基于正交试验设计的路堤下地基沉降影响因素显著性分析  

Influencing factors significance analysis of foundation subsidence under embankment based on orthogonal design

作　　者：宋鑫[1] 罗强[1] 熊勇[1] 崔耀璞[1] 

机构地区：[1]西南交通大学高速铁路线路工程教育部重点实验室,四川成都610031

出　　处：《铁道建筑》2015年第12期84-87,92,共5页Railway Engineering

基　　金：国家重点基础研究发展计划资助项目(2013CB036204)

摘　　要：为研究路堤下地基沉降影响因素的显著性,采用等水平正交表进行正交试验设计,建立了地基沉降理想弹塑性有限元分析模型,通过计算路堤填土重力作用下的地基沉降及塑性变形,分析了在高低两种地基土强度条件下地基土的变形模量、内摩擦角、黏聚力、重度和路堤高度、填土变形模量、填土重度7种因素对地基沉降影响的主次关系。分析结果表明:对地基沉降影响最为显著的因素是地基土变形模量和路堤高度;随着地基土强度的降低,地基土的塑性变形增加明显,地基土内摩擦角对地基沉降的影响程度凸显,其显著性明显超过路堤填土重度与地基土黏聚力;对地基土的塑性变形而言,地基土内摩擦角的显著性大于地基土变形模量、路堤高度等因素,影响程度最为显著。研究成果可为地基沉降分析与工后沉降控制提供参考。In order to investigate the significance ofinfluencing factors of foundation subsidence under embankment,an ideal elastic-plastic finite element analysis model of foundation subsidence was built to do orthogonal designed by orthogonal table. The significance of seven influencing factors of foundation subsidence under embankment which include elastic modulus,internal friction angle,cohesive force,foundation soil density and elastic modulus,height,embankment filling density was analyzed by calculating the subsidence and plastic deformation of foundation under embankment gravity. The analysis results shows： The foundation elastic modulus and embankment height are the two most important influencing factors for foundation subsidence. With the decreasing of foundation soil strength,plastic deformation is obviously increasing. At the same time,the friction angle has a prominent effect on the foundation subsidence,which has higher significance obviously compared to the embankment filling density and the cohesive force of foundation soil. For plastic deformation of foundation soil,the significance ofinternal friction angle is greater than any other factors. This research could provide references for the foundation subsidence analysis and subsidence control after construction.

关 键 词：地基沉降 正交试验设计 地基塑性变形 显著性分析 

分 类 号：U213.1[交通运输工程—道路与铁道工程]