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以某厚堆积层滑坡为例,基于非饱和土力学理论,利用有限元方法,对雨水入渗条件下坡体的渗流及动态稳定性进行了计算和分析,研究了水分在坡体内的运移对边坡稳定性的时间效应。结果表明:边坡堆积体结构松散,土体强度差,边坡前缘坡降大,坡脚的开挖,为滑坡形成提供了便利条件;强降雨条件下使得坡脚附近首先发生变形失稳,牵引坡体后缘产生张拉裂。雨水沿坡面入渗,在坡体内形成渗流场,弱化岩土体参数,同时坡面形成饱和径流,使滑坡体前缘产生向下的渗透力,促使前缘坡体发生滑动,进而引发分级坡体产生滑移;强降雨初始阶段,滑坡体安全系数降低较快,很容易发生滑坡。该研究揭示了降雨入渗诱发厚堆积层边坡滑动机制,并以此建议采取以截、排、堵措施对边坡进行排水,同时设置嵌岩锚索抗滑桩及进行削坡清方措施对边坡进行综合治理,通过稳定性计算,效果良好。
Taking a thick buildup landslide as an example, based on the unsaturated soil mechanics theory, the finite element method is used to calculate and analyze the seepage and dynamic stability of slope under rainfall infiltration. Time effect on slope stability. The results show that the structure of the slope is loose, the strength of the soil is poor, the front slope of the slope is decreased, and the excavation of the slope foot provides a convenient condition for the landslide formation; under the condition of heavy rainfall, the deformation instability , Pulling the trailing edge tension fracture. The infiltration of rainwater along the slope, the formation of seepage field in the slope body weakens the parameters of the soil and soil, and at the same time, the saturated runoff forms on the slope surface, resulting in downward penetration of the front edge of the landslide body, leading to slip of the front slope body, Sliding body slips; in the initial stage of heavy rainfall, the safety factor of landslide decreases rapidly and landslides are prone to occur. This study revealed the slip mechanism induced by rainfall infiltration on the slope of thick buildup slopes. Based on this, it is suggested that the slope drainage should be carried out by means of cut-off, drainage and blockage measures, anti-slide piles embedded with rock anchors and clear-cut measures Comprehensive management of the slope, through the stability calculation, the effect is good.