泡沫轻质土加宽抬高路基方案比选与变形数值分析  

Application and Deformation Numerical Analysis of Soil Widening and Foam Lightweight Soil Elevation Subgrade

作　　者：刘宏山 刘敏 罗枫 姜峰林 LIU Hongshan;LIU Min;LUO Feng;JIANG Fenglin(Guangdong Provincial Expressway Development Co.,Ltd.,Guangzhou Guangdong 510623,China;Guangdong S&C Civil Engineering Co.,Ltd.,Guangzhou Guangdong 514110,China)

机构地区：[1]广东省高速公路有限公司,广东广州510623 [2]广东首诚建设科技有限公司,广东广州514110

出　　处：《广东公路交通》2024年第5期11-16,共6页Guangdong Highway Communications

基　　金：广东省科技厅计划项目“高速公路改扩建工程快速安全建设关键技术研究”(2021B1111610002)。

摘　　要：为探求深汕西高速改扩建加宽抬高路基的合理方案和沉降变形特性,结合工程地质条件、工程造价、减少占地和道路保通的要求,对挡墙+填土路基方案、泡沫轻质土路基方案和填土加宽+泡沫轻质土抬高路基方案进行了定性比较,最终确定两侧填土加宽至原路基土路肩标高,再分幅分块填筑泡沫轻质土抬高路基至设计标高为推荐方案。通过对推荐方案分幅分块施工的数值分析,得到了加宽抬高路基的沉降变形规律。结果表明,抬高路基的整体最大沉降量为42.5mm,分块路基之间最大沉降差异为25mm,沉降量及沉降差异均满足规范要求。推荐方案路基总体沉降小、沉降差异可控、造价合理、工期短,还可以有效保证车辆安全通行,是一种可行的路基加宽抬高方案。In order to explore a reasonable scheme and identify the settlement deformation characteristics for the widening and raising of subgrade in the reconstruction and expansion of Shenzhen-Shantou West Expressway considering the requirements of engineering geological conditions,project cost,land occupation,and road maintenance,a qualitative comparison was made among the retaining wall+filling subgrade scheme,foam lightweight soil subgrade scheme and filling widening+foam lightweight soil raising subgrade scheme.Ultimately,the recommended scheme was determined to be widening the subgrade on both sides to the original subgrade soil shoulder height with filled soil,and followed by raising the subgrade to the design elevation with the filling of foam lightweight soil in separated roadway and block construction.Through the numerical analysis of the separated roadway and block construction process of the recommended scheme,the settlement deformation patterns of the widened and elevated roadbed were obtained.The results showed that the maximum overall settlement of the elevated subgrade was 42.5mm,with a maximum settlement difference between the subgrades of different roadways was 25mm.Both the settlement amount and settlