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中文摘要：
本文采用FLAC的两相流模式和修正的Mohr—Coulomb模型，对北川地区震后土在降雨条件下的位移和速度矢量进行了数值模拟和分析，同时在室内进行了降雨条件下斜坡破坏的模型实验。分析结果表明：土体在沿坡面的最大水平位移发生在坡脚处，土体水平位移是衡量斜坡破坏的首要指标，可采用坡面特征点的位移突变作为斜坡破坏的判别标准；数值模拟得到的斜坡破坏与降雨历时关系与室内模型实验结果吻合较好。
英文摘要：
The displacement and velocity of Beichuan soil under rainfall conditions is numerically simulated by FLACin two-phase fluid and Mohr-Coulomb model, and then a series of model test about rainfall-induced slope failure areperformed in laboratory. It is shown that the maximum horizontal displacement occurs at the foot of the slope and thehorizontal displacement is the first indicator to measure the slope failure. Moreover, it is suggested that the slopefailure can be predicted by a sudden change of displacement at the characteristic point on the slope. There are a goodagreement between the simulation results and the model test data.
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