Strata movement and stress evolution when mining two overlapping panels affected by hard stratum  

作　　者：Jianguo Zhang Wei Yang Baiquan Lin Jinjing Zhang Man Wang 

机构地区：[1]State Key Laboratory of Coking Coal Exploitation and Comprehensive Utilization,China Pingmei Shenma Group,Pingdingshan 467000,China [2]Key Laboratory of Gas and Fire Control for Coal Mines(China University of Mining and Technology),Ministry of Education,Xuzhou 221116,China [3]China Pingmei Shenma Group,Pingdingshan 467000,China [4]School of Safety Engineering,China University of Mining and Technology,Xuzhou 221116,China

出　　处：《International Journal of Mining Science and Technology》2019年第5期691-699,共9页矿业科学技术学报（英文版）

基　　金：the National Key R&D Program of China(No.2016YFC0801402);the National Natural Science Foundation of China(No.51874291).

摘　　要：Mining causes stress redistribution and stratum movement.In this paper,a numerical model was built according to the geological conditions in the 12th coal mine in Pingdingshan city to study the strata movement and the evolution of stress when mining two overlapping longwall panels,named panels#14 and#15.The strata close to the mined panel move directly towards the gob,while the strata that are farther away swing back and forth during the mining process.The directed movement and swinging can break the transverse boreholes for gas extraction;a surface borehole should not be within the range of directional movement.The stress evolution suggested that the mining of the lower panel#15 after the upper panel#14 would further increase the de-stressed range,while the stress concentration around the mined panel would be increased.Hard strata usually carry a greater stress than adjacent rocks and soft coal seams.The stress in a hard stratum increases greatly,and the stress decreases greatly in the coal seams below the hard stratum.This study supplies a reference for similar coal mines and is useful for determining the de-stressed range and transverse borehole arrangement for gas extraction.

关 键 词：STRATUM movement MINING LONGWALL panel HARD STRATUM 

分 类 号：TD325[矿业工程—矿井建设]