Goaf Gas Control Improvement by Optimizing the Adjacent Roadway Large-Diameter Boreholes by Wei Wang, Zongxiang Li, Hongming Yu

“…Using the 2-105 working face of the Tenghui Coal Mine, Shanxi Province, China, as a case study, the distribution patterns of gas concentration and flow field in the goaf for various extraction flow parameters and different positions of boreholes were numerically simulated. …”
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Study on Damage Model and Damage Evolution Characteristics of Backfill with Prefabricated Fracture under Seepage-Stress Coupling by Jifeng Hou, Zhongping Guo, Weizhen Liu, Hengze Yang, WenWu Xie

“…The research results can provide a theoretical basis for the study of the stability of backfill with geological defects such as joints and fractures in deep high-stress and high-seepage water pressure coal mines.…”
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A Gas Seepage Modeling Study for Mitigating Gas Accumulation Risk in Upper Protective Coal Seam Mining Process by Cun Zhang, Lei Zhang, Mingxue Li, Chen Wang

“…The developed GSM was tested for calculating gas emission quantity from the PCSM process by utilizing the actual geological condition data of a coal mine, which is located in Hancheng, China. The results have shown great agreement with obtained field measurements, which is done by combining the fitting curve of ventilation air methane quantity for PSWF with an interlayer spacing. …”
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A Novel Mining Method for Longwall Panel Face Passing through Parallel Abandoned Roadways by Yang Li, Yuqi Ren, Nan Wang, Junbo Luo, Na Li, Yikun Liu, Guoshuai Li

“…In order to reduce the occurrence of mine pressure accidents and ensure safe mining, a new mining method named “swing-inclined” mining method was proposed and was employed in the E13103 of Cuijiazhai coal mine. Based on the process of the longwall panel face passing through the PARs, a long-span and multisupport mass-structure model of the roof was established. …”
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Parameter design method of supporting coal pillar for end-slope mining under non-uniform load condition by Juyu JIANG, Yulong ZHANG, Lanzhu CAO, Dong WANG, Laigui WANG, Guanghe LI, Chengheng HOU

“…The results show that the necessary and sufficient condition of coal pillar instability is the bifurcation set Δ < 0, the instability criterion of the roof is that the maximum tensile stress σtmax is greater than the tensile strength σtl , the failure criterion of the coal pillar is that the length lmax of the instability section of the coal pillar is greater than the limit caving distance l2max of the roof of the mining cave , the width of the coal pillar in the end-wall mining of an open-pit coal mine in Shanxi is designed to be 3.0 meters.…”
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Energy Dissipation and Fractal Properties of Coal under Cyclic Impact Loading by Yongliang He, Chuantian Li, Yuping Fu, Xuegang Xing, Liying Sun

“…The study of the failure and fractal characteristics of coal samples under different impact pressures and different numbers of impacts provides important information for the prevention and control of coal mine rock bursts.…”
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Effects of biogenic CBM generation on microcrystalline and functional groups of high-volatile bituminous coal by Aikuan Wang, Qiang Huang, Zhiyuan Yao

“…The present research employs four samples of high-volatile bituminous coal, which were obtained from the Huainan Coal Mine located in Anhui Province, China. The samples serve a purpose in a simulation experiment aimed at investigating the generation of biogenic CBM. …”
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Study on the Adhesion Properties of Raw Coal and Adhesive Clogging Characteristics of Underground Coal Bunkers by Chongyang Jiang, Lianguo Wang, Zhiyuan Pan, Jiaxing Guo, Shuai Wang

“…Subsequently, leveraging the adhesion property parameters of raw coal and the engineering conditions of the 1011 roadway coal bunker in Taoyuan Coal Mine II, a numerical model for coal bunker discharge using irregular particles was developed with the PFC2D numerical simulation software. …”
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Roof Bolting Anchoring Performance Research on the Entry under the Gob of Close-Distance Coal Seam by Yongjie Yang, Gang Huang, Haiyu Ji

“…Based on the entry of the No.3-2 coal seam (LCS) in Chaili Coal Mine in China, theoretical analysis, pull-out bolt test, and numerical simulation were performed to calculate the maximum floor failure depth of the UCS and to determine the minimum seam spacing of the roof bolting. …”
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Fracture Characteristics and Disaster-Causing Mechanism of Rock Strata Based on Arch Mechanical Model of Plane Contact Block by Zhang Xin-chao, Du Feng, Tang Jun-hua, Wang Qin-ting, Lu Fei-fei

“…The 52307 working face with large mining height in Daliuta coal mine is chosen as the research background, where there is the special mining condition in the overburden structure with a buried depth of more than 150 m and only one layer of key structure in Shendong mining area. …”
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Study on the effect of acid fracturing fluid on pore structure of middle to high rank coal by Zhao Kang, Li Liangwei, Li Kun, Zuo Shaojie, Jiang Zhizhong

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Experimental Study on Seepage Characteristics of Fractured Rock Mass under Different Stress Conditions by Ma Haifeng, Yao Fanfan, Niu Xin’gang, Guo Jia, Li Yingming, Yin Zhiqiang, Li Chuanming

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Experimental Study on Dynamic Performance of Rock-Concrete Composite with Different Thickness Ratios by Qi Ping, Kaifan Shen, Qi Gao, Chen Wang, Shuo Wang, Yulin Wu, Jing Hu

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Key Bearing Structure Instability Mechanism: A Case Study in Mining Under Close-Distance Coal Pillar by Jieyang Ma, Shihao Tu, Hongsheng Tu, Kaijun Miao, Hongbin Zhao, Long Tang

“…This study established a new key bearing structure model for analyzing the structural instability mechanism when mining under the coal pillar at the working face by taking Shaping Coal Mine as an example. The purpose of this study is to analyze the formation process, load transfer mechanism, and two failure types of the key bearing structure using theoretical analysis and numerical simulation. …”
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Impinging Performance of High-Pressure Water Jets Emitting from Different Nozzle Orifice Shapes by Fei Huang, Jianyu Mi, Dan Li, Rongrong Wang

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Simulation study of pressure wave fluctuation law along fracture under water hammer effect by Jinqi FU, Jun NIAN, Wenxu CHENG

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Height of Mining-Induced Fractured Zones in Overlying Strata and Permeability of Rock with Nonpenetrative Fractures by Yu Liu, Qimeng Liu, Wenping Li, Youbiao Hu

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High-temperature structural disorders stabilize hydrous aluminosilicates in the mantle transition zone by Baoyun Wang, Jin Liu, Yanyao Zhang, Baisheng Nie, Wei Yang, Jialong Hao, Xing Ding, Yongjun Tian

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Influence of Gas from Long-Flame Coal Spontaneous Combustion on Gas Explosion Limit by Haitao Wang, Yongli Liu, Qiyuan Shan

“…To investigate the impact of multiple combustible gases produced by long-flame coal spontaneous combustion on the gas explosion limit and to guide the reoperation of the coal mine goaf and fire area, the influence of gas generated by coal spontaneous combustion on gas explosion limit is investigated in this paper using a temperature-programmed device and a 20 L spherical explosion device. …”
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Reasonable width and control technology of narrow coal pillar in gob-side entry driving in deep-buried bump-prone coal seam by TANG Dongxu, ZHAO Wenguang, ZHANG Junwen, BAN Dingcheng

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