methods. Moreover, some control measures such as reserving insulating pillar and point pillars were put forward to maintain the stability of mined-out areas and the surface road. An optimal mining sch

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Sun, Binyang, Pingsong Zhang, and Haifeng Lu. "Study on Reasonable Size of Coal and Rock Pillar in Dynamic Pressure Roadway Segment of Fully Mechanized Face in Deep Shaft." Advances in Civil Engineering 2020 (October 10, 2020): 1–10. http://dx.doi.org/10.1155/2020/8822175.

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The deformation mechanism of the protective coal and rock pillar area outside a stope is an important parameter for setting a reasonable size. In this paper, based on the geological condition of working face 1231(1) in a mine in Huainan, a method that combines the use of a borehole and Brillouin optical time domain reflectometry (BOTDR) was proposed to analyze the stress variation laws of coal and rock pillar areas, and the parameters of the monitoring borehole and installation technique of the sensing optical cables were designed. Based on the monitoring data, the strain distribution characte

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6

Zhang, Hai Bo, and Ya Jie Chen. "Study on the Mechanism of Backfill and Surrounding Rock of Open Stope during Subsequent Backfill Mining." Advanced Materials Research 753-755 (August 2013): 452–56. http://dx.doi.org/10.4028/www.scientific.net/amr.753-755.452.

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In order to analyze the mechanism of backfill and surrounding rock of open stope during subsequent backfill mining, take M1 ore body mining in a mine as engineering background, and simulate the mechanism of surrounding rock and backfill by using FLAC3D numerical software. Results show that the backfill can effectively alleviate or transfer the stress concentration state of the room floor and pillar, apparently restrain the displacement of the cavity plate and pillar, and improve the plasticity distribution range in a limited degree.

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7

Zhao, Shu Guo, Wei Dong Song, Wen Bin Xu, and Huan Hu Song. "Simulation Study on the Stability of Mining Thin Flat-Grade Iron Ore Body with Hydraulic Support Longwall Method." Applied Mechanics and Materials 170-173 (May 2012): 3706–10. http://dx.doi.org/10.4028/www.scientific.net/amm.170-173.3706.

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This paper proposed hydraulic support longwall method for mining glacis thin orebody. The DaZhuang ore section of Guandian Ore Mining whose orebody in the line of -8＇—-16＇was chosen as the research object. It applied the FLAC numerical simulation method to study the changes of surrounding rock stress in the mining face, displacement and plastic zones, and put forward the changing law of the rock stress, displacement and plastic zones in the mining process. Besides, it proved that the mechanical condition of the roofs changed in different stages. When the distance between pillar and mining face

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8

Jiang, Li-li, Zeng-qiang Yang, and Gang-wei Li. "Research on the Reasonable Coal Pillar Width and Surrounding Rock Supporting Optimization of Gob-Side Entry under Inclined Seam Condition." Advances in Civil Engineering 2021 (May 19, 2021): 1–13. http://dx.doi.org/10.1155/2021/7145821.

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In order to study the optimal coal pillar width and surrounding rock control mechanism of gob-side entry under inclined seam condition, the 130205 return air entry adjacent to 130203 gob in Yangchangwan No. 1 well is taken as a typical engineering background. By means of engineering background analysis, theoretical analysis based on inside and outside stress field, numerical simulation by FLAC3D software, and in situ industrial test and relevant monitoring methods, the optimal coal pillar width and surrounding rock control technology are obtained. The results show that the influence range of i

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9

He, Fulian, Zheng Zheng, Hengzhong Zhu, and Bo Yang. "Research on Failure Mechanism and Strengthening of Broken Roadway Affected by Upper Coal Pillar." Advances in Civil Engineering 2019 (April 1, 2019): 1–13. http://dx.doi.org/10.1155/2019/8132817.

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The principal stress difference is introduced as a new evaluation index in order to better understand the failure mechanism of roadways affected by upper coal pillars and characterize failure of rock mass. Compared with traditional methods, it facilitates quantitative analysis. Moreover, we combine the semiplane theory and we obtain the stress distribution on the coal pillar’s bedrock and the strengthening control area from the “change point” position along a 21 m horizontal line. The influence of multiple stresses induced from mining on a roadway is analyzed. It is found that rock failure is

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10

Skrzypkowski, Krzysztof. "Decreasing Mining Losses for the Room and Pillar Method by Replacing the Inter-Room Pillars by the Construction of Wooden Cribs Filled with Waste Rocks." Energies 13, no. 14 (2020): 3564. http://dx.doi.org/10.3390/en13143564.

