路基工程Issue(6)：59-65,7.DOI:10.13379/j.issn.1003-8825.202303031
降雨工况下超高黄土边坡稳定性分析
Stability Analysis of Ultra-high Loess Slopes under Rainfall Condition
摘要
Abstract
Along the highway from Wuqi,Shaanxi to Huachi,Gansu,there have many ultra-high loess slopes with the maximum height up to 151.7 m.The overlying new loess is of low strength and collapsible,so it has self-weight collapsibility.Considering that the rainfall in this area is concentrated in summer and occasional rainstorm is likely to cause landslide and other slope failure problems,the stability analysis of the slope was carried out.The GNSS-based slope surface displacement monitoring system and rainfall monitoring system were set on site to get the remote data on surface deformation and rainfall.Next,a numerical model analyzing the slope stability was established to carry out numerical simulation under different rainfall conditions.The monitoring result shows that the loess slope has no excessive displacement and deformation during the monitoring process,the deformation of loess slope is in a safe state.The numerical simulation result shows that,when rainfall intensity remains unchanged,the increase of rainfall duration will have an effect on the stability coefficient of slope;when rainfall duration remains unchanged,the greater the rainfall intensity,the smaller the pore water pressure on the slope surface with smaller shear strength,leading to decreased stability coefficient of slope and a tendency of instability.After the rainfall,the safety coefficient gradually recovers,but is lower than that before the rainfall.关键词
边坡稳定性/数值模拟/降雨工况/安全系数/边坡监测Key words
slope stability/numerical simulation/rainfall condition/safety coefficient/slope monitoring分类
交通工程引用本文复制引用
汤鹏举,阙宏宇,王诗元,魏静..降雨工况下超高黄土边坡稳定性分析[J].路基工程,2023,(6):59-65,7.基金项目
北京交通大学大学生创新创业训练计划支持项目(220130023) （220130023）
