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基于对采动岩体流固耦合作用的力学响应以及底板岩体强度退化机制的认识,针对承压水体上采煤的岩体水力学模型,对底板隔水岩体的长期强度特征进行了分析,并用数值方法再现了含隐伏小断层底板在采动应力扰动和高承压水共同作用下采动裂隙形成、小断层活化、扩张、突水通道最终贯通形成的全过程。通过对损伤演化、应力场和渗流场的解读,揭示了开采扰动及水压驱动下完整底板由隔水岩层到突水通道的演化机理,对突水通道进行时空基准标定,并着重就小断层发育高度、承压水水压力大小对隔水底板的损伤演化模式及突水滞后时间的影响关系进行了分析探讨,从岩体强度退化及损伤演化机制的角度,为承压水体上采煤底板滞后突水的机理分析提供了一些新的认识。
Based on the mechanics response of fluid-solid interaction of mining rock mass and the mechanism of strength degradation of floor rock, according to the hydraulic model of rock mass mining on confined water body, the long-term strength characteristics of floor rock mass are analyzed , And the entire process of formation and propagation of the fault, the activation and expansion of small faults and the breakthrough of the water inrush channel under the action of mining stress disturbance and high confined water is reconstructed numerically. Through the interpretation of damage evolution, stress field and seepage field, the evolvement mechanism of intact floor from water-rock strata to water-bursting channel under mining disturbance and water pressure driving is revealed. The water- Development height and the pressure and pressure of confined water on the damage evolution mode and the influence of water inrush lag time are analyzed and discussed. From the perspective of rock mass strength degradation and damage evolution mechanism, The mechanism of hysteretic water intrusion provides some new understanding.