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The article presents methods of securing mining excavations using wooden cribs. For the underground room and pillar method used to excavate zinc and lead ore body in the Olkusz-Pomorzany mine in Poland, model tests for the replacement of rock pillars by wooden cribs are presented. In the first stage of research, the results of laboratory strength tests carried out on models of four-point, six-point and eight-point cribs made of wooden beech beams at a 1:28 scale arranged horizontally were determined. For the first time, a concave round notch connection was used to connect the beams of the wood

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11

Skrzypkowski, Krzysztof. "The Influence of Room and Pillar Method Geometry on the Deposit Utilization Rate and Rock Bolt Load." Energies 12, no. 24 (2019): 4770. http://dx.doi.org/10.3390/en12244770.

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In this article, a model of ore deposit in form of a lense carried out in the MineScape program, is presented. The lense had a thickness of 30 m, length along the strike 200 m, and the depth buried was for 80 m to 110 m below the surface. In the first layer, counting from the lowest level, a room and pillar method with variable geometry was designed. The width and length dimensions for rooms and pillars were: 4 m, 5 m and 6 m, respectively. For the selected part of the deposit, three variants of the system with variable geometry of rooms and pillars were designed, for which the deposit utiliza

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12

Chen, Dongdong, Chunwei Ji, Shengrong Xie, et al. "Deviatoric Stress Evolution Laws and Control in Surrounding Rock of Soft Coal and Soft Roof Roadway under Intense Mining Conditions." Advances in Materials Science and Engineering 2020 (June 22, 2020): 1–18. http://dx.doi.org/10.1155/2020/5036092.

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Aiming at the problem of large deformation and instability failure and its control of soft coal and soft roof roadway under intense mining, laboratory experiments, theoretical calculations, Flac3D numerical simulation, borehole peeping, and pressure observation were used to study the deflection characteristics of the deviatoric stress of the gas tailgate and the distribution and failure characteristics of the plastic zone in the mining face considering the strain softening characteristics of the roof and coal of roadway, and then the truss anchor cable-control technology is proposed. The resul

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13

Skrzypkowski, Krzysztof, Waldemar Korzeniowski, Krzysztof Zagórski, and Anna Zagórska. "Adjustment of the Yielding System of Mechanical Rock Bolts for Room and Pillar Mining Method in Stratified Rock Mass." Energies 13, no. 8 (2020): 2082. http://dx.doi.org/10.3390/en13082082.

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The article presents a novel yielding mechanism, especially designed for the rock bolt support. Mechanical rock bolts with an expansion head and equipped with one, two, four and six dome bearing plates were tested in the laboratory conditions. Furthermore, in the Phase2D numerical program, five room and pillar widths were modeled. The main aim of numerical modeling was to determine the maximal range of the rock damage area and the total displacements in the expanded room. The models were made for a room and pillar method with a roof sag for copper ore deposits in the Legnica-Głogów Copper Dist

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14

Yang, Hengze, Zhongping Guo, Daozhi Chen, Chao Wang, Fuyu Zhang, and Zhaowen Du. "Study on Reasonable Roadway Position of Working Face under Strip Coal Pillar in Rock Burst Mine." Shock and Vibration 2020 (November 2, 2020): 1–21. http://dx.doi.org/10.1155/2020/8832791.

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It is of great significance to study the reasonable position of mining roadway under strip coal pillar for increasing the stability of mining roadway, reducing the waste of resources, and realizing the safety production of working face. Based on the research background of the working face under the strip coal pillar in Jinqiao Coal Mine of Jining, Shandong Province, through theoretical analysis, similar material simulation experiment, and numerical simulation experiment, the stress distribution law, plastic failure range, and rationality of coal pillar setting in different width sections are s

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15

Talbot, Joy M., A. F. Mark, and J. Bastow Wilson. "Vegetation-environment relations in snowbanks on the Rock and Pillar Range, Central Otago, New Zealand." New Zealand Journal of Botany 30, no. 3 (1992): 271–301. http://dx.doi.org/10.1080/0028825x.1992.10412908.

