The fracture instability mechanism of the basic roof is the key to support selection and surrounding rock stability control, and it is also the guarantee of safe and efficient coal mining. By means of theoretical analysis and numerical calculation, the calculation model of basic roof of steeply dipping coal seams (SDCS) under linear load is established, the stress distribution expression of basic roof plate is deduced, the inclination effect of stress evolution of steeply dipping coal seams (SDCS) workface is analyzed, and the “sequential” weighting mechanism of workface is revealed. Based on the numerical simulation test, the evolution laws of vertical stress release and shear stress concentration of overlying strata in workface with different coal seam dip angles are obtained. The results show that there is shear stress arch in the overlying strata. With the increase of coal seam dip angle, the overlying strata are suddenly damaged under the action of shear stress. The roof is in the state of discontinuous movement due to its self-weight and overburden pressure. Support is affected by the discontinuous movement and moved along with the roof. The results of this study can be of theoretical reference to the control of SDCS.

中文翻译：

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大倾角煤层综采工作面主倾角破裂对顶板主裂缝和失稳的影响

基本顶板的破裂失稳机理是支护选择和围岩稳定控制的关键，也是安全高效采煤的保证。通过理论分析和数值计算，建立了线性荷载作用下陡倾煤层基本顶板的计算模型，推导了基础顶板的应力分布表达式，提出了陡倾煤层应力演化的倾斜效应。分析了接缝（SDCS）工作面，并揭示了工作面的“顺序”加权机制。在数值模拟试验的基础上，得到了不同煤层倾角下工作面上覆岩层垂直应力释放和切应力集中的演化规律。结果表明，上覆地层中存在切应力拱。随着煤层倾角的增加，上覆地层在剪切应力作用下突然受到破坏。屋顶由于其自重和上覆压力而处于不连续运动状态。支撑受不连续运动的影响，并随屋顶一起移动。研究结果可为SDCS的控制提供理论参考。