软土地区加筋土路基大变形固结有限元分析  

FEA of Large Deformation Consolidation for Reinforced Embankment on Soft Soil

作　　者：蒋鑫[1] 凌建明[1] 邱延峻[2] 

机构地区：[1]同济大学道路与交通工程教育部重点实验室,上海200092 [2]西南交通大学土木工程学院,成都610031

出　　处：《地下空间与工程学报》2008年第1期66-72,共7页Chinese Journal of Underground Space and Engineering

基　　金：中国博士后科学基金资助项目(20060390654)

摘　　要：指出既有软土地区加筋土路基数值分析软件存在着的一些不足与欠缺,基于荷兰土工有限元软件Plaxis,建立软土地区加筋土路基大变形固结有限元精细数值分析模型,考虑更新网格和更新水压,比较大变形固结有限元和小变形固结有限元分析的结果,利用剪切强度折减法,探讨施工全过程中加筋土路基的稳定性及潜在滑动面性态的演变。考虑更新网格和更新水压后,能更真实地反映软土地区加筋土路基的固结沉降性状;筋材的铺设能有效阻滞路堤边坡滑动,为防止工后固结若干年后可能出现的路堤坡面的浅层滑动,应适当加强坡面防护与加固。Some disadvantages and shortcomings of several existed geotechnical software packages used to analyze the reinforced embankment on soft soil are pointed out. Based on finite element program Plaxis, this paper studies the construction simulation of a road reinforced embankment on soft soil using the Updated mesh and Updated water pressure options. The differences between the results of large deformation and small deformation are compared. The use of the Updated mesh and Updated water pressure options allows for a realistic analysis of settlements. The phi-c-reduction calculation option is available in Plaxis to consider not only the final stability but also the stability during the construction of reinforced embankment. The reinforcement is able to prevent the potential embankment side slope sliding. Some advice to prevent embankment slope failure is given.

关 键 词：道路工程 加筋土路基 软土 固结 大变形有限元法 

分 类 号：TU447[建筑科学—岩土工程] TB115[建筑科学—土工工程]