“双软”煤层工作面矿压显现规律及顶板活动特征研究  

Characteristics of mine pressure and roof strata activity of working face in coal seam with weak roof and floor

作　　者：于健浩 李高建[3] 李岩 刘鹏 杨竹军[3] YU Jian-hao;LI Gao-jian;LI Yan;LIU Peng;YANG Zhu-jun(CCTEG Coal Mining Research Institute,Beijing 101300,China;Tiandi Science and Technology Co.,Ltd.,Beijing 100013,China;Shanxi Changping Coal Limited Liability Company,Jincheng 048000,China)

机构地区：[1]中煤科工开采研究院有限公司,北京101300 [2]天地科技股份有限公司开采设计事业部,北京100013 [3]山西长平煤业有限责任公司,山西晋城048000

出　　处：《煤炭工程》2021年第12期108-112,共5页Coal Engineering

基　　金：天地科技股份有限公司开采设计事业部科技创新基金重点项目(KJ-2019-TDKCZD-01)。

摘　　要：由于“双软”煤层开采条件下煤层、直接顶软弱,存在矿压异常、围岩易失稳等问题,工作面顶板管理难度大,掌握矿压显现特征及覆岩活动规律是解决“双软”煤层条件围岩控制问题的关键。以长平煤业3#煤层为研究背景,在工作面支架压力、巷道围岩应力监测数据分析的基础上,结合微震监测技术手段,掌握顶板破断机制和时空关系,研究矿压规律与顶板活动特征的响应机制,从微震能量的角度对矿压规律进行合理解释。得出如下结论:“双软”煤层条件工作面矿压显现较弱,分段局部来压特征明显,矿压整体呈现中部高—两端低的趋势;两巷超前影响范围较大,最远超过200m;工作面顶板超前破坏、两巷超前大能量微震事件频发是导致工作面矿压强度低、两巷超前应力影响范围大、工作面倾向矿压存在明显差异的主要原因。Due to the weak coal seam and immediate roof in the“double-soft”coal seam mining,there are problems such as abnormal mine pressure and frequent surrounding rock instability.It is difficult to manage the roof of the working face.Mastering the characteristics of mine pressure and the laws of overlying rock activity is the key to the surrounding rock control in“double-soft”coal seams.Taking the Changping Coal Industry 3#coal seam as the research background,based on the analysis of the monitoring data of support pressure and roadway surrounding rock stress,combining with the microseismic monitoring technology,the roof breaking mechanism and time-space relationship is grasped,and the response mechanism of mine pressure law and roof activity characteristics are studied.The rock pressure law is reasonably interpreted from the perspective of microseismic energy,and the following conclusion is drawn:the mine pressure is not intensive,showing segmented local weighting,high pressure in the middle and low at both ends;the two lanes have a large range of influence in advance area,the farthest impact distance exceeds 200m;the advance failure of the working face roof and the frequent occurrence of high-energy microseismic events in the two lanes are the main reasons for the low strength of the working face,the large influence range of the leading stress of the two roadway,and the obvious difference in the tendency of the working face.

关 键 词：“双软”煤层 矿压异常 微震监测 超前应力影响区 顶板超前破坏 

分 类 号：TD326[矿业工程—矿井建设]