基于拓宽路面附加变形的地基差异沉降控制标准  

Control criterion for foundation differential settlement based on additional deformation in widening pavement

作　　者：翁效林[1] 高建华[2] 宋文佳[1] 马豪豪[1] 

机构地区：[1]长安大学特殊地区公路工程教育部重点实验室,陕西西安710064 [2]河南交通职业技术学院公路系,河南郑州450000

出　　处：《长安大学学报（自然科学版）》2013年第5期26-31,共6页Journal of Chang’an University(Natural Science Edition)

基　　金：国家自然科学基金项目(51008032;51378004)

摘　　要：为建立拓宽路基荷载下地基差异沉降控制标准,以拓宽路面结构附加变形临界值为控制目标,依托有限元分析软件,建立拓宽路基荷载下地基沉降的计算模型,通过拟合地基沉降曲线,并将其作为位移约束条件施加到路堤底面,分析路堤顶面的沉降特性,反算出拓宽荷载下地基差异沉降控制限值,并以此作为拓宽荷载下地基差异沉降控制标准。研究结果表明:随着填方高度的增加,地基差异沉降限值呈增大趋势;随着拓宽比的增加,地基差异沉降限值呈减小趋势;随着路堤填料弹性模量的增加,地基差异沉降限值呈增大趋势,然而随着地基填料弹性模量的增大,地基差异沉降的限值呈减小趋势;4个影响因素的影响程度大小依次为新老路堤拓宽比、路堤填料模量、地基填料模量、路堤填方高度;得出了地基差异沉降控制值与新老路堤拓宽比和路面结构反坡率之间的关系表达式。In order to establish the control criterion for differential settlement of the foundation in widening roadbed under load, using the critical value of the additional deformation in widening pavement structure as control objective, and relying on the finite element analysis software, foun- dation settlement calculation model was established. Through fitting the foundation settlement curve, and exerting it to the embankment bottom as a constraint condition, the settlement prop- erties of the embankment surface were analyzed, anti-calculating the limit value of differential set- tlement of the foundation was conducted, and the control criterion for differential settlement of the foundation was obtained. The results show that the limit value of differential settlement in- creases as the embankment fill height or the elastic modulus of embankment fill increases, howev-er, it decreases as the widening ratio or the elastic modulus of foundation fill increases. The de- grees of these four factors＇ influence from the largest to the smallest are. old and new embankment＇s widening ratio, elastic modulus of foundation fill, elastic modulus of foundation fill and embankment fill height. The study has also obtained a relational expression between the limit value of differential settlement of the foundation and the widening ratio of the old and new embankment, the anti-slope change ratio of pavement. 5 tabs, 6 figs, 13 refs.

关 键 词：道路工程 拓宽路面 附加变形 差异沉降 控制标准 

分 类 号：U416.1[交通运输工程—道路与铁道工程]