中文摘要：

建立反映雨水人渗及重分布的Green—Ampt扩展模型，求解坡体内雨水重分布的含水率．基于Fredlund非饱和土抗剪强度理论的极限平衡法，建立无限长边坡安全系数与雨水累积入渗量以及雨水重分布持时的关系．通过与数值模拟结果的对比验证模型在边坡稳定性计算中的合理性．从雨水重分布的角度阐释滑坡滞后性的机理．结果表明，边坡的安全系数随雨水重分布持时以及前期累积人渗量的增加而逐渐降低，并最终趋于平缓．

英文摘要：

Abstract. The extended Green-Ampt model was established to solve the distribution of moisture content in the homogenous soil slopes after rain. Then the relationship between the safety factor of the infinite slope and the cumulative infiltration and the time of rainwater redistribution was established based on the Mohr- Coulomb failure criterion of unsaturated soils. The numerical simulation results show that the model of rainwater redistribution can reasonably analyze the slope stability. The mechanism of landsides hysteresis was interpreted from the perspective of rain infiltration and redistribution. Results show that the safety factors of landslides decrease with the increase of the duration of redistribution and accumulative infiltration, eventually reach stable values.