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为了研究排土场层状碎石土边坡在持续暴雨条件下的入渗过程及稳定性,推导了土体天然含水率、天然重度与天然体积含水量的换算公式,作为快速确定边坡土体初始基质吸力分布的依据.建立算例排土场有限元分析模型,进行降雨条件下饱和-非饱和渗流、孔压-应力耦合以及边坡稳定分析.结果表明:持续暴雨作用下排土场会在透水性最强的边坡浅层形成集中渗流通道,当坡底存在弱透水性土层时会切断渗流通道,导致雨水从坡脚涌出;排土场边坡位移在降雨期间不断增长,但增长速度越来越慢,雨后边坡位移立即开始减小;降雨初期边坡稳定性系数下降较快,边坡浅层渗流稳定后基本保持不变,雨后缓慢增大.排土场层状碎石土边坡在持续暴雨作用下容易在降雨中后期失稳.
In order to study the infiltration process and stability of layered gravelly soil slopes under continuous heavy rain conditions, the formulas for calculating natural water content, natural heavy volume and natural volumetric water content of soil are derived, According to the foundation of initial matrix suction distribution of body, a finite element analysis model of the example dump was established to analyze the saturated-unsaturated seepage, pore pressure-stress coupling and slope stability analysis under the condition of rainfall. The results show that under the condition of continuous heavy rain, A concentrated seepage channel is formed in the shallow water layer with the highest water permeability, and the seepage channel is cut off when there is a weakly permeable soil layer at the bottom of the slope, resulting in rainwater pouring out from the foot of the slope. The displacement of the dump slope increases during the rainfall , But the growth rate was slower and slower. The slope displacement immediately began to decrease after the rain. The slope stability coefficient decreased rapidly at the beginning of rainfall, remained unchanged after the shallow seepage flow stabilized, and slowly increased after the rain. The layered gravelly soil slope is prone to instability in the later period of rainfall in the continuous heavy rain.