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.
出处
《浙江大学学报（工学版）》
EI
CAS
CSCD
北大核心
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)
