土工格栅加筋昔格达土路堤作用影响要素分析  

Analysis of the Influencing Factors on Geogrid Xigeda Soil Reinforced Embankment Effect

作　　者：王伟[1] 李学伟 WANG Wei;LI Xue-wei(School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China;Department of Civil and Architectural Engineering,Panzhihua University,Panzhihua 617000,China)

机构地区：[1]重庆交通大学土木工程学院,重庆市400074 [2]攀枝花学院土木与建筑工程学院,攀枝花市617000

出　　处：《公路》2020年第11期21-26,共6页Highway

基　　金：四川省教育厅重点项目,项目编号18ZA0750。

摘　　要：昔格达土是四川省安宁河流域广泛存在的一种区域性土,工程性质较为特殊,具有易软化、崩解的特性,不能直接作为软土地基上的路堤填土材料使用。为了研究加筋对昔格达土路堤稳定性的作用效果,采用土工格栅加筋软土地基上的昔格达土路堤,以土工格栅层数、土工格栅模量、昔格达土模量及昔格达土填土高度为影响因素,利用有限元软件ABAQUS对以上不同影响因素作用下的昔格达土加筋效果进行了对比分析。计算分析结果显示,利用土工格栅加筋可显著降低软土地基的水平位移量,提高昔格达土路堤稳定性;增大加筋层数、筋材模量和降低填土高度能有效抑制地基的横向变形,但昔格达土路堤模量的大小对加筋效果影响不大。研究成果对四川攀枝花、西昌地区新建高速公路的设计及施工有一定的指导价值。Xigeda earth is a kind of regional soil widely existing in the Anning River Basin of Sichuan Province.It has special engineering properties and is easy to soften and disintegrate,which generally cannot be directly used as embankment fill material on soft soil foundation.In order to study the effect of reinforcement on the stability of the Xigeda soil embankment,in this paper,Xigeda soil embankment on soft soil foundation reinforced by geogrid is adopted.Taking the number of layers of geogrid,geogrid modulus,Xigeda soil modulus and the filling height of Xigeda soil as influencing factors,the reinforcement effect of Xigeda Soil under different influencing factors is compared and analyzed by using finite element software ABAQUS.The calculation and analysis results show that geogrid reinforcement can significantly reduce the horizontal displacement of soft soil foundation,improve the stability of Xigeda soil embankment,increase the number of reinforcement layers,modulus of reinforcement materials and reduce the filling height can effectively inhibit the lateral deformation of foundation,but the magnitude of Xigeda soil embankment modulus has little influence on the reinforcement effect.The research results have certain guiding value for the design and construction of new expressways in Panzhihua and Xichang areas of Sichuan.

关 键 词：昔格达土 软土地基 路堤 土工格栅 加筋效果 

分 类 号：U416.1[交通运输工程—道路与铁道工程]