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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 analyzes 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. 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, 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. characteristics ofMSS distribution and its evolving rules of surrounding rocks and the integrated cavingthickness effects are obtained. investigations will provi de lots of theoretic reference to the surrounding rocks’ stability control of the working face and roadway, roadway layout, gas extraction and exploitation, and efficiency of caving, etc.