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 

作者机构：State Key Laboratory of Coking Coal Exploitation and Comprehensive UtilizationChina Pingmei Shenma GroupPingdingshan 467000China Key Laboratory of Gas and Fire Control for Coal Mines(China University of Mining and Technology)Ministry of EducationXuzhou 221116China China Pingmei Shenma GroupPingdingshan 467000China School of Safety EngineeringChina University of Mining and TechnologyXuzhou 221116China 

出 版 物：《International Journal of Mining Science and Technology》 (矿业科学技术学报（英文版）)

年 卷 期：2019年第29卷第5期

页      面：691-699页

核心收录：

学科分类：081901[工学-采矿工程] 0819[工学-矿业工程] 0709[理学-地质学] 0808[工学-电气工程] 08[工学] 0818[工学-地质资源与地质工程] 0708[理学-地球物理学] 0807[工学-动力工程及工程热物理] 0815[工学-水利工程] 0813[工学-建筑学] 0814[工学-土木工程] 

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

主　　题：Stratum movement Mining Longwall panel Hard stratum 

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.