UDEC numerical simulation method is used to study the dynamic characteristics of underground fractured medium water in the activation process of a reverse fault with dip angle of 25° under the action of El-Centro seismic wave. By loading the El-Centro seismic wave with amplitude of 0.1g,0.2g,0.4g,0.6g,0.8g,1g, the simulated permeation rate of under-ground fissure water are compared with the results obtained by the hydrodynamic theory of underground fractured medium water. The following conclusion has been drawn:when the acceleration amplitude of the input seismic wave is close to the threshold of the fault activation (0.8g),the curve of seepage velocity of underground fissure water shows a strong fluctuation due to the var-ied width of the seepage channel caused by earthquake. In addition,the inertial force caused by the earthquake is one of the cau-ses for the change of the groundwater seepage velocity. Meanwhile,the time curve of fracture water seepage in time cell also o-beys the seepage law of water in fractured medium.%采用UDEC数值模拟方法,研究了在El-Centro地震波作用下某倾角为25°的逆断层活化过程中地下裂隙介质水的动力学特征规律.在加载加速度幅值为0.1,0.2,0.4,0.6,0.8 g和1 g El-Centro地震波时,将地下裂隙水渗透速率数值模拟结果与地下裂隙介质水动力理论的分析结果进行了对比.对比结果表明:输入地震波加速度幅值接近断层活化阈值时(0.8g),地下裂隙水渗流速度时程曲线表现出强烈的波动性,产生强烈波动性的主要原因是地震引起了裂隙渗流通道宽度的变化.此外地震产生的惯性力也是造成地下水渗流速度变化的原因之一,时间单元内的裂隙水渗流时间曲线同样满足裂隙介质水渗流规律.
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