并行电法监测工作面垮落带岩层动态变化.pdf

　 第37卷第4期 煤　 　 炭　 　 学　 　 报 Vol.37　 No.4　 　 2012年 4月 JOURNAL OF CHINA COAL SOCIETY Apr.　 2012　 - - - 　 　 文章编号:0253 9993(2012)04 0571 07 并行电法监测工作面“垮落带”岩层动态变化 吴荣新,张　 卫,张平松 (安徽理工大学 地球与环境学院,安徽 淮南　 232001) 摘　 要:在工作面高抽巷中布置电法监测系统,所有电极均布置在巷道底板位置,采用并行电法仪 采集数据,进行高分辨地电阻法反演成像,根据工作面回采与电性参数变化关系,分析了“垮落带” 岩层的动态变化特征:伴随回采工作面的推进,存在采动应力影响,观测范围局部岩层裂隙发育,导 致周期性的电性变化,可能与工作面周期来压事件有关;工作面周期来压期间,覆岩破坏可能以大 块破断与冒落为主,电性参数变化大;工作面周期来压间隔期内,覆岩破坏可能以小块破断与冒落 为主,电性参数呈渐变形式;给出了工作面超前采动应力作用范围、周期来压步距及垮落带高度。 关键词:并行电法;煤层工作面;垮落带;电阻率;覆岩破坏 中图分类号:TD325．4　 　 　 文献标志码:A Exploration of parallel electrical technology for the dynamic variation of caving zone strata in coal face WU Rong-xin,ZHANG Wei,ZHANG Ping-song (School of Earth and Environment,Anhui University of Science and Technology,Huainan　 232001,China) Abstract:The observation system of electrical methodwaslaid inthe gasdrainagetunnel abovethe coalface,with all the electrodessetinthetunnelfloor.Theelectricaldatawerecollectedbytheparallelelectricalinstrument,andthere- sistivity inversion of high-resolution ground electric resistance method was adopted to acquire the measured images. Based on the relationship between the electrical character variation and coal face caving locations,the dynamic varia- tion features of caving zone strata were analyzed asfollows:accompanying to coal face mining,there exists mining-in- duced stress in some locations of overburden strata,which lead to periodic electric character variation related to cycle weighting;during cycle weighting,the main form of overburdenfailuresislarge block of fracturing and collapsing,and the electric character features change