覆岩裂隙带发育高度数值模拟与探测

Numerical Simulation and Detection Study on the Height of Water Flowing Fractured Zone in Overburden Strata

根据锦丘煤矿开采技术条件和围岩力学参数等,建立了力学模型,运用三维显式有限差分法软件Flac3D对自开切眼至充分采动全过程覆岩随工作面推进时的应力、位移和破坏情况进行了数值模拟,由此确定了覆岩导水裂隙带高度。用经验公式对导水裂隙带高度进行了计算,并采用钻孔分段注水法对裂隙带高度进行了现场探测验证,证明数值模拟方法能提供较为理想的预测精度,从而为确定覆岩导水裂隙带高度提供了一种新的且简易可靠的方法。

The mechanics model is established according to the mechanics parameters of rocks and the exploitation technical conditions of Qinqiu coal mine.By using 3-D explicit finite difference FLAC3D software,the situation of stress,displacement and failure are simulated from open-off cut to full mining to determine the height of water flowing fractured zone in overlying strata as the coalface advanced.That height is calculated by empirical formula and is detected on spot by drilling piecewise injection method.It is approved that the numerical simulation method can provide ideal prediction accuracy,thus providing a new,simple and reliable method to predict the height of water flowing fractured zone.