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地震动作用下边坡的安全系数是一个波动值,如何获取边坡的地震动动态安全系数是边坡抗震稳定性分析中的重点和难点问题。基于FLAC3D建立了三维边坡模型,在该模型中设置监测点,对其进行动力时程响应分析。然后通过对Fish语言的二次开发,获取了边坡在不同时刻的位移、应力、速度、加速度场和边界条件信息,自动生成了包含地震动动力响应特性的边坡模型。在此基础上,采用有限差分强度折减法计算边坡安全系数,获得地震过程中边坡安全系数变化曲线。工程实例计算结果表明本文中提出的方法的计算结果是有效的,为边坡抗震稳定性分析提供了科学依据。
The safety factor of slope under earthquake action is a fluctuating value. How to obtain the dynamic safety factor of slope seismic activity is the key and difficult problem in the analysis of seismic stability of slope. Based on FLAC3D, a three-dimensional slope model is established, and the monitoring points are set up in this model to analyze the dynamic time history response. Then, based on the secondary development of Fish language, the displacement, stress, velocity, acceleration field and boundary condition information of slope at different times are obtained, and the slope model including dynamic response characteristics of earthquake is automatically generated. On this basis, the slope safety factor is calculated by the finite difference strength reduction method, and the curve of the slope safety factor during the earthquake is obtained. The calculation results of engineering examples show that the proposed method is effective and provides a scientific basis for slope stability analysis.