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分析了浅埋煤层开采的水文条件和工程地质条件,得出了浅埋煤层发生溃沙灾害必须具备的4个条件;根据浅埋煤层中组合关键层的一些参数分析了老顶破断岩块的运动规律,判断了浅埋煤层开采中岩块是否发生回转失稳,探讨了岩块回转触矸后发生滑落失稳的可能性,计算了断裂岩块端角接触面高度,得出了满足裂隙滤沙的合理端角接触面高度;大柳塔1203工作面开采只发生了涌水而未溃沙,这和理论计算的结论基本一致.参8.
The hydrological conditions and engineering geological conditions of shallow coal seam mining are analyzed and four conditions that must be met for shallow coal seam collapse are obtained. According to some parameters of key layers in shallow coal seam, The law of motion of the rock mass in shallow coal seam mining is analyzed to determine whether rock failure occurs during the mining of the shallow coal seam. The possibility of slipping and falling instability occurred after the rock block is turned off is discussed. The height of the contact surface at the corner of the rock mass is calculated, The reasonable angle of contact surface of filter sand is the height of the contact surface; only the gushing of 1203 working face of Daliuta has occurred and the water has not collapsed, which is basically consistent with the theoretical calculation.