摘要
在软土地区建设高速公路、铁路等的填筑路堤越来越多,由于软土的不排水抗剪强度较低,软土地区路堤的填筑十分困难,而软土地基的渗透性很低,通常认为路堤的填筑是在不排水条件下进行。经典的设计方法是基于极限平衡法,无法考虑变形等因素,因此,能综合考虑稳定及变形等因素的有限元方法成为分析此类问题的一种有效手段。依据连云港铁路路堤在软土地基上的填筑试验资料,采用大变形有限元方法及Mohr-Coulomb模型,采用现场试验得到的土体强度值,对平面应变条件下路堤填筑的破坏性状及极限填筑高度等进行了分析,并对比了有限元分析结果及现场试验结果,结果表明,采用大变形有限元方法能够较准确的得到填筑路堤的极限高度,并有效地分析填筑路堤的破坏性状。
The need to build embankments on soft clay deposits is widespread, including railway and expressway embankments. The difficulties in constructing embankments on these deposits are well known. The permeability of soft subgrade is usually low, so that construction is generally performed under undrained conditions, as a consequence of the low undrained shear strength of soft clay. The classical design of an embankment is often based on a limit equilibrium approach, in which the deformation factor can not be taken into account, so that the finite element method which can take deformation and stability into account becomes an effective method. Based on the in situ test data of Lianyungang railway embankment built on soft subgrade, the failure behavior and limit height of embankment are analyzed under the plane strain condition by using large deformation finite element method and Mohr-Coulomb model. And the numerical results analyzed by finite element method are compared carefully with the in situ test data. The results show that the limit height and failure behavior of embankment can be obtained by using the large deformation finite element method.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2009年第7期2075-2080,共6页
Rock and Soil Mechanics
基金
中国博士后科学基金项目(No20070411181)资助
关键词
路堤
大变形有限元法
极限高度
破坏性状
embankment
large deformation finite element method
limit height
failure behavior
作者简介
刘开富，男，1977年生，博士，博士后，研究方向为地基处理及地基稳定性。E-mail：kaifu．liu@gmail．com
