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针对大采高工作面煤壁失稳特征进行分析,提出了煤壁中弱化点(弱化面)的存在是导致大采高煤壁局部失稳片帮的根本原因。根据煤壁失稳区域破坏特征,利用毕肖普条分法建立了煤壁临界失稳滑移力学模型,推导出煤壁安全稳定性计算公式。结合赵固二矿大采高工作面实际工程地质条件,得出该矿大采高工作面煤壁中弱化点(弱化面)在不同位置处的临界失稳滑移面,进而预测了煤壁失稳破坏煤体的范围。在此基础上提出了控制煤壁失稳破坏的方法,有效地解决了大采高工作面煤壁失稳破坏给生产带来的安全隐患。
In view of the characteristics of coal wall instability in large coal mining face, it is put forward that the existence of weakening point (weakening surface) in coal wall is the root cause of local destabilizing sheet gang of large coal mining face. According to the failure characteristics of coal wall instability region, the critical slip stability model of coal wall is established by the Bishop method, and the formula for calculating the safety and stability of coal wall is deduced. Combined with the actual engineering geological conditions of the large mining face in Zhaogou No.2 coal mine, the critical instability slip surface of the weakening point (weakening surface) at different positions in the coal mining face with large mining height is obtained, and then the coal wall Unstable damage the scope of coal. On this basis, a method of controlling the instability of coal wall is put forward, which effectively solves the potential safety hazard brought by the destabilization of coal wall in large mining height.