Numerical simulation of protection range in exploiting the upper protective layer with a bow pseudo-incline technique  

作　　者：HU Guo-zhong WANG Hong-tu LI Xiao-hong FAN Xiao-gang YUAN Zhi-gang 

机构地区：[1]Key Lab for Exploitation of China Southwestern Resources ＆ Environmental Disaster Control Engineering, Ministry of Education, Chongqing University, Chongqing 400030, China

出　　处：《Mining Science and Technology》2009年第1期58-64,共7页矿业科学技术（英文版）

基　　金：Projects PLN0610 supported by the Open Fund of State Key Lab of Oil and Gas Reservoir Geology and Exploitation (Southwest Petroleum University);HKLGF200706 by the Opening Project of Henan Key Laboratory of Coal Mine Methane and Fire Prevention;50334060, 50474025 and 50774106 by the National Natural Science Foundation of China;2005CB221502 by the National Basic Research Program of China;50621403 by the Natural Science Innova-tion Group Foundation of China;CSTC, 2006BB7147, 2006AA7002 by the Natural Science Foundation of Chongqing

摘　　要：The developing processes of stress and deformation fields of a protected layer after mining an upper-protective layer with a bow pseudo-incline technique were simulated to locate the protection region. The pressure relief of the protected layer was analyzed after mining the upper-protective layer. The pressure relief angle along the strike and incline were located according to the roles of protection of the deformation and stress pressure-relief of the protective layer after mining. This results show that the upper-protective layer with the bow pseudo-incline technique have an upper and downside pressure relief angle of 85 and 68 degrees respectively; the distribution of strike pressure relief angles along the pseudo-incline working face is uneven and their values range from 38.3 to 51 degrees. The pressure relief angle of the inclined middle location was the largest. The distribution of the protection region of the upper-protective layer with the bow pseudo-incline teelmique located by practical tests and numerical simulation is essentially consistent, compared with the results obtained by these methods.The developing processes of stress and deformation fields of a protected layer after mining an upper-protective layer with a bow pseudo-incline technique were simulated to locate the protection region. The pressure relief of the protected layer was analyzed after mining the upper-protective layer. The pressure relief angle along the strike and incline were located according to the rules of protection of the deformation and stress pressure-relief of the protective layer after mining. This results show that the upper-protective layer with the bow pseudo-incline technique have an upper and downside pressure relief angle of 85 and 68 degrees respectively; the distribution of strike pressure relief angles along the pseudo-incline working face is uneven and their values range from 38.3 to 51 degrees. The pressure relief angle of the inclined middle location was the largest. The distribution of the protection region of the upper-protective layer with the bow pseudo-incline technique located by practical tests and numerical simulation is essentially consistent, compared with the results obtained by these methods.

关 键 词：bow pseudo-incline technique upper-protective layer protection region 3D numerical simulation 

分 类 号：TD7[矿业工程—矿井通风与安全]