摘要
Abstract
In order to understand the slide promoting mechanism of loess subgrade fill slope under rainfall condition,the numerical simulation of rainfall was carried out on the roadbed fill slope of Highway G310,and the responses of parameters such as pore water pressure,effective saturation and displacement were analyzed.with the increase of time,the safety factor of the slope changes slowly at the initial stage of rainfall,and decreases continuously with the continuous infiltration of rainfall,and changes greatly during 8～24 hours.The decreasing trend is significant,and then it does not change much.The sliding promotion mechanism is summarized as follows:The strength of loess fill slope deteriorates in the process of rainfall,coupled with the accumulation of water at the top and foot of the slope,the back edge of the slope first produces settlement and deformation,and the suction of the soil at the foot of the slope is gradually lost,followed by wet shear failure,so that the stress of the soil in the slope is adjusted to promote the penetration of the plastic zone,thus resulting in the collapse of the slope.关键词
强度劣化/黄土路基/填方边坡/安全系数/促滑机理Key words
strength deterioration/loess roadbed/fill slope/safety factor/slip promotion mechanism分类
建筑与水利
