【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。更多还原

【Abstract】 The displacement and velocity of Beichuan soil under rainfall conditions is numerically simulated by FLAC in two-phase fluid and Mohr-Coulomb model,and then a series of model test about rainfall-induced slope failure are performed in laboratory.It is shown that the maximum horizontal displacement occurs at the foot of the slope and the horizontal displacement is the first indicator to measure the slope failure.Moreover,it is suggested that the slope failure can be predicted by a sudden change of displacement at the characteristic point on the slope.There are a good agreement between the simulation results and the model test data.更多还原