Mine Safety Technology Branch,China Coal Research Institute Co.Ltd. National Key Lab of Coal Resources HighEfficient Mining and Clean Uilization,China Coal Research Institute Henan Energy and Chemical Xinjiang Group Co.,Ltd.

基于工作面采动覆岩裂隙分布的微震监测结果,分析了微震事件分布与采动覆岩破裂的关系,采用经验公式和现场矿压监测结果,对比研究了采动覆岩裂隙分布特征。结果表明:沿竖直方向,微震事件在距离煤层0~40 m为高密度分布,在40~70 m内中密度分布,70 m以上为低密度分布;沿工作面倾斜方向,微震事件集中分布于3个区域,分别为机头区域Ⅰ、工作面45~90 m区域Ⅱ和90~120 m区域Ⅲ;基于微震监测推断得到的采动裂隙带高度(工作面煤层上方20~70 m范围),与基于经验公式得到的采动裂隙带高度约为80 m基本吻合;随工作面推进,微震事件能量具有周期性分布特点,周期步距平均为30 m,与支架工作阻力揭示的周期来压步距吻合。研究成果为采动覆岩裂隙分布特征研究和应用提供了一种监测方法。

Based on the microseismic monitoring and measuring results of the fracture ditibution in the mining overburden strata above the coal mining face,the paper analyzed therelationship between the microseismic events ditibution and mining- induced fracture in strata. The emprical formula and the site mine stata pressure montoring and measuring resuts were appied to the comparison stuty on the fracture ditibution features of the mining overburden stata The resuts showed tatalong the vertial lrection,.the microseisnic events o.cured with adistance of 0 ~40 m to the sean was distributed in a high densitythe microseismic events with a dstance of 40~70 m to the seam was distributed in a medum density and the microseismic events with a distance over 70 m was distributed in a lovw densit .Aong the nclination drection of the coal mining face,the microseismic everts was concentrated and ditriuted in hvee aress and they were the conveyor head area 1 45 ~ 90 marea Ⅱ of the coal mining face and 90 ~ 120 m are lⅢ of the coal mining fac.Based on the height(20~70 m above the sean ofthecal mining face) fthe waterconducted zone obtained from the microseismic montoring resut.based on the height ofthe water conducted zone outained fom the empircal formula wa 80 m and couldbe basicall fit.With the advancing forvard of the coal mining face.the energy of the microseismic events vould have periodcl citrituion features.theperodical stepdistance of the microse isnic events was 30 m in average and could be ftld with periodic weighting revealed by the working res stance of the powered support The study achievement could provide a monitoring and measuring method to the study and application on the fracture distribution features of the mining overburden stata.

“十二五”国家科技重大专项资助项目(2011ZX05040-002-004)；国家自然科学基金青年基金资助项目(51304117,51404140)；