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为研究重复采动下覆岩裂隙演化规律,以同煤集团煤峪口煤矿410盘区为地质原型,利用物理相似材料模拟实验模拟近距离煤层重复采动覆岩裂隙发育发展演化过程,运用分形几何理论研究重复采动条件下,覆岩裂隙网络分形特征.实验结果表明:随着开采宽度的增大,上层开采裂隙分形维数随之变大,其增幅随着宽度增加逐渐变小;而下层开采裂隙分形维数与开采宽度呈抛物线变化关系;开采采场覆岩裂隙上层煤分形维数与工作面前方支承压力峰值满足Freundlich方程,而与切眼附近支承压力峰值满足Langmuir方程,下层煤关系不明显;覆岩“三带”裂隙网络具有很好的自相似性,上层回采完裂隙带、冒落带分形维数比为1.0575:1;而下层煤为1.024:1.
In order to study the evolution law of overburden rock under repeated mining, taking 410 area of Meiyukou coal mine of Tongmei Group as a geological prototype, the physical and similar material simulation experiment was used to simulate the development and evolution of overburden rock during repeated mining of close coal seam. The geometrical theory is used to study the fractal characteristics of the overburden fracture network under the condition of repeated mining.The experimental results show that as the mining width increases, the fracture fractal dimension of the upper mining becomes larger along with the increase of width, The fracture fractal dimension of the lower mining has a parabolic relationship with the mining width. The fractal dimensions of fractured upper strata in the mining stope and the front supporting pressure peak meet the Freundlich equation, while the peak pressure near the cut eye satisfies the Langmuir equation, The relationship between the overlying strata and the “three belts” fractured network is very good. The upper fractured zone has a fractal dimension ratio of 1.0575: 1 and the lower strata is 1.024: 1.