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Assessment and analysis of strata movement with special reference to rock burst mechanism in island longwall panel

Journal of Central South University 2017年第12期24卷 2951-2960页

作者： ZHU Guang-an DOU Lin-ming CAO An-ye CAI Wu WANG Chang-bin LIU Zhi-gang LI Jing Key Laboratory of Deep Coal Resource of Ministry of Education China University of Mining and TechnologyXuzhou 221116 China School of Mines China University of Mining and Technology Xuzhou 221116 China

This study presents a novel approach using theoretical analysis to assess the risk of rock burst of an island longwall panel that accounts for the coupled behavior of stress distribution and overlying strata movement. The height of destressed zone(HDZ) above the mined panel was first determined based on the strain energy balance in an underground coal mining area. HDZ plays a vital role in accurately determining the amount of different loads being transferred towards the front abutment and panel sides. Subsequently, based on the load transfer mechanisms, a series of formulae were derived for the average static and dynamic stresses in the island pillar through theoretical analysis. Finally, the model was applied to determining the side abutment stress distribution of LW 3112 in the Chaoyang Coal Mine and the results of ground subsidence monitoring were used to verify the predicted model. It can be concluded that the proposed computational model can be successfully applied to determining the safety of mining in island longwall panels.

关键词： island longwall panel overburden structure height of destressed zone stress distribution rock burst risk

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Modeling and simulation of strata movement for protective seam mining with large interburden

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Journal of Coal Science & Engineering(China) 2009年第1期15卷 46-49页

作者： SONG Chang-sheng LI De-hai LI Hua-min School of Energy and Science Engineering Henan Polytechnic University Jiaozuo 454000 China Henan Education Department Engineering ＆ Technology Research Center for Coal and Gas Safety Mining Jiaozuo 454000 China

Based on simulated material scale modeling and numerical simulation, the protective seam mining method was conducted at one coal mine. After extracting the No.15seam, the overlying strata movement and the deformation of the No.9-10 protected seamwere studied. The experiment results show that it is feasible to destress the protectedseams with large interburden thickness. When the face had advanced 200 m from thesetup room, the No.9-10 seam was fully destressed, resulting in easy gas drainage in thedestressed zone. Recommendations on mining sequence of multiple seams mining in thesame coal areas were made.

关键词： large interburden protective seam mining strata movement destressed

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