基于微震监测的顶板导水裂隙带发育高度研究

煤层顶板导水裂隙带发育高度作为矿井的基础参数,对矿井灾害防治具有重要意义,以古汉山矿1604放顶煤工作面为研究背景,分别采用微震监测和数值模拟等手段对顶板导水裂隙带的发育高度进行研究,通过对微震系统台网布置方式进行误差分析,围绕工作面构建了三巷空间布置的微震台网,对监测结果分析表明：工作面直接顶、老顶的破坏程度远大于其上覆岩层,顶板的连续破坏区域整体呈“钝三角形”,导水裂隙带的发育高度约为75m。通过数值模拟计算得出1604工作面顶板导水裂隙带发育高度约为71m,与基于微震监测分析的结果基本吻合,为类似工作面的导水裂隙带探测提供借鉴和参考。

Study on the Development Height of Roof Water-conducting Fracture Zone based on Microseismic Monitoring

Abstract：As the basic parameter of mine, the development height of water-conducting fracture zone in roof of coal seam plays an important role in mine disaster prevention. Based on the crack evolution law of different stages in the stress-strain curve and acoustic emission characteristics of rock, the feasibility of microseismic monitoring technology to determine the height of water-conducting fracture zone was analyzed. A microseismic system was built around the 1604 caving top coal face of Guhanshan coal mine, and the results show that the damage degree of the direct roof and the old roof of the working face is much higher than that of the overlying strata. The continuous failure area of the roof is a "blunt triangle" and the development height of water-conducting fracture zone is about 75 m. The numerical simulation results show that the height of roof water-conducting fracture zone in the working face 1604 is about 71 m. The results based on microseismic monitoring analysis are verified, which provides a new method for measuring the height of roof water-conducting fracture zone in coal mine.