海域扩宽公路的变形特征及数值模拟分析  

Analysis on Deformation in Highway Widening and Numerical Simulation

作　　者：陈庚[1,2] 王波[1,2] 陈永辉[1,2] 陈龙[1,2] 赵子荣[1,2] 

机构地区：[1]河海大学岩土工程科学研究所,南京210098 [2]河海大学岩土力学与堤坝工程教育部重点实验室,南京210098

出　　处：《地下空间与工程学报》2018年第1期273-279,共7页Chinese Journal of Underground Space and Engineering

基　　金：水利部公益性行业科研专项经费项目(201401006);浙江省交通运输厅科技计划项目(2014W07);十二五国家科技支撑计划项目(2015BAB07B06)

摘　　要：随着我国经济社会的发展,道路扩宽工程日益增多,然而针对海域公路这一特殊工况下道路扩宽的报道及研究尚少。本文以海域公路拓宽为背景,结合数值分析,研究了原有路堤和拓宽路堤的沉降变形规律,并在原有地基不同固结度条件下的新路堤拼宽变形及稳定予以分析,结果表明:地基沉降和水平位移主要发生在软土浅层,新路堤下土体侧向位移均向外侧,地基土的侧向挤出是导致原有路堤不均匀沉降的重要原因;在拓宽荷载作用下,在新旧路堤结合面及其附近会产生过大的剪应力,同时地基内超静孔压分布表明路堤结合部的稳定性最差;原有地基的固结情况对拼宽路段的工后沉降及边坡稳定影响较大,但当固结度达到95%后其影响降低,建议原有地基固结度达到95%时进行道路拼宽作业。With the development of economy,there are large number of road widening,but still less reports and studies on the special conditions of the sea highway road widened. In this paper,under the background of the sea road widening,use numerical analysis to research the settlement laws of original and broaden embankment,and analyze the deformation and stability of the new embankment under different consolidation of the original ground,the results show that： ground subsidence and horizontal displacement occurs mainly in shallow soft soil,the horizontal displacement under new embankment are outward,the extrusion soil is an important cause of uneven settlement of the existing embankment; under widen load,the old and new bonding surface will cause excessive shear stress,while the excess pore pressure distribution of inner ground shows junction embankment stability is the worst; The consolidation of the original ground has great impact on settlement and stability of the broaden embankment,but its impact will reduce after consolidation reaches to 95% when construction is suggested to been done.

关 键 词：海域公路 深厚软基 数值分析 道路拓宽 固结度 

分 类 号：TU447[建筑科学—岩土工程]