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为研究含隐伏断层煤矿底板采动突水发生的力学机理,根据底板隐伏断层赋存的实际特征,建立力学模型。利用断裂力学理论分析方法,研究了工作面推进过程中,在采动应力和承压水压力联合作用下底板突水通道形成的过程。获得了隐伏断层活化突水的力学判据,并分析了影响突水的主要因素。结果表明:临界水压力q是底板突水的必要条件,主要受到隐伏断层长度a、倾角β、支撑压力Q、底板厚度h等因素的影响,而当分支裂纹扩展长度达到一定值,使得有效隔水层厚度不足以抵抗采动应力和承压水压力的作用时,能够满足底板突水的充分条件。根据实际工作面工程地质条件,采用数值模拟方法对底板破坏过程中的底板应力变化和渗流情况进行了分析,使理论分析得到验证。
In order to study the mechanics mechanism of mining water inrush from coal seam floor with concealed fault, mechanical model is established according to the actual characteristics of buried fault of bottom plate. Using fracture mechanics theory analysis method, the formation process of floor water inrush channel under the joint action of mining stress and confined water pressure is studied in the process of working face propulsion. Obtained the mechanical criterion of activating water inrush faults and analyzed the main factors affecting water inrush. The results show that the critical water pressure q is a necessary condition for water inrush from the floor, which is mainly affected by such factors as the hidden fault length a, dip angle β, supporting pressure Q and floor thickness h. When the propagation length of the branch crack reaches a certain value, When the thickness of water layer is not enough to resist the action of mining stress and confined water pressure, it can satisfy the sufficient condition of water inrush from the floor. According to the engineering geological conditions of the actual working face, the floor stress change and seepage situation in the process of floor failure are analyzed by numerical simulation, and the theoretical analysis is verified.