考虑雨水重分布对均质无限长边坡稳定性的研究  

Rainwater redistribution on stability of homogenous infinite slope

作　　者：韩同春[1,2] 豆红强[1] 马世国[1] 王福建[3] 

机构地区：[1]浙江大学滨海和城市岩土工程研究中心,浙江杭州310058 [2]浙江大学软弱土与环境土工教育部重点实验室,浙江杭州310058 [3]浙江大学交通工程研究所,浙江杭州310058

出　　处：《浙江大学学报（工学版）》2013年第10期1824-1829,共6页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(51178423);浙江省重点科技创新团队经费资助项目(2010R50034)

摘　　要：建立反映雨水入渗及重分布的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入渗量的增加而逐渐降低,并最终趋于平缓.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.

关 键 词：无限长边坡 雨水重分布 Green—Ampt模型 边坡稳定性 滞后性 

分 类 号：TU443[建筑科学—岩土工程]