Breaking and mining-induced stress evolution of overlying strata in the working face of a steeply dipping coal seam
Xiaolou Chi1
Ke Yang2
Zhen Wei1
1.State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines,Anhui University of Science and Technology,Huainan 232001,Anhui,China;Key Laboratory of Mining Coal Safety and Construction Efficiency of Anhui Province and Ministry of Education,Anhui University of Science and Technology,Huainan 232001,Anhui,China2.State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines,Anhui University of Science and Technology,Huainan 232001,Anhui,China;Institute of Energy,Hefei Comprehensive National Science Center,Hefei 230031,Anhui,China;Key Laboratory of Mining Coal Safety and Construction Efficiency of Anhui Province and Ministry of Education,Anhui University of Science and Technology,Huainan 232001,Anhui,China
摘要：The breaking features and stress distribution of overlying strata in a steeply dipping coal seam (SDCS) differ significantly from those in a near-horizontal one.In this study,the laws governing the evolution of vertical stress release and shear stress concentration in the overlying strata of coal seams with different dip angles are derived via numerical simulation,rock mechanics tests,acoustic emissions,and field measurements.Thus,the stress-driven dynamic evolution of the overlying strata structure,in which a shear stress arch forms,is determined.Upon breaking the lower part of the overlying strata,the shear stress transfers rapidly to the upper part of the working face.The damaged zone of the overlying strata migrates upward along the dip direction of the working face.The gangue in the lower part of the working face is compacted,leading to an increase in vertical stress.As the dip angle of the coal seam increases,the overlying strata fail suddenly under the action of shear stresses.Finally,the behavioral response of the overlying strata driven by shear stresses in the longwall working face of an SDCS is identified and analyzed in detail.The present research findings reveal the laws governing the behavior of mine pressure in the working face of an SDCS,which in turn can be used to establish the respective on-site guidance.
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论文发表日期：2021-12-30
在线出版日期：2025-08-15（本平台首次上网日期，不代表文献的发表时间）
页数：12( 614-625 )
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