摘要
钻屑法作为一种测定煤体应力分布的方法在煤矿中被广泛使用,同时该方法也是监测冲击危险最为直接的有效方法之一。在理论介绍钻屑法监测煤体应力及冲击危险原理及其评价指标的基础上,具体针对705工作面回采过上区段停采线遗留煤柱危险区期间的冲击严峻形势,采用钻屑法对该危险区域的应力分布状态进行了探测,并进一步获得了该工作面回采期间的钻屑指标临界值。监测结果表明:(1)该区域存在3个明显的应力特征分区,即采空区侧应力降低区、煤柱应力集中区和原始应力区,其中煤柱应力集中区的分布范围为50 m。(2)采空区侧支承压力峰值位于6 m位置,煤柱影响区和原始应力区支承压力峰值位于8~9 m,总体平均位于6~9 m位置。(3)705工作面冲击危险监测的钻屑指标临界值为钻孔深度第2~5 m处为3.02 kg/m,第6~10 m处为4.44 kg/m。
Drilling cuttings method,as a method of measuring the stress distribution,has been widely used in coal mines.Moreover,it is one of the most direct and effective ways for rock burst hazards assessment.To begin with,the principle of drilling cuttings method for monitoring coal stress and rock burst hazard was described in theoretical,and its evaluation index was determined.Especially considering the serious coal and rock dynamic disasters when No.705 working face mined across the legacy coal pillar danger zone near terminal line,the drilling cuttings method was adopted to detect the stress distribution,and finally the index critical value was obtain.The monitoring results show that:(1)There are three distinct stress feature zones in the region:gob stress reduction zone,coal pillar stress concentration zone,and virgin stress zone.It was deduced that the distribution range of the coal pillar stress concentration is about 50 m.(2)Abutment pressure peak was near 6 m location in the gob side,about 8-9 m in the coal pillar zone and the virgin stress zone,averaging near 6-9 m.(3)The critical value of the drilling cutting index for No.705 working face was obtained:3.02 kg/m in depth 2-5 m and 4.44 kg/m in 6-10 m.
作者
李作泉
张龙
邵嗣华
乔国民
曹仕学
马金魁
LI Zuoquan;ZHANG Long;SHAO Sihua;QIAO Guomin;CAO Shixue;MA Jinkui(Gansu Jingyuan Coal Industry and Electricity Power Co.,Ltd.,Baiyin 730913,China;China Coal Technology&Engineering Group Shenyang Research Institute,Fushun 113122,China;State Key Laboratory of Coal Mine Safety Technology,Fushun 113122,China)
出处
《煤炭技术》
CAS
北大核心
2022年第5期137-141,共5页
Coal Technology
关键词
钻屑法
煤体应力分布
冲击危险
钻屑指标临界值
支承压力
drilling cuttings method
coal stress distribution
rock burst hazard
critical value of cuttings index
support pressure
