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通过分析不同深度地应力的分布规律,得出了我国浅埋深地层中平均水平地应力远大于垂直地应力的应力赋存状态,且水平地应力方向为最大主应力方向。以此为基础,分析了浅埋深保护层开采下伏煤岩体裂隙分布规律,即以离层裂隙为主,同时伴随少量的穿层裂隙。最后通过现场实验验证了结论的正确性,同时认为对于浅埋深煤与瓦斯突出煤层群,为确保消除被保护层工作面或条带区域的突出危险性,应对该区域进行瓦斯抽放。
By analyzing the distribution of stress at different depths, we can get the state of stress distribution that the average horizontal stress is much greater than the vertical stress in the shallow depths of our country, and the horizontal stress direction is the direction of the maximum principal stress. Based on this, the distribution of fractures of coal and rock mass under shallow depth and protective layer mining is analyzed, which is mainly the detachment fracture, accompanied by a small amount of stratified fracture. At last, the correctness of the conclusion is verified by field experiments. At the same time, it is considered that for the deep-buried deep coal and gas outburst coal seams, in order to ensure the prominent danger of eliminating the working face or strip area of the protected layer, gas drainage should be carried out in this area.