大采高工作面煤壁失稳特征及失稳区域预测
Coal Wall Instability Characteristics and Instability Region Predict of Large Mining Height Working Face
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摘要: 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。Abstract: Coal wall instability failure characteristics were analyzed in view of large mining height, and the existence of coal wall weaken points (weaken surface) leading to root causes of large mining height local instability is proposed. According to characteristics of coal wall buckling instability region, coal wall instability sliding mechanics model was established by using Bishop's slice method, and calculation formula of coal wall stability was deduced. In combination with large mining height actual engineering geological conditions in Zhaogu No.2 Coal Mine, it obtained coal wall weaken points (weakened surface) of large mining height working face in different locations of the critical instability of slip plane, and then instability and failure of coal wall coal area was predicted. Measures of preventing damage coal wall instability were proposed on the basis of this, and instability and failure of large mining height coal wall brings to production of safe hidden trouble was effectively solved.
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