Numerical simulation on pressure-relief deformation characteristics of underlying coal-rock mass after upper protective layer excavation  

作　　者：Jian LIU Jie ZHAO Ming-Song GAO 

机构地区：[1]College of Energy and Safety Engineering, Anhui University of Science and Technology, Huainan 232001, China [2]Key Laboratory of Mine Safety and High Efficient Mining Jointly Built by Province and Education Ministry, Anhui University of Science and Technology, Huainan 232001, China [3]Coal Industry Design and Research Institute of Hefei, Hefei 230041, China

出　　处：《Journal of Coal Science & Engineering(China)》2013年第3期276-281,共6页煤炭学报（英文版）

基　　金：Supported by the National Natural Science Foundation of China （51004003）; the Natural Science Foundation of Ministry of Education of Anhui Province （K J2010A091 ）

摘　　要：Based on the occurrence features of Group B coal-seams at a coal mine in the Huainan coal mining area, the elasto-plastic mechanical damage constitutive functions and numerical model for the protective layer excavation were established. With the UDEC2D computer program, after the upper protective layer was mined, the stress field change trends, crack development, and expansion deformation trends of underlying coal rock seams in the floor of the working face were simulated and analyzed. The simulation results show the stress changes in coal rock seams, the evolution process of pre-cracks during the process of upper protective layer mining, the caved zone and fractured zone of the underlying coal rock seams. At the same time, the results from the actual investigation and analysis of protected layer deformation match the simulation values, which verifies the validity and accuracy of numerical simulation results. The study results have an important guiding significance for gas management in low permeability and high gas coal seams with similar mining conditions.

关 键 词：upper protective layer mining pressure-relief deformation underlying coal-rock mass fracture development 

分 类 号：TD324[矿业工程—矿井建设] TV542[水利工程—水利水电工程]