孤岛工作面顶底板应力传递规律数值模拟研究  

Study on numerical simulation of stress transfer law of isolated working face in top and bottom plate

作　　者：王志强[1] 徐春虎 王鹏[1] 罗健侨 石磊[1] 孙中文[1] Wang Zhiqiang;Xu Chunhu;Wang Peng;Luo Jianqiao;Shi Lei;Sun Zhongwen(School of Energy and Mining Engineering,China University of Mining&Technology-Beijing,Beijing 100083,China;Tongmei Datang Tashan Coal Mine CO.,LTD,Datong Shanxi 037000,China)

机构地区：[1]中国矿业大学(北京)能源与矿业学院,北京100083 [2]同煤大唐塔山煤矿有限公司,山西大同037000

出　　处：《矿业科学学报》2020年第1期67-75,共9页Journal of Mining Science and Technology

基　　金：国家自然科学基金面上项目(51774289);国家自然科学基金青年基金(51404270);中央高校基本科研业务费专项资金(2011QZ06)

摘　　要：针对下伏运输大巷长期受孤岛工作面应力集中影响破坏严重现状,对孤岛工作面进行回收处理,从而减小其对巷道围岩应力集中的影响。采用数值模拟方法,对比分析孤岛工作面回采前后顶底板应力传递规律,探讨孤岛工作面顶板支承压力规律、下伏运输大巷与孤岛工作面底板垂直距离不同时底板应力变化规律。研究发现:随着下伏巷道距离底板距离的增大,巷道围岩应力集中程度呈现减小的趋势;工作面回采后底板应力明显得以释放,底板巷道围岩应力集中系数减小52%~60%;底板巷道围岩剪切破坏呈现X形破坏。研究结果为后续巷道围岩支护优化提供了理论依据。Aiming at the serious damage caused by the stress concentration in the isolated working face for a long time in the underground transportation roadway,the mining treatment of the isolated working face is carried out to reduce its influence on the stress concentration of the surrounding rock of the roadway.This paper compares and analyzes the stress transfer law of roof and floor of isolated working face before and after mining,and probes into the law of roof supporting pressure of isolated working face and the vertical distance between underlying transportation roadway and isolated working face floor by numerical simulation.It found that with the increase of the distance from the floor to the floor,the stress concentration of the surrounding rock of the roadway shows a decreasing trend.When the isolated island face is mined,the stress of the floor is obviously released.The stress concentration factor of surrounding rock of floor roadway is reduced by 52%~60%,and the shear failure of surrounding rock of floor roadway presents X failure,which provides theoretical basis for the optimization of surrounding rock support in subsequent roadway.

关 键 词：孤岛工作面 顶底板应力 传递规律 数值模拟 X形破坏 

分 类 号：TD[矿业工程]