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针对目前边坡稳定性分析方法中把降雨入渗与地震作用隔开分析的特点,为了使稳定性分析方法更加接近于实际,考虑降雨非饱和边坡动力稳定性分析方法被提出。首先,将土质边坡简化为一维入渗模型,按非饱和土力学中的公式来定义基质吸力和饱和度的关系;其次,在动力分析方面,只考虑水平地震作用及其地震最不利工况,假设地震时土中的动土压力沿坡高分布呈倒三角形分布,采用拟静力法施加动力荷载;再次,利用ABAQUS软件进行仿真分析。从计算实例来看,动力作用下的边坡稳定性下降较大。
In order to separate the rainfall infiltration and the earthquake from the analysis of the current slope stability analysis method, in order to bring the stability analysis method closer to reality, a dynamic stability analysis method considering the unsaturated rainfall slope is proposed. Firstly, the soil slope is simplified into a one-dimensional infiltration model, and the relationship between the matric suction and saturation is defined according to the formula in unsaturated soil mechanics. Secondly, in the dynamic analysis, only the horizontal seismic action and the most unfavorable earthquake It is assumed that the earth-moving pressure in the soil is inverted triangular distribution along the slope height distribution, and the dynamic load is imposed by quasi-static method. Thirdly, the simulation analysis is carried out by ABAQUS software. From the calculation example, the stability of the slope under the action of power is greatly reduced.