土工格栅处理道路拓宽的理论与数值分析  

Theoretical & Numerical Analysis of Geogrid Treatment on Road Widening

作　　者：孙玲[1] 郑俊杰[1] 马强[2] 

机构地区：[1]华中科技大学土木工程与力学学院,湖北武汉430074 [2]湖北工业大学土木工程与建筑学院,湖北武汉430068

出　　处：《中国市政工程》2014年第4期86-89,113,共4页China Municipal Engineering

基　　金：国家自然科学基金项目(50978112);教育部留学回国人员科研启动基金资助项目(20091341)

摘　　要：道路拓宽工程中如果对新老路基交界处理不当,极易引起路基路面的各种病害,采用土工格栅对新老路堤交界面处进行处理可以提高路基的整体稳定性,减少新老路堤间的不均匀沉降。在对道路拓宽工程常见病害及产生原因分析的基础上,介绍格栅的工作机制,给出格栅加固长度的估算表达式。利用PLAXIS软件进行有限元分析,计算中对筋土界面采用基于摩尔库伦准则的接触单元,分析路堤填筑完成时上下层格栅的拉力和位移以及路面施加不同等级的荷载时格栅的拉力。通过改变格栅与土界面单元的作用发挥系数,分析对格栅拉力以及路面侧向位移以及沉降的影响。It will result in different damages of embankment pavement easily if there are improper treatment measures on old & new embankment bordering of road widening project. Adopting geogrid for old & new embankments bordering treatment can raise the whole stability of embankment and to reduce differential settlement between old & new embankments. Based on the investigation on the causes to common damages of road widening project, the working mechanism of geogrid is introduced, and the estimating expression for the geogrid reinforcement length is given. Finite element analysis is made by software PLAXIS. During the calculation, contact element based on Mohr Coulomb criterion is adopted for reinforced soil interface. Tension forces & displacements of geogrid up & down layers are analyzed when embankment filling is completed; and geogrid tension forces under different pavement load are also analyzed. The geogrid tension, lateral displacement of the pavement and the settlement influences are analyzed by changing the functional influencing coefficient of geogrid & soil interface unit.

关 键 词：道路拓宽 数值模拟 土工格栅 位移 

分 类 号：U418.8[交通运输工程—道路与铁道工程]