降雨类型对不同坡角与土体边坡动态稳定性的影响
A Simulation Study of Rainfall Type on Dynamic Stability of Different Slopes
吕江涛1
作者信息
- 1. 中铁十八局集团第五工程有限公司,辽宁 沈阳 110000
- 折叠
摘要
降雨是引起边坡失稳的最常见因素,为探究降雨类型对边坡稳定性的作用机理,确保边坡安全稳定,采用Geo-studio有限元分析软件,对处于不同降雨类型下、不同坡度和土体的边坡稳定性进行分析.结果表明:1)在边坡表面土体饱和前,降雨强度对边坡安全稳定系数的影响占据主导地位,降雨强度越大,边坡安全稳定系数下降越快,土体饱和后则基本无影响;2)边坡坡角对边坡稳定性变化的影响主要体现在降雨末期,此时,边坡表面土体由饱和向非饱和转换,边坡坡角越小边坡安全稳定系数回升越快;3)降雨类型对于不同土体的边坡安全稳定系数的影响各不相同,其中在渗透系数较大的砂土边坡上表现得更为明显;4)在强降雨时,边坡土体的渗透系数越大,边坡稳定系数下降幅度也越大;但当边坡土体渗流速率足够大,边坡表层土体的水能及时渗流到边坡内部土体时,降雨对边坡稳定性的影响也会大大减小.
Abstract
Rainfall is the most common factor causing slope instability.In order to explore the action mechanism of rainfall types on slope stability and ensure slope safety and stability,a geo-studio finite element analysis software was used to analyze slope stability of different slopes and soils under different rainfall types.The results show that:1)Before the saturation of soil on the slope surface,the influence of rainfall intensity on the safety and stability coefficient of slope is dominant.The greater the rainfall intensity,the faster the safety and stability coefficient of slope decreases;When the soil is saturated,it has little effect.2)The influence of edge slope Angle on slope stability changes mainly comes at the end of rainfall.At this time,the soil surface of slope changes from saturated to unsaturated,and the smaller the edge slope Angle,the faster the slope safety stability coefficient rises.3)The influence of rainfall types on the safety and stability coefficients of slopes with different soils varies.Among them,the influence is more pronounced on sandy slopes with greater permeability.4)In the case of heavy rainfall,the greater the permeability coefficient of slope soil,the greater the decline of slope stability coefficient.
关键词
降雨类型/边坡稳定性/孔隙水压力/安全稳定系数Key words
Rainfall types/Slope stability/Pore water pressure/Safety and stability factors引用本文复制引用
出版年
2025
NETL
NSTL
万方数据