降雨入渗对寒旱环境根-土复合体斜坡稳定性的影响  

Infiltration of Rainfall on the Slopes of Root-soil Complexes in Cold and Arid Environments Stability

作　　者：罗元仓 张小荣 高英 LUO Yuan-cang;ZHANG Xiao-rong;GAO Ying(Qinghai Transportation Planning and Design Institute Co.,Ltd.,Xining 810000,China;Department of Civil and Architectural Engineering,City College of Xi’an Jiaotong University,Xi’an 710018,China)

机构地区：[1]青海省交通规划设计研究院有限公司,西宁810000 [2]西安交通大学城市学院土木建筑工程系,西安710018

出　　处：《科学技术与工程》2024年第24期10500-10507,共8页Science Technology and Engineering

基　　金：陕西省自然科学基础研究计划(2021JQ-892)。

摘　　要：为研究降雨入渗对寒旱环境根-土复合体斜坡稳定性的影响,基于室内根-土复合体直剪试验,将根系简化为主根与一级不同倾角侧根组成的二维对称模型,来模拟根-土复合体直剪试验,获得不同倾角侧根的拉力与试样的抗剪强度指标,且基于无限斜坡与降雨I-D模型,对不同倾角侧根穿过潜在滑移面斜坡进行稳定性分析。结果表明:随侧根倾角的增加,前侧根的拉力增加,主根和后侧根拉力变化不明显,大于37.5°时,前侧根拉力逐渐降低;不同垂直压力下,根系构型对土体抗剪强度的贡献依次为前侧根、主根、后侧根;随斜坡潜在滑移面深度的增加,素土及根-土复合体斜坡安全系数急剧下降,且相比素土,根-土复合体斜坡安全系数最大增长约27.01%。研究成果可为寒旱环境的植被生态护坡和水土保持研究提供一定数据参考。In order to study the effect of rainfall infiltration on the stability of root-soil complex slopes in cold and arid environments,based on the indoor root-soil complex straight shear test,the root system was simplified into a two-dimensional symmetric model consisting of the main root and one level of lateral roots with different inclinations to simulate the root-soil complex straight shear test,and the tensile force of lateral roots with different inclinations was obtained along with shear strength indexes of the specimens,and the stability of the slopes with different inclinations was analyzed based on the infinite slopes and the rainfall I-D model for the different inclination of the lateral roots through the based on the infinite slope and rainfall I-D model,the stability analysis of slopes with different inclination of lateral roots across the potential slip surface was carried out.The results show that with the increase of lateral root inclination angle,the tension of front lateral root increases,the main root and back lateral root tension changes insignificantly,and the tension of front lateral root gradually decreases when it is greater than 37.5°.Under different vertical pressures,the contribution of root configuration to the shear strength of the soil body is the front lateral root.The main root,and the back lateral root in the order of the front lateral root.The factor of safety of the vegetative soil and root-soil composite slopes decrease sharply with the increase of the depth of the slope potential slip surface,and compared with the the maximum increase in the slope safety factor of root-soil composite is about 27.01%compared with that of the vegetative soil.The research results can provide some data for the study of vegetation ecological slope protection and soil conservation in cold and arid environments.

关 键 词：根-土复合体 数值模拟 抗剪强度 降雨斜坡稳定性 

分 类 号：U416.14[交通运输工程—道路与铁道工程]