新填土性质对新旧路基变形的影响因素研究  

Effects of New Fill Properties on Differential Deformation between New and Existing Embankment

作　　者：刘延祥 徐文[1,2] LIU Yanxiang;XU Wen(School of Transportation,Wuhan University of Technology,Wuhan 430063,China;Hubei Highway Engineering Research Center,Wuhan 430063,China)

机构地区：[1]武汉理工大学交通学院,武汉430063 [2]湖北省公路工程技术研究中心,武汉430063

出　　处：《交通科技》2019年第1期11-15,共5页Transportation Science & Technology

摘　　要：为探究旧路扩建中新填土性质对新旧路基差异变形的影响,通过ABAQUS有限元软件建立旧路扩建模型,计算路基顶面的横向位移与竖向位移,并探究新旧路基差异变形特性,采用正交实验法对新填土重度、压缩模量、内摩擦角以及黏聚力共4种因素进行研究分析。结果表明:道路拓宽后,新旧路基坡脚下的地基均发生了相对集中的横向位移,最大横向位移产生在路基结合部处附近,旧路基会向上隆起,并且最大竖向位移发生在新路基中心靠近边缘的位置;填土性质对新旧路基横向与竖向位移影响的重要性顺序为:重度>压缩模量>内摩擦角>黏聚力,因此,改扩建工程中,应在合理范围内选择重度较小、压缩模量较大的路基填土来减小新旧路基差异变形。In order to explore the effects of new fill properties on differential deformation between new and existing embankment in widening engineering,the old road expansion model was built by using ABAQUS finite element software,the lateral displacement and vertical displacement of the embankment top surface were calculated,and the differential deformation between new and existing embankment was explored.Four factors of new fill properties,including the soil density,compressive modulus,internal friction angle and cohesive force,were studied by orthogonal experiments.The results show that after widening the road,the lateral displacements of the foundation between new and existing embankment are relatively concentrated.The maximum lateral displacement is generated near the junction of the embankment.The old embankment will rise upward,and the maximum vertical displacement will occur near the center of the new embankment.The importance of the soil property on the lateral and vertical displacements between the new and old embankment is different(soil density >compression modulus >internal friction angle >cohesive force).So in the widening engineering,the filling with smaller density and larger compression modulus should be selected to reduce the differential deformation between new and existing embankment within a reasonable range.

关 键 词：旧路扩建 填土性质 有限元分析 路基变形 正交试验设计 

分 类 号：U416.1[交通运输工程—道路与铁道工程]