基于流固耦合的加筋膨胀土边坡稳定性分析  

Stability Analysis of Reinforced Expansive Soil Slope based on Fluid-solid Interaction

作　　者：韦秉旭[1] 曾警 程聪 陈楚方 王起 WEI Bing-xu;ZENG Jing;CHENG Cong;CHEN Chu-fang;WANG Qi(School of Transportation Engineering,Changsha University of Science&.Technology,Changsha410114,China;Luqiao Design and Research Institute,China Highway Engineering Consulting Group Co.Ltd.,Wuhan 430023,China;Guangxi Road Construction Engineering Group Co.Ltd.,Nanning 530029,China)

机构地区：[1]长沙理工大学交通运输工程学院,长沙市410114 [2]中国公路工程咨询集团有限公司路桥设计研究院分公司,武汉市430023 [3]广西路建工程集团有限公司,南宁市530029

出　　处：《公路》2024年第9期8-15,共8页Highway

基　　金：国家自然科学基金项目,项目编号52178413;湖南省自然科学基金项目,项目编号2018JJ2431。

摘　　要：土工格栅加筋膨胀土边坡受降雨影响产生膨胀变形,乃至失稳破坏,是典型的流固耦合问题。为探究降雨条件下加筋膨胀土边坡稳定性,基于流固耦合、饱和-非饱和渗流理论和Biot固结理论,利用FLAC3D二次开发平台和内置FISH语言,构建了一种综合考虑膨胀土渗流-变形-应力的流固耦合分析方法。然后,结合实际工程,基于FLAC3D软件探究了降雨条件格栅界面参数、加筋长度和加筋间距对于边坡稳定性的影响。结果表明:格栅加筋可有效提高边坡稳定性;随着格栅界面参数、加筋长度的增大,以及加筋间距的减小,边坡稳定性逐渐提高;“下密上疏”的格栅布设方案比均匀布设方案更为合理。It is a typical fluid-solid coupling problem that geogrid-reinforced expansive soil slope produces swelling deformation and even instability failure under the influence of rainfall.In order to explore the stability of reinforced expansive soil slope under rainfall,firstly,based on the fluid-solid coupling,saturated-unsaturated seepage theory and Biot consolidation theory,a fluid-solid coupling analysis method which comprehensively considers the seepage-deformation-stress of expansive soil is constructed by using the FLAC3D secondary development plaform and the built-in FISH language.Secondly,combined with the actual project,based on FLACsD software,the impact of various interface characteristic parameters,reinforcement length,and reinforcement spacing of geogrid on slope stability during rainfall events are studied.The results show that geogrid reinforcement can effectively enhance slope stability;with the increase of interface characteristic parameters and reinforcement length of geogrid,and the decrease of reinforcement spacing,the slope stability is gradually improved;and the grid layout scheme.of“dense at the bottom and sparse at the top”is more reasonable than the uniform layout scheme.

关 键 词：边坡稳定性 流固耦合 膨胀土 土工格栅 

分 类 号：U416.14[交通运输工程—道路与铁道工程] U417.115