Caving thickness effects of surrounding rocks macro stress shell evolving characteristics  

作　　者：XIE Guang-xiang YANG Ke 

机构地区：[1]Key Laboratory of Coal Mine Safety and Efficiently Caving of Ministry of Education, Anhui University of Science and Technology, Huainan 232001, China

出　　处：《Journal of Coal Science & Engineering(China)》2009年第2期188-192,共5页煤炭学报（英文版）

基　　金：Supported by National Basic Research Program(973)(2005cb221503);National Natural Science Foundation of China(50674003);Science and Technological Fund of Anhui Province for Outstanding Youth(08040106839)

摘　　要：In order to explore the influence of different caving thicknesses on the MSS distributionand evolving characteristics of surrounding rocks in unsymmetrical disposal andfully mechanized top-coal caving (FMTC),based on unsymmetrical disposal characteristics,the analyses of numerical simulation,material simulation and in-situ observation weresynthetically applied according to the geological and technical conditions of the 1151(3)working face in Xieqiao Mine.The results show that the stress peak value of the MSS-baseand the ratio of MSS-body height to caving thickness are nonlinear and inverselyproportional to the caving thickness.The MSS-base width,the MSS-body height,theMSS-base distance to working face wall and the rise distance of MSS-base beside coalpillar are nonlinear and directly proportional to the caving thickness.The characteristics ofMSS distribution and its evolving rules of surrounding rocks and the integrated cavingthickness effects are obtained.The investigations will provide lots of theoretic referencesto the surrounding rocks' stability control of the working face and roadway,roadway layout,gas extraction and exploitation,and efficiency of caving,etc.In order to explore the influence of different caving thicknesses on the MSS distribution and evolving characteristics of surrounding rocks in unsymmetrical disposal and fully mechanized top-coal caving （FMTC）, based on unsymmetrical disposal characteristics, the analyses of numerical simulation, material simulation and in-situ observation were synthetically applied according to the geological and technical conditions of the 1151（3） working face in Xieqiao Mine. The results show that the stress peak value of the MSS- base and the ratio of MSS-body height to caving thickness are nonlinear and inversely proportional to the caving thickness. The MSS-base width, the MSS-body height, the MSS-base distance to working face wall and the rise distance of MSS-base beside coal pillar are nonlinear and directly proportional to the caving thickness. The characteristics of MSS distribution and its evolving rules of surrounding rocks and the integrated caving thickness effects are obtained. The investigations will provide lots of theoretic references to the surrounding rocks＇ stability control of the working face and roadway, roadway layout, gas extraction and exploitation, and efficiency of caving, etc.

关 键 词：caving thickness effect macro stress shell evolving characteristic fully mechanized top-coal caving unsymmetrical disposal 

分 类 号：TD823.97[矿业工程—煤矿开采] TD353.6[矿业工程—矿山开采]