降雨类型对土质边坡渗透稳定性影响分析

Study on influence ofrainfall type on seepage stability of soil slope

为研究不同降雨类型对不同进气值土质边坡的渗流特征以及稳定性的影响规律,本文利用Geo-studio软件,计算了边坡上部断面和下部断面四种降雨类型(平均型,前锋型,中锋型,后锋型)下不同进气值的孔压变化,得出了边坡安全系数的变化规律。结果表明:边坡上部断面和下部断面孔压变化规律不同;不同降雨影响了土体表层孔压的变化规律,对深部孔压分布影响不大;不同进气值影响了孔压深部的分布;安全系数呈现持续下降的趋势,进气值对安全系数的影响要大于降雨类型。

In order to study the influence of different rainfall types on the seepage characteristics and stability of soil slope with different air entry values, pore water pressure of different air entry values are calculated under four kinds of rainfall types（the average type, forward type, center type, front type）with Geo studio, and the variation curve of slope safety factors are obtained. Results show that the change law of pore pressure at the upper section and lower section of slope is different; the variation of pore water pressure on the surface of soil is affected by different rainfall types, but it has little effect on the distribution of deep pore pressure; the distribution of deep pore water pressure is affected by different air entry values; the safety factor shows a downward trend, the influence of air intake value on safety factor is greater than rainfall type.