煤矿井工开采对上覆反向滑坡扰动的模拟研究

Simulation study on the disturbance of coal mining on the reverse landslide

煤系地层的产状与上覆滑坡的产状关系,是影响黄土滑坡稳定性的决定性因素之一。研究煤系地层的倾角与黄土滑坡的倾角相同而倾向相反条件下,主采煤层开采对上覆黄土滑坡的影响,对于滑坡的治理具有重要意义。采用相似材料模拟实验方法,通过模拟含煤岩系倾角30°时的煤层井工开采,总结出上覆岩层移动变形及裂隙分布发育规律和反向黄土滑坡稳定性条件。结果表明:上覆岩层冒落带高度为25.0 m;裂隙带发育高度为72.0 m;采空区范围内覆岩最大下沉值偏向岩层倾向;在工作面推进120 m时黄土滑坡处于临界失稳状态。通过离散元数值模拟模型与相似模拟实验进行了对比,验证了该相似材料模拟实验的可靠性。

The occurrence relationship between coal measure strata and overlying landslide is one of the decisive factors which affect the stability of loess landslide. It is of great significance for landslide treatment to know how the main coal seam mining influences the stability of overlying landslide when the coal measure strata and overlying landslide have the opposite attitude. Similar material simulation experiment method was adopted to testify the mechanism of overlying rock destruction and fracture,and the law of joint fissures and stability condition of the loess landslide due to the coal seam mining through the simulation of coal measure strata dip of 30°mining was concluded. Results show that caving height of overlying rock is 25. 0 meters while crack height of overlying strata is 72. 0 meters,and the maximum subsidence of overlying rock has a tendency towards overlying the attitude of rocks. When the working face advanced a total of 120 meters,the loess landslide is in a state of critical instability. The reliability of the similar material simulation experiment is verified via the comparison of the discrete element numerical simulation model and similarity simulation experiment.