摘要
为探究降雨及水位骤降作用下膨胀土边坡换填加固效果,以南京秦淮东河一期工程典型膨胀土边坡断面为研究对象,分析了水泥改良膨胀土的可行性,并基于FLAC3D软件建立了有限差分边坡模型,对不同换填深度及工况下膨胀土边坡的水分场和稳定性开展了分析。研究结果表明:换填法加固表层膨胀土可提高土体强度、减少降雨入渗量从而显著提高边坡稳定性;边坡安全系数与换填深度呈非线性关系,换填深度较小时,边坡发生局部浅层滑动,通过增加换填深度可使得滑动面下移并过渡到深层整体滑动,这一过程中边坡安全系数随换填深度的提高迅速增加,当潜在滑动面上不存在裂隙膨胀土时,边坡稳定性几乎不受换填深度影响。
To explore the replacement and reinforcement effect of expansive soil slopes under rainfall and sudden water level drop,the typical expansive soil slope section of the first-phase project of Nanjing Qinhuai East River is taken as the research object.The feasibility of cement-modified expansive soil is analyzed,and a finite difference slope model is established based on FLAC3D software.The moisture field and stability of expansive soil slopes under different replacement depths and working conditions are analyzed in this study.The research results show that:Reinforcement of surface expansive soil by replacement method can improve soil strength,reduce rainfall infiltration,and thus significantly enhance slope stability;the safety factor of the slope has a non-linear relationship with the replacement depth.When the replacement depth is small,local shallow sliding occurs in the slope.Increasing the replacement depth can cause the sliding surface to move downward and transition to deep overall sliding.During this process,the slope safety factor increases rapidly with the increase of replacement depth.When there is no fractured expansive soil on the potential sliding surface,slope stability is hardly affected by the replacement depth.
作者
李强
蔡舒凌
俞翔
张福海
刘峥嵘
LI Qiang;CAI Shuling;YU Xiang;ZHANG Fuhai;LIU Zhengrong(Nanjing Chengming Construction Consulting Co.,Ltd.,Nanjing 210012,China;Nanjing Urban Construction Management Group Co.,Ltd.,Nanjing 210006,China;Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing 210098,China;Engineering Research Center of Dredging Technology of Ministry of Education,Hohai University,Changzhou 213022,China)
出处
《江苏水利》
2025年第8期49-57,共9页
Jiangsu Water Resources
基金
国家自然科学基金资助项目(51778211)。
关键词
膨胀土边坡
降雨
改良土换填
边坡稳定性
有限差分法
expansive soil slope
rainfall
improved soil replacement
slope stability
finite difference method