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16

Wu, Quansen, Peng Kong, Quanlin Wu, Xinggang Xu, Xingyu Wu, and Tao Guo. "Study on Overburden Rock Movement and Stress Distribution Characteristics under the Influence of a Normal Fault." Advances in Civil Engineering 2020 (September 19, 2020): 1–16. http://dx.doi.org/10.1155/2020/7859148.

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Fault activation triggers local deformation and dislocation, releasing a large amount of energy that can easily cause mining disasters, such as rock bursts and roadway instability. To study the changing characteristics of overburden structures and the evolution law of mining-induced stress as panel advances towards a fault from a footwall, two similar models were established, namely, a simulation experimental model and a numerical simulation model. In addition, the relationship among mining, mining stress, and rock bursts induced by fault activation was investigated. The results of this study

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17

Skrzypkowski, Korzeniowski, Zagórski, and Zagórska. "Flexibility and Load-Bearing Capacity of Roof Bolting as Functions of Mounting Depth and Hole Diameter." Energies 12, no. 19 (2019): 3754. http://dx.doi.org/10.3390/en12193754.

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This paper presents the results of laboratory tensile testing of segmentally-installed glue-in roof bolting. We studied roof bolting of the type Olkusz-16A (Boltech Sp. z o.o., ZGH Bolesław S.A., Bukowno, Poland), additionally equipped with a steel rod coil, which was mounted in steel cylinders filled with a concrete mixture using multi-part resin cartridges with a diameter of 0.024 m and length of 0.045 m. The mounting depths were 0.1 m and 0.2 m, respectively. Our main purpose was to determine the effect of the bolt hole diameter, which assumed the values 0.028 m, 0.032 m, 0.035 m, and 0.037

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18

Li, Genwei, Shuaifeng Lu, Sifei Liu, Jing Liu, Peng Shi, and Bowen Fan. "Application and Effect of Loading Rates on Coal Sample Failure." Shock and Vibration 2021 (March 17, 2021): 1–12. http://dx.doi.org/10.1155/2021/6681082.

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In order to evaluate the coal pillar stability in recovery of residual room pillars under different mining rates, this paper studies the influence of loading rate on the mechanical properties of the coal body. The uniaxial compression tests of coal samples in Yangcheng area at different loading rates were carried out with the MTS815 electrohydraulic servo rock mechanics test system. The stress-strain curves and the evolution characteristics of AE signals were analyzed. At same time, the mechanism of damage and failure of specimens are also discussed. The results show the following. (1) With th

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19

Derraik, José G. B., Barbara I. P. Barratt, Phil Sirvid, et al. "Invertebrate survey of a modified native shrubland, Brookdale Covenant, Rock and Pillar Range, Otago, New Zealand." New Zealand Journal of Zoology 28, no. 3 (2001): 273–90. http://dx.doi.org/10.1080/03014223.2001.9518270.

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20

Skrzypkowski, Krzysztof. "Case Studies of Rock Bolt Support Loads and Rock Mass Monitoring for the Room and Pillar Method in the Legnica-Głogów Copper District in Poland." Energies 13, no. 11 (2020): 2998. http://dx.doi.org/10.3390/en13112998.

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The article presents the impact of geological and mining factors on the stability of room excavations in the Legnica-Głogów Copper District (LGOM) in Poland. In underground mining, the primary task of bolting of mining excavations is to ensure their stability as an essential condition of work safety. Appreciating the role and importance of the rock bolting in Polish ore mining; rock bolt load sensors were designed, manufactured and tested under laboratory conditions. The purpose of the research was to characterize the sensors and determine the elastic range of the bearing plate, which are an i

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21

Gao, Baobin, Chuangnan Ren, Qun Dong, and Liwei Chen. "Study on Dynamic Behavior Law and Microseismic Monitoring in Stoping Process of Roadway with High Gas and Wide Coal Pillar." Shock and Vibration 2021 (June 25, 2021): 1–14. http://dx.doi.org/10.1155/2021/5135964.

