深厚软土路堤变形及地基处理研究  

Research on Deformation and Foundation Treatment of Deep Soft Soil Embankment

作　　者：谭贝 Tan Bei(Shanxi Jiaoke Highway Survey and Design Institute Co.,Ltd.,Taiyuan 030032,China)

机构地区：[1]山西交科公路勘察设计院有限公司,太原市030032

出　　处：《北方交通》2024年第2期48-51,55,共5页Northern Communications

摘　　要：以某公路工程软土地基处理为研究对象,提出了针对性地基处治方案,并利用Midas GTS NX有限元软件进行地基沉降数值模拟分析。分析结果表明:预应力管桩+固化土组成的复合地基能够有效减少地基沉降,固化土能够形成支撑平台,将路堤荷载通过预应力管桩传递到地下持力层,减少地表沉降;地表沉降随时间变化呈现出“前期快、中期缓、后期慢”的逐渐增大的变化趋势;减小桩间距、增大固化土厚度及弹性模量均能减少地表沉降,地表沉降值对弹性模量变化的敏感程度比桩间距及固化土厚度更小。Taking the soft soil foundation treatment of a highway project as the research object,the targeted foundation treatment scheme is put forward,and the numerical simulation analysis of the foundation settlement is made by using Midas GTS NX finite element software.The analysis results show that:the composite foundation composed of the prestressed pipe pile and solidified soil can effectively reduce the foundation settlement,and the solidified soil can form a supporting platform to transfer the embankment load to the underground bearing layer through the prestressed pipe pile,and reduce the earth surface settlement;the earth surface settlement shows a gradually increasing trend with time,which is"fast in the early stage,moderate in the middle stage,and slow in the later stage";reducing the spacing between piles,and increasing the thickness and elastic modulus of solidified soil can all reduce the earth surface settlement,and the sensitivity of the earth surface settlement value to changes in elastic modulus is smaller than that of pile spacing and solidified soil thickness.

关 键 词：软土地基 施工方案 数值模拟 沉降变形 弹性模量 

分 类 号：U416.12[交通运输工程—道路与铁道工程]