摘要
本文研究结合万里小流域水土保持治理项目,通过Geo-Studio软件建立边坡模型,研究分析降雨条件下边坡渗流场、应力场、位移场等变化规律。结果表明:边坡土体孔隙水压力随着降雨时长的增加,土体受影响范围逐渐增大,边坡内部饱和区不断扩大;边坡中上部剪应力等值线平行于坡顶,随着降雨的持续,坡表剪应力显著增加,对应的等值线也呈凸型,坡脚处应力集中点也逐渐增加;在降雨前期,坡表处剪应变等值线分布密集,中期坡顶处剪应变向坡脚处扩展,后期坡体内部剪应变已贯通坡顶与坡脚,形成的贯通带亦表征着边坡失稳潜在的滑坡面。
In this study,combined with the water and soil conservation and control project of Wanli small watershed,the slope model is established through geo Studio software to study and analyze the variation laws of slope seepage field,stress field and displacement field under rainfall conditions.The results show that the pore water pressure of slope soil increases with the increase of rainfall time,the affected range of soil gradually increases,and the saturated area inside the slope continues to expand;The isoline of shear stress in the middle and upper part of the slope is parallel to the top of the slope.With the continuous rainfall,the shear stress on the slope surface increases significantly,the corresponding isoline is also con vex,and the stress concentration point at the foot of the slope also increases gradually;In the early stage of rainfall,the isolines of shear strain at the slope surface are densely distributed,the shear strain at the top of the slope extends to the foot of the slope in the middle stage,and the internal shear strain of the slope body has penetrated through the top and foot of the slope in the later stage,and the formed through zone also represents the potential landslide surface of slope instability.
作者
张乾坤
Zhang Qiankun(Zezhou County Water Affairs Bureau Zezhou County Water Conservancy Development Center,Zezhou,Shanxi 048000,China)
出处
《山西水土保持科技》
2022年第1期13-16,共4页
Soil and Water Conservation Science and Technology in Shanxi
关键词
降雨
非饱和土
数值模拟
渗流-应力耦合
边坡稳定性
Rainfall
Unsaturated soil
Numerical simulation
Seepage stress coupling
Slope stability
