降雨是诱发边坡失稳的主要因素,为研究长时间降雨工况下,亚黏土路堤边坡的稳定性,提出综合考虑基质吸力变化、重度修正以及软化效应的修正饱和-非饱和抗剪强度理论；利用Geo-studio中的seep模块模拟渗流,再将渗流计算结果导入FLA C3D,利用FLA C3D内置的fish语言编程反映边坡的重度变化、基质吸力变化、软化效应。研究结果表明：(1)随降雨时间的增加边坡内部水位线从坡脚逐渐上升且坡脚处水位线上升的速率大于路基中心线处水位线上升的速率；(2)降雨过程中,边坡内水位线以下的基质吸力逐渐消散并逐渐转变为正孔隙水压力；(3)随降雨的持续进行,边坡逐渐变为失稳状态。%Rainfall is the main factor that affects the stability of slope. In order to analyse sub clay embankment slope stability under the condition of the long-term rainfall infiltration, took matric suction dissipation, severe correction and softening effect into consideration and came up with the corrected saturated-unsaturated shear strength theory. Use the seep module of geo-studio to simulate seepage and introduce the seepage calculation results into FLAC3D. Fish language was used to reflect the effect of matric suction dissipation, softening effect. The results show that: (1) with the duration of rainfall increased, slope internal water line increased gradually from the foot of the slope and the foot of the slope water level rising rate is greater than the roadbed along the centerline of the water level rising rate. (2)During the process of rainfall infiltration, the slope’s matric suction dissipate into positive pore water pressure;(3)with rainfall infiltration going on, slope gradually changed into unstable state.
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