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为了研究断层对底板隔水层稳定性的影响,根据岩石剪切破坏的极限平衡条件推导出隔水层破坏的临界水压力公式,并提出突水判据.基于临界水压力公式分析了断层倾角、内聚力和断层煤柱宽度对底板隔水层破坏的影响规律.结果表明,断层倾角越小,底板隔水层能够承受的临界水压越小,底板就越容易发生突水;若断层带内聚力越小,即断层带强度越软弱,底板临界水压力也随之减小,此时底板发生突水的可能性越大;断层煤柱留设宽度越大,底板越不容易发生突水.工程应用表明预设的煤柱宽度偏小,有发生底板突水的可能,为保证安全开采,根据所推出的临界水压力公式计算得出合理的断层煤柱宽度应为34.3 m.
In order to study the influence of faults on the stability of floor aquifuge, the critical water pressure formula of aquifuge damage is deduced according to the limit equilibrium condition of rock shear failure, and the water inrush criterion is proposed. Based on the formula of critical water pressure, , Cohesion and the width of the coal pillar on the aqueduct of the floor.The results show that the smaller the critical angle of the fault, the smaller the critical water pressure that the aqueduct can withstand, the more prone to water inrush. If the cohesion of the fault zone The smaller the strength of the fault zone, the softer the fault zone, the lower critical pressure of the floor will also decrease, and the probability of water inrush will be greater at this time. The larger the width of the fault pillar, the less prone to water inrush. The application shows that the width of prefabricated pillars is too small and there is a possibility of water inrush from the floor. To ensure safe mining, a reasonable coal pillar width of 34.3 m should be calculated according to the formula of critical water pressure.