格栅加筋处治沿海高速公路拓宽路堤数值分析  

Numerical analysis of geogrids reinforcement for widening embankment of coastal freeway

作　　者：骆俊晖 祁航翔 王家全[2,3] 畅振超 吴勇 LUO Junhui;QI Hangxiang;WANG Jiaquan;CHANG Zhenchao;WU Yong(Guangxi Beitou Transportation Maintenance Technology Group Co.,Ltd.,Nanning 530029,China;Guangxi University Key Laboratory of Disaster Prevention and Mitigation and Prestress Technology,Guangxi University of Science and Technology,Liuzhou 545006,China;Guangxi Zhuang Autonomous Region Engineering Research Center of Geotechnical Disaster and Ecological Control,Liuzhou 545006,China;Guangxi Communications Design Group Co.,Ltd.,Nanning 530029,China)

机构地区：[1]广西北投交通养护科技集团有限公司,广西南宁530029 [2]广西科技大学广西高校防灾减灾与预应力技术重点实验室,广西柳州545006 [3]广西壮族自治区岩土灾变与生态治理工程研究中心,广西柳州545006 [4]广西交通设计集团有限公司,广西南宁530029

出　　处：《广西大学学报（自然科学版）》2024年第2期249-258,共10页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金项目(41962017);广西自然科学基金重点项目(2022GXNSFDA035081);广西高等学校高水平创新团队及卓越学者计划项目(桂教人才〔2020〕6号);广西科技大学研究生教育创新计划项目(GKYC202328)。

摘　　要：为了研究沿海高速公路路堤拓宽差异沉降关键影响因素,采用有限差分软件FLAC^(3D)建模分析,探讨土工格栅加筋参数(格栅层数与格栅弹性模量)、新路堤填土参数(土体重度与土体弹性模量)对拓宽路堤差异沉降的影响,并提出了路堤拓宽最优设计方案。结果表明:土工格栅加筋参数对路堤差异沉降改善作用较小,而新旧路堤差异沉降随着路堤填土重度的增大而增大,且随着路堤填土弹性模量的增大而减小;最后,通过对影响拓宽路堤差异沉降的关键影响因素和拓宽路堤最大剪应变增量进行分析,建议在实际改扩建路堤加宽过程中选择轻质高强的路堤填料,以此来改善路堤拓宽差异沉降的影响。In order to study the key influencing factors of differential settlement of embankment widening of coastal expressway,the finite difference software FLAC^(3D) was used to model and analyze the influence of geogrid reinforcement parameters(geogrid layer number and geogrid elastic modulus)and new embankment filling parameters(soil weight and soil elastic modulus)on differential settlement of widening embankment,and the optimal design scheme of embankment widening was proposed.The results show that the geogrid reinforcement parameters have little effect on the improvement of differential settlement of embankment,and the differential settlement of new and old embankments increases with the increase of embankment filling weight,and decreases with the increase of embankment filling elastic modulus.Finally,through the analysis of the key influencing factors affecting the differential settlement of the widened embankment,combined with the analysis of the maximum shear strain increment of the widened embankment,it is suggested that the lightweight and high-strength embankment filler should be selected in the actual widening process of the widening embankment to improve the influence of the differential settlement of the widening embankment.

关 键 词：路堤拓宽 差异沉降 FLAC^(3D) 土工格栅 

分 类 号：U416.1[交通运输工程—道路与铁道工程]