Research on the Failure Mechanism of Water-Resisting Floor Affected by Fault
Research on the Failure Mechanism of Water-Resisting Floor Affected by Fault
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发表时间：
2010
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通讯作者：
Liu Hui
中科院分区：
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作者：
Liu Hui
根据岩石剪切破坏的极限平衡条件，推导了断层对隔水底板稳定性影响的临界水压力公式，提出了隔水底板的突水判据，并在此基础上分析了断层倾角、断层粘聚力、断层柱宽度对隔水底板稳定性的影响规律，主要结果如下：1）断层倾角越小，隔水底板的承载能力越低，底板越容易突水; 2）断层的粘聚力越小，即断层的强度越弱，底板的临界水压力越小，突水的可能性就越大;工程应用表明，预留的断层煤柱较小，发生突水的可能性较大，为了保证安全开采，根据推导的公式计算，合理的断柱宽度应为34.3m。
According to the limit equilibrium condition of rock's shear failure,we deduce the formula of critical water pressure to study the effect of fault on the stability of water-resisting floor and propose the water-inrush criterion.Based on the deduced formula,we analyze the effect laws caused by the dip angle,the cohesion force of fault,and the width of fault pillar.The main results are as follows: 1) the smaller the dip angle of fault is,the lower the bearing ability of the water-resisting floor will be,thus the water-inrush of floor will happen more easily;2) the smaller the cohesion force of fault is,namely the weaker the strength of the fault is,the less the critical water pressure of the floor will be,and the greater the probability of the water-inrush becomes;and 3) the larger the fault pillar is,the more difficultly the water-inrush will happen.The engineering application shows that the reserved fault pillar is small,so it is quite possible to have the water-inrush.For the safety mining,the reasonable width of fault pillar should be 34.3 m according to the calculation with the deduced formula.