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基于岩石破裂损伤理论和有限元计算方法。利用岩石破裂过程分析软件RFPA2D对远距离保护层开采过程进行了模拟,呈现了上覆岩破裂、垮落过程;分析了被保护层应力分布特征和透气性系数变化规律;得出了垮落带的范围为10～18 m,裂隙带的范围为25～35 m;且被保护层应力分布符合正弦函数,出现周期来压现象;透气性系数增加了数十至数百倍。
Based on rock damage theory and finite element method. The rock burst process analysis software RFPA2D was used to simulate the mining process of long-distance protective layer and the overlying rock was ruptured and collapsed. The stress distribution and permeability coefficient of the overburden rock were analyzed. The caving zone In the range of 10 ~ 18 m, the range of fracture zone is 25 ~ 35 m; and the stress distribution of the protected layer accords with the sine function, and the periodic pressure phenomenon occurs; the permeability coefficient increases by tens to hundreds.