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Roadway layout for recycling residual coal pillar in room-and-pillar mining of thick coal seam

International Journal of Mining Science and Technology 2015年第5期25卷 729-734页

作者： Jin Gan Wang Lianguo Zhang Jihua Hu Minjun Duan Ning State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining & Technology Xuzhou 221008 China School of Mechanics & Civil Engineering China University of Mining & Technology Xuzhou 221666 China

In the context of a room-and-pillar mining gob in Shanxi province in China,this paper numerically investigates the stress distribution and deformation rules of roadway surrounding rocks at various locations of residual coal pillars in room-and-pillar mining gobs using software FLAC3 *** is found that the concentrated stress beneath coal pillars distributes in a shape of ellipse.A reasonable roadway layout is then *** this design,it is indicated that roadways should be designed to avoid the supporting zones of pillars with increasing compression and take into account the roof falling and crushing in the upper *** to the surrounding rock deformation characteristics and mining roadway locations as well as the supporting principles of timely support,rock reinforcing,piecewise management and suiting local conditions,a new asymmetric shield supporting plan is *** field surveying results show that this supporting plan can effectively control the roadway rock deformation,thus guarantee the safe and smooth construction of roadways.

关键词： Room-and-pillar mine residual coal pillar Repeated mining Roadway layout Asymmetric support

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Monitoring and evaluation of disaster risk caused by linkage failure and instability of residual coal pillar and rock strata in multi-coal seam mining

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Geohazard Mechanics 2023年第4期1卷 297-307页

作者： Qing Ma Xiaoli Liu Yunliang Tan Yurui Wang Ruosong Wang Enzhi Wang Xuesheng Liu Zenghui Zhao Darui Ren Weiqiang Xie Ruipeng Qian Nan Hu State Key Laboratory of Hydroscience and Engineering Tsinghua UniversityBeijing100084China College of Energy and Mining Engineering Shandong University of Science and TechnologyQingdaoShandong266590China Shandong Energy Xinwen Group Xinjulong CO.LTD Shandong294718China

Comprehensive research methods such as literature research,theoretical analysis,numerical simulations and field monitoring have been used to analyze the disasters and characteristics caused by the linkage failure and instability of the residual coal pillars-rock strata in multi-seam *** effective monitoring area and monitoring design method of linkage instability of residual coal pillar-rock strata in multi-seam mining have been *** evaluation index and the risk assessment method of disaster risk have been established and the project cases have been applied and *** results show that:①The coal pillar will not only cause disaster in singleseam mining,but also more easily cause disaster in multi-seam *** instability of coal pillars can cause not only dynamical disasters such as rock falls and mine earthquakes,but also cause surface subsidence and other disasters.②When monitoring the linkage instability of residual coal pillar-rock strata,it is not only necessary to consider the monitoring of the apply load body(key block),the transition body(residual coal pillar)and the carrier body(interlayer rock and working face),but also to strengthen the monitoring of the fracture development height(linkage body).③According to the principles of objectivity,easy access and quantification,combined with investigation,analysis,and production and geological characteristics of this mining area,the main evaluation indexes of the degree of disaster caused by linkage instability of residual coal pillar-rock strata are determined as:microseismic energy,residual coal pillar damage degree,fracture development *** the evaluation index classification table was also given.④According to the measured value of the evaluation index,the fuzzy comprehensive evaluation method was used to calculate the disaster risk degree in the studied mine belongs to class III,that is,medium risk *** corresponding pressure relief technology was adopted on site,which ach

关键词： Multi-seam mining residual coal pillar Linkage instability Rock burst Monitor and evaluation

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Stress-strain-acoustic responses in failure process of coal rock with different height to diameter ratios under uniaxial compression

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Journal of Central South University 2021年第6期28卷 1724-1736页

作者： GUO Yu-xia ZHAO Yong-hui WANG Sheng-wei FENG Guo-rui ZHANG Yu-jiang RAN Hong-yu College of Mining Engineering Taiyuan University of TechnologyTaiyuan 030024China Shanxi Province Research Centre of Green Mining Engineering Technology Taiyuan 030024China

residual coal pillars play an important role in mining the adjacent coal seam safely,managing the gobs and maintaining the stability of abandoned coal *** height to diameter ratio(H/D)affects the stability of residual coal *** this study,uniaxial compressive tests of coal specimens with five H/D(2.0,1.5,1.0,0.8 and 0.6)were performed,and the stress,strain and acoustic emission(AE)were *** show that the uniaxial compressive strength(UCS)and peak strain increase with H/D *** empirical equation is proposed to calculate the UCS based on the H/*** AE activities during coal failure process can be separated into four *** span of quiet period and rapid decline period shorten with H/D *** smaller the H/D is,the more complicated the failure characteristics of coal will *** failure form of coal with H/D of 2.0,1.5,and 1.0 is primarily shear failure,while splitting failure along the axial direction is the mainly mode when H/D is 0.8 or *** initiation,expansion,aggregation and connection of micro-cracks can be reflected by the real-time spatial evolution of AE event points.

关键词： residual coal pillar height to diameter ratio uniaxial compression acoustic emission micro-crack evolution

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