公路路基拓宽对路基沉降的影响分析  

Analysis on Influence of Highway Subgrade Widening on Subgrade Settlement

作　　者：张志远 ZHANG Zhi-yuan(China Railway 18th Bureau Group Co.,Ltd.Tianjin International Engineering Company.Tianjin 300350,China)

机构地区：[1]中铁十八局集团有限公司天津国际工程公司,天津300350

出　　处：《辽宁科技学院学报》2022年第1期13-16,共4页Journal of Liaoning Institute of Science and Technology

摘　　要：文章基于某市的实际路基拓宽工程,建立了路基结构的三维有限元模型。研究了不同拓宽方法对路基最大沉降值与旧路中心线处沉降值的影响与路基不均匀沉降的控制标准方程式。研究表明,对于单侧拓宽工程,随着拓宽宽度的增加,路基竖向沉降也随之增大,且由于路基的不均匀沉降导致了反坡现象,应谨慎考虑其防水措施,防治水毁沉陷现象;对于双侧均匀拓宽工程,其基本规律与单侧拓宽无异,但较单侧而言改善了道路的结构受力特征,有效地减少了路基竖向沉降值,并且不会出现由边坡效应导致的反坡现象;阐明了路基不均匀沉降与拓宽比和坡度限值之间的关系,提出了三者之间的拟合方程式,可以有效、真实地统纳路基沉降数据的离散特征。Based on the actual subgrade widening project in a city,a three-dimensional finite element model of subgrade structure was established in this paper.The influence of different widening methods on the maximum settlement of subgrade and the settlement at the center line of old road and the control standard equation of uneven settlement of subgrade were studied.The results showed that for the unilateral widening project,with the increase of widening width,the vertical settlement of subgrade also increases,and the uneven settlement of subgrade leads to the phenomenon of reverse slope.Therefore,the waterproof measures should be carefully considered to prevent water damage and settlement.For the bilateral uniform widening project,its basic law is the same as that of unilateral widening,but compared with unilateral widening,it improves the structural stress characteristics of the road,thus effectively reducing the vertical settlement of the subgrade and leading to no reverse slope phenomenon.This paper expounds the relationship between subgrade differential settlement and widening ratio and slope limit,and puts forward the fitting equation between them,which can effectively and truly integrate the discrete characteristics of subgrade settlement data.

关 键 词：路基 拓宽工程 拟合回归 有限元 

分 类 号：U416.1[交通运输工程—道路与铁道工程]