浅埋深保护层开采下伏煤岩体裂隙分布规律

Fissures Distribution Laws of the Underlying Rock Caused by Mining Protective Layer in Shallow Buried Depth

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。

The distribution laws of ground stress shows that the average horizontal ground stress is much larger than the vertical ground stress in shallow depth strata in china, and the horizontal ground stress direction is the direction of the maximum principal stress. According to this, the underlying rock fissures distribution laws in the shallow depth are analyzed; separation fissures are primary, at the same time, a small amount of crossing seam fissures also appear. Finally, the in - site experiments verify the conclusion. In addition, to eliminate the outburst risk about the working face or band area of the protected seams, the work of gas drainage should be done.