降雨条件下植被型公路边坡的稳定性研究  

Study on stability of vegetated highway slope under rainfall condition

作　　者：刘英朴 任权 LIU Ying-pu;REN Quan(Shaanxi Provincial Transport Planning Design and Research Institute,Xi’an,710065)

机构地区：[1]陕西省交通规划设计研究院有限公司,陕西西安710065

出　　处：《地下水》2024年第3期270-274,共5页Ground water

摘　　要：植被边坡的稳定性与其含根土体的抗剪强度密切相关,主要受根系和水分的影响。本研究通过直剪试验获取了含根量和含水率与根土复合体抗剪强度的关系,简化含根土的边坡为双层土边坡,利用数值模拟研究不同降雨工况下坡体内孔隙水压力变化和边坡稳定性。得出以下结论:刺槐根系有增强土体抗剪强度的作用,抗剪强度随含水率的增大而降低。不同降雨条件下,边坡表层孔隙水压力的变化基本一致,当降雨强度小于土体入渗能力时,随着降雨强度与持时的增加,孔隙水压力逐渐增大。不同降雨条件对于表层孔隙水压力均有影响,只是程度不同,暴雨影响最大,小雨影响最小。降雨使得边坡的安全系数降低,降雨强度越大,安全系数降低的幅度越大。该研究对于降雨条件下植被型公路边坡的稳定性研究和防灾减灾有一定的参考价值。The stability of vegetation slope is closely related to the shear strength of root-soil composite,which is mainly affected by root action and water action.In this study,the relationship between root content,water content and shear strength of root-soil composite was obtained by direct shear test.The slope with root soil was simplified as a double-layer soil slope.Numerical simulation was used to study the change of pore water pressure and the stability of slope under different rainfall conditions.The results show that the roots of ribinia pseudoacacia can significantly enhance the shear strength of soil,and the shear strength decreases rapidly with the increase of water content.Under different rainfall conditions,the change of pore water pressure on the slope surface is basically the same.When the rainfall intensity is less than the soil infiltration capacity,the pore water pressure increases with the increase of rainfall intensity and rainfall duration.Different rainfall conditions have an effect on surface pore water pressure,but the degree is different.Heavy rain has the greatest effect and light rain has the least effect.The safety factor of the slope decreases due to the rainfall,and the greater the rainfall and the higher the rainfall intensity,the greater the reduction of the safety factor,which affects the stability of the slope.This study has some reference value for the stability research and disaster prevention and mitigation of vegetation highway slope under rainfall conditions.

关 键 词：刺槐 降雨 根土复合体 抗剪强度 边坡稳定性 

分 类 号：U416.14[交通运输工程—道路与铁道工程] S157.1[农业科学—土壤学]