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基于弹性损伤力学理论,建立了考虑不同围压下岩石残余强度的分段线性弹性损伤本构模型,利用岩石常规三轴压缩实验和劈裂实验确定了损伤模型的基本参数。以某矿井工程地质条件为背景,采用MATLAB软件编程将损伤本构模型嵌入到COMSOL软件中,对工作面推进过程中含断层煤层底板的损伤破坏演化规律进行了数值模拟研究。结果表明,当工作面回采至断层区域附近时,断层带活化区将与开采造成的底板破坏区相连接,显著地增大了底板的破坏深度,削弱了隔水层的隔水性能,增加了底板突水的可能性。采用高精度微地震监测仪对煤层底板破坏范围进行了现场动态监测,监测结果与数值模拟结果基本吻合。
Based on the theory of elastic damage mechanics, a piecewise linear elastic damage constitutive model considering rock residual strength under different confining pressures was established. The basic parameters of the damage model were determined by conventional rock triaxial compression tests and splitting experiments. Taking the engineering geological conditions of a mine as the background, the damage constitutive model was embedded into the COMSOL software by MATLAB software programming, and the numerical simulation of the damage and failure evolution of the coal seam floor with the fault during the advancing process was carried out. The results show that when the working face is recovered to the vicinity of the fault zone, the fault zone activation zone will be connected with the bottom plate destruction zone caused by mining, which significantly increases the destruction depth of the bottom plate, weakens the water barrier performance of the water barrier and increases The possibility of water in the floor. High-precision microseismic monitoring instrument was used to monitor the failure range of coal seam floor dynamically. The monitoring results are in good agreement with the numerical simulation results.