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In order to study the dynamic characteristics and microseismic distribution in the mining process of roadway with high gas and wide coal pillar, combined with the two dynamic events of N2105 working face in Yuwu Coal Industry, theoretical analysis and field measurement research were carried out. According to the theory of structural mechanics and geomechanics, the causes of dynamic appearance are analyzed. Combined with the specific situation, the influence of mining depth, coal pillar width, gas pressure, and content on the dynamic performance is analyzed. Stress monitoring and microseismic m

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22

Grab, Stefan W., Katharine J. M. Dickinson, Alan F. Mark, and Tania Maegli. "Ploughing boulders on the Rock and Pillar Range, south‐central New Zealand: Their geomorphology and alpine plant associations." Journal of the Royal Society of New Zealand 38, no. 1 (2008): 51–70. http://dx.doi.org/10.1080/03014220809510546.

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23

Chen, Dongdong, En Wang, Shengrong Xie, et al. "Roadway Surrounding Rock under Multi-Coal-Seam Mining: Deviatoric Stress Evolution and Control Technology." Advances in Civil Engineering 2020 (November 23, 2020): 1–18. http://dx.doi.org/10.1155/2020/9891825.

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Multi-coal-seam mining creates surrounding rock control difficulties, because the mining of a coal face in one seam can affect coal faces in another. We examine the effects of multi-coal-seam mining on the evolution of the deviatoric stress distribution and plastic zone in the roadway surrounding rock. In particular, we use numerical simulation, theoretical calculation, drilling detection, and mine pressure observation to study the distribution and evolution characteristics of deviatoric stress on Tailgate 8709 in No. 11 coal seam in Jinhuagong mine when the N8707 and N8709 coal faces in No. 7

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Schmitt, Douglas R., Catherine Smither, and Thomas J. Ahrens. "In‐situ holographic elastic moduli measurements from boreholes." GEOPHYSICS 54, no. 4 (1989): 468–77. http://dx.doi.org/10.1190/1.1442673.

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We have developed a unique technique employing optical holography to measure the static Young’s modulus (E) from a borehole. In the experiment, a known point force induces micron scale displacements on the borehole wall which are recorded by a double‐exposure hologram. Raw data consist of dark fringes superimposed on the three‐dimensional image whose pattern is modeled to find E directly. In the laboratory, the holographic technique determined E on rock and metal samples to an uncertainty better than 10 percent. For example, double exposure holograms of a saw‐cut sample of dolomitic marlstone

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25

Mark, Alan F., Ulf Molau, Peter Whigham, Lorna Little, and Jacqueline Nielsen. "Periglacial tarn on the Rock and Pillar Range crest, south-central South Island, New Zealand, and its surrounding snowbank community." Austral Ecology 41, no. 3 (2015): 282–90. http://dx.doi.org/10.1111/aec.12310.

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26

Sadovenko, I., V. Bondarenko, I. Salieiev, and A. Zagrytsenko. "Substantination of hydromechanical parameters of water regulation using mine pillars during mines closure." Collection of Research Papers of the National Mining University 64 (2021): 55–67. http://dx.doi.org/10.33271/crpnmu/64.055.

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Purpose. Substantiation of hydromechanical parameters that make it possible to control the safe ratio of hydrodynamic levels in a mine shaft and a rock mass when closing mines using submersible pumps. Research methodology. An experimental-analytical method was used, which consists in the formation and analysis of data from field tests of fractured porosity, permeability and the position of groundwater levels in hard sandstones around mine shafts with concrete support. Research results. It has been established that the hydromechanical state around a mine shaft in stable water-bearing rocks is c

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Jia, Housheng, Luyao Wang, Kai Fan, Bo Peng, and Kun Pan. "Control Technology of Soft Rock Floor in Mining Roadway with Coal Pillar Protection: A case study." Energies 12, no. 15 (2019): 3009. http://dx.doi.org/10.3390/en12153009.

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This study considered the mining roadway with coal pillar protection in the fully mechanized caving face of the Dananhu No.1 Coal Mine, China. Theoretical analysis, numerical simulation, and field tests were conducted, and the stress environment, deformation, and failure characteristics of the mining roadway in the fully mechanized caving face were analyzed. The results revealed that the intrinsic cause for the large asymmetrical floor deformation in the mining roadway is the asymmetrical phenomenon of the surrounding rock’s stress environment, caused by mining. This also results in the non-un

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Liu, Xudong, Wenlong Shen, Jianbiao Bai, Rui Wang, Jizhong Kang, and Xiangyu Wang. "Mining-Induced Redistribution of the Abnormal Stress under the Close Bearing Coal Pillar for Entry Design." Advances in Civil Engineering 2021 (April 8, 2021): 1–13. http://dx.doi.org/10.1155/2021/5595372.

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Underground space is vulnerable to large deformation influenced by the abnormal stress induced by the bearing coal pillar. A numerical simulation model was established to determine the redistribution of the abnormal stress induced by the mining activities. The double-yield model, the strain softening model, the interface model, and the Mohr–Coulomb model were determined to simulate the gob compaction effect, the pillar strength reduction effect, the structure plane discontinuity effect, and the rock mechanical behavior, respectively. This numerical simulation model is reliable to predict the a

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Cui, Feng, Chong Jia, Xingping Lai, Yanbing Yang, and Shuai Dong. "Study on the Law of Fracture Evolution under Repeated Mining of Close-Distance Coal Seams." Energies 13, no. 22 (2020): 6064. http://dx.doi.org/10.3390/en13226064.

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The western region of China is rich in mineral resources. The vigorous development of mineral resources has exacerbated the environmental and safety problems in the region. One of the important links to solve this problem is to control the development laws and distribution characteristics of the overburdened cracks in the mining of this area. In this paper, the Xiashijie coal mine 3-2 coal seam and 4-2 coal seam are examples of repeated mining, and are examined as the background, through theoretical analysis to optimize the size of the coal pillars in the lower section, using the 3DEC numerica

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Li, Lifeng, Gan Li, Weili Gong, Jiong Wang, and Huilin Deng. "Energy Evolution Pattern and Roof Control Strategy in Non-Pillar Mining Method of Goaf-Side Entry Retaining by Roof Cutting—A Case Study." Sustainability 11, no. 24 (2019): 7029. http://dx.doi.org/10.3390/su11247029.

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This article focuses on the energy density alteration during non-pillar mining method of goaf-side entry retaining by roof cutting (GERRC) and adjacent working face mining. We also studied the support control strategy of goaf-side roadway. Numerical calculation model is established, and the parameters of the model are verified by the measured advance abutment pressure and numerical solution. Based on the numerical model, the energy density during mining is studied. It is found that the whole energy evolution pattern of the goaf side entry during the two adjacent working face mining includes: t

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Zhang, Buchu, Dequan Sun, and Ruiliang Zheng. "Evolution Law of Coal Seam Abutment Pressure under the Influence of Shallow Buried Complex Strata: A Case Study." Shock and Vibration 2021 (March 15, 2021): 1–13. http://dx.doi.org/10.1155/2021/6670175.

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The evolution law of lateral abutment pressure under the condition of fully mechanized mining in shallow coal seam is studied using the change process of coal pillar stress in disturbed section as the research object. The results of physical simulation experiment show that, after coal mining, due to the collapse of coal seam roof, the overlying strata of key layer will disturb the section coal pillar to different degrees, and the sudden change of degrees of abutment pressure near the coal wall reaches the maximum. Affected by the energy released by the fracture of key stratum, the stress mutat

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Jiang, Pengfei, Peng Xiao, Fanbao Meng, et al. "Application Study on Active Advanced Support Technology in Deep Roadway under Mine Goaf." Geofluids 2020 (November 24, 2020): 1–13. http://dx.doi.org/10.1155/2020/8865238.

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To solve the problems of the rapid advance of the working face was delayed by complicated working procedure and high labor intensity, and the severe damage of roof bolt (anchor cable) induced by advanced hydraulic support, the deformation characteristics of surrounding rock, and the supporting principle of grouting truss anchor cable were analyzed theoretically by taking the roadway of 3_(down) coal seams 2326# working face in Sanhekou coal mine as the research object; then, the mechanical model of supporting structure of roadway under goaf was established. Based on this model, the optimal sup

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Geng, Jiabo, Qihang Li, Xiaoshuang Li, Tao Zhou, Zhifang Liu, and Yulin Xie. "Research on the Evolution Characteristics of Rock Mass Response from Open-Pit to Underground Mining." Advances in Materials Science and Engineering 2021 (August 9, 2021): 1–15. http://dx.doi.org/10.1155/2021/3200906.

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This study is based on the engineering background of pit no. 2 in Jinning Phosphate Mine, China. In order to systematically analyze the movement, deformation, and failure laws of surrounding rocks in underground stopes. The room and pillar method is used to excavate and stop the ore bodies in the mining area. Combined with the similar physical model experiments and discrete element MatDEM numerical simulations, it reveals the deformation and failure laws and evolution characteristics of the surrounding rock of the stope in the process of converting from open-pit to underground mining. The resu

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Guo, Xiaofei, Yongen Li, Guangdong Zhou, Zengji He, Haoran Yu, and Yichang Xu. "Stability Analysis and Reasonable Layout of Floor Drainage Roadway above Confined Water and under Mining Influence." Geofluids 2021 (March 12, 2021): 1–11. http://dx.doi.org/10.1155/2021/5578717.

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The surrounding rock failure range of floor drainage roadway under the mining influence and its effect on the aquiclude are the key to determine the aquiclude thickness of the floor. This paper studied the distribution characteristics of the surrounding rock plastic zone by the numerical simulation when the floor drainage roadway was located at different positions under the working face and determined the rational position. Results show that (1) when the floor drainage roadway is staggered inward, the floor surrounding rock is prone to appear the butterfly plastic zone under single work face m

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SOKOLOV, Igor, Yury ANTIPIN, and Artem ROZHKOV. "MODERNIZATION OF THE MINING SYSTEM OF SMALL DEPOSITS OF RICH COPPER PYRITE ORES." Sustainable Development of Mountain Territories 12, no. 3 (2020): 444–53. http://dx.doi.org/10.21177/1998-4502-2020-12-3-444-453.

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The purpose work. Substantiation and selection of a safe and effective option of mining technology of the experimental block in the pilot industrial mining of the Skalistoe deposit. Method of research. Analysis and synthesis of project solutions, experience in mining inclined low-thickness ore bodies, economic and mathematical modeling and optimization of the parameters of options mining systems in the conditions of the experimental block. Results of research. As a result of research it was established: - the sublevel caving mining system with the parameters adopted in the project does not gua

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d’Obyrn, Kajetan, and Joanna Hydzik-Wiśniewska. "Assessment of Rock Mass Stability in the Historic Area of Levels IV-V of the “Wieliczka” Salt Mine." Archives of Mining Sciences 62, no. 1 (2017): 189–202. http://dx.doi.org/10.1515/amsc-2017-0014.

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Abstract As a result, of more than 700 years of exploitation in the Wieliczka Salt Mine, a network of underground workings spreading over eleven levels was created. All mine workings of significant historic and natural qualities and the majority of functional mine workings designated to be preserved are located on levels I to V. The most precious of them, available to tourists, are located in the central part of the Mine on levels I-III. The Mine is not anticipating to make levels IV, Kołobrzeg and V available for a wider range of visitors, even though there are historically and naturally prec

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King, T. M., G. P. Wallis, S. A. Hamilton, and J. R. Fraser. "Identification of a hybrid zone between distinctive colour variants of the alpine weta Hemideina maori (Orthoptera: Stenopelmatidae) on the Rock and Pillar range, southern New Zealand." Molecular Ecology 5, no. 4 (1996): 583–87. http://dx.doi.org/10.1046/j.1365-294x.1996.00118.x.

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KING, T. M., G. P. WALLIS, S. A. HAMILTON, and J. R. FRASER. "Identification of a hybrid zone between distinctive colour variants of the alpine weta Hemideina maori (Orthoptera: Stenopelmatidae) on the Rock and Pillar range, southern New Zealand." Molecular Ecology 5, no. 4 (1996): 583–87. http://dx.doi.org/10.1111/j.1365-294x.1996.tb00350.x.

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CHAPPLE, DAVID G., TRENT P. BELL, STEPHANIE N. J. CHAPPLE, KIMBERLY A. MILLER, CHARLES H. DAUGHERTY, and GEOFF B. PATTERSON. "Phylogeography and taxonomic revision of the New Zealand cryptic skink (Oligosoma inconspicuum; Reptilia: Scincidae) species complex." Zootaxa 2782, no. 1 (2011): 1. http://dx.doi.org/10.11646/zootaxa.2782.1.1.

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The New Zealand skink fauna is highly diverse and contains numerous cryptic, undescribed or hitherto undiscovered species. We completed a taxonomic revision of the cryptic skink (Oligosoma inconspicuum) species complex using molecular (550 bp of the ND2 mitochondrial gene) and morphological analyses. Four new species are described, with each diagnosable by a range of morphological characters and genetic differentiation from several closely related species: O. inconspicuum (sensu stricto), O. notosaurus, O. maccanni, O. stenotis and O. grande. Oligosoma tekakahu sp. nov. is restricted to Chalky

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Wang, Yajun, Haosen Wang, Manchao He, Qi Wang, Yafei Qiao, and Jun Yang. "Mine Pressure Behavior Characteristics and Control Methods of a Reused Entry that Was Formed by Roof Cutting: A Case Study." Shock and Vibration 2020 (February 27, 2020): 1–15. http://dx.doi.org/10.1155/2020/4276730.

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Noncoal pillar mining with automatic formation of a roadway is a new coal mining method that is tailored to improve the coal resource recovery rate and reduce the investment in roadway tunneling. Using this proposed method, a reuse entry is formed by roof cutting instead of tunneling. In this paper, the S1201-II working face of the Ningtiaota Coal Mine was used as a case study. The stress distribution of surrounding rock and the roof deformation characteristics of the reused entry during the mining process of the second working face were studied through FLAC3D numerical simulations combined wi

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Pearson, D. J., and J. E. Kinnear. "A Review of The Distribution, Status and Conservation of Rock-wallabies in Western Australia." Australian Mammalogy 19, no. 2 (1996): 137. http://dx.doi.org/10.1071/am97137.

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Western Australia has five species of rock-wallabies. Petrogale brachyotis, Petrogale burbidgei and Petrogale concinna occur in wet-dry tropical habitats in the Kimberley region. Petrogale rothschildi is a Pilbara region endemic, while Petrogale lateralis has the largest distribution, extending from the south-west Kimberley to islands off the southern coastline. There have been few collections of the three species restricted to the Kimberley. Their small size, secretive disposition and variable pelage have hampered field identification, and thus, understanding of their distribution and status.

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Wang, Hong-Sheng, Hai-Qing Shuang, Lei Li, and Shuang-Shuang Xiao. "The Stability Factors’ Sensitivity Analysis of Key Rock B and Its Engineering Application of Gob-Side Entry Driving in Fully-Mechanized Caving Faces." Advances in Civil Engineering 2021 (May 24, 2021): 1–11. http://dx.doi.org/10.1155/2021/9963450.

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To reveal the critical factors of the main roof influencing stability of surrounding rocks of roadways driven along goaf in fully-mechanized top-coal caving faces, this paper builds a structural mechanics model for the surrounding rocks based on geological conditions of the 8105 fully-mechanized caving face of Yanjiahe Coal Mine, and the stress and equilibrium conditions of the key rock block B are analyzed, and focus is on analyzing rules of the key rock block B influencing stability of roadways driven along goaf. Then, the orthogonal experiment and the range method are used to confirm the se

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D’Obyrn, Kajetan, and Antoni Tajduś. "Geomechanical Numerical Analysis as a Guidance for Preservation Works of the “Wieliczka” Salt Mine Site." Studia Geotechnica et Mechanica 39, no. 2 (2017): 25–34. http://dx.doi.org/10.1515/sgem-2017-0013.

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Abstract Salt was excavated at the “Wieliczka” Salt Mine for over 700 years. Underground mining operations terminated in 1996, by which time almost 2,400 chambers and 245 km of galleries had been created underground, situated on 9 levels and a few interlevels. In 1978, the mine was included in the UNESCO World Heritage List, which stated that parts of the mine with historical value had to be preserved for future generations. In order to preserve the most valuable chambers and galleries, activities aimed at establishing a protection pillar for excavations were conducted in the conservation area

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Barratt, B. I. P., and G. Kuschel. "Broad‐nosed weevils (Curculionidae: Brachycerinae: Entimini) of the Lammermoor and Rock and Pillar Ranges in Otago, with descriptions of four new species ofIrenimus." New Zealand Journal of Zoology 23, no. 4 (1996): 359–74. http://dx.doi.org/10.1080/03014223.1996.9518096.

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Deng, D. Q., N. Jiang, and Y. Duan. "Sampling and Mechanical Testing of Backfill in Large Mined-Out Area." Geofluids 2021 (January 29, 2021): 1–8. http://dx.doi.org/10.1155/2021/6686385.

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To investigate the physicomechanical properties of stope backfill and to explore the mining conditions for an adjacent pillar, four boreholes, namely, GZK1, GZK2, GZK3, and GZK4, were constructed for taking the backfill core in the test stope. During borehole sampling, it is found that the strength of backfill is usually lower than that of the rock and ordinary concrete, and its resistance to tensile and compressive loads is limited. Therefore, the drilling speed should not be too fast, and a small amount of water is needed to continue drilling smoothly. For backfill with high strength, the sa

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Duan, Hongfei, and Lijuan Zhao. "Prevention Technology for Strong Mine Pressure Disaster in the Hard-Roof Large-Mining-Height Working Face." Shock and Vibration 2020 (October 21, 2020): 1–15. http://dx.doi.org/10.1155/2020/8846624.

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The movement and destruction of the hard roof in a stope is an important reason for the occurrence of strong ground pressure disasters at the working face. Considering Tongxin Coal Mine as the engineering background, the stress distribution law of the surrounding rock and the overburden rock damage characteristics of a large-mining-height working face under the hard roof were investigated. To solve the problem whereby the stope’s hard roof is difficult to collapse, the hard rock key stratum of the roof was hydraulically fractured to weaken the mechanical properties of the roof rock stratum. Ad

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Li, Yizhe, Shankun Zhao, Qingxin Qi, et al. "Mechanism of Coal Bump among Mine Group under the Control of Large Geological Body: A Case Study of Yima Mining Area, China." Advances in Civil Engineering 2021 (July 7, 2021): 1–12. http://dx.doi.org/10.1155/2021/8890651.

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Coal bump often occurs in coal mining among many working faces in mine group under the control of large geological bodies. In order to study the coal bump mechanism between adjacent working faces under the conditions of large fault and huge thick overburden conglomerate, this paper regards Yima mining area as a practical engineering background and theoretically analyzes the mechanical behavior of overlying rock in the spatial structure. Then, the deep-ground and whole-space measurement is carried out in the 13230 working face of Gengcun mine and 21121 working face of Qianqiu mine. The results

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Yang, Yongkang, Yanrong Ma, Chunxu Ji, Tianhe Kang, and Xingyun Guo. "Effect of Mining Thickness on Overburden Movement and Underground Pressure Characteristics for Extrathick Coal Seam by Sublevel Caving with High Bottom Cutting Height." Advances in Civil Engineering 2018 (November 25, 2018): 1–15. http://dx.doi.org/10.1155/2018/6871820.

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Because the coal seam is particularly thick and the mining intensity is large, the mining of extremely thick coal seams often causes a wide range of disturbed fractures, which in turn induces the phenomenon of strong underground pressure such as induced support crushing and water inrush. Through theoretical analysis, laboratory similarity simulation test, and other methods, this paper studies the effect of mining thickness on overburden movement and underground pressure characteristics for extremely thick coal seams by sublevel caving with high bottom cutting height. Some conclusions can be dr

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Zhu, Daoyong, Weili Gong, Yi Su, and Aipeng Guo. "Application of High-Strength Lightweight Concrete in Gob-Side Entry Retaining in Inclined Coal Seam." Advances in Materials Science and Engineering 2020 (January 22, 2020): 1–20. http://dx.doi.org/10.1155/2020/8167038.

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Gob-side entry retaining (GSER) is a popular no-pillar mining technology that can increase coal recovery rate. We propose the application of high-strength lightweight (HSLW) concrete to construct the gob-side support body (GSSB) in NO. 411 inclined working face of Jingang Coal Mine. Firstly, the mechanical model of retained roadway was established, and the calculation for limit angle of GSSB stability and support resistance was mathematically derived. Using the performance test, the optimal proportion of LC50 concrete was determined as follows: the water-binder ratio was 0.3; the silica fume d

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Yu, Bin, Yang Tai, Rui Gao, QiangLing Yao, Zhao Li, and Hongchun Xia. "The sustainable development of coal mines by new cutting roof technology." Royal Society Open Science 7, no. 6 (2020): 191913. http://dx.doi.org/10.1098/rsos.191913.

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China consumes more than 3.6 billion tons of coal every year. In the meanwhile, coal accounts for over 60% of the energy consumption sector. Therefore, the sustainable development of coal mines is a problem that needed to be solved by the Chinese government. During the coal resources recovery process, the protective coal pillars between the adjacent working faces lead to a vast waste of coal resources. In order to mitigate the resource-wasting issue, a new technology of roof cutting with chain arm retaining roadway was put forward in this paper. First, the procedures of retaining roadway, roof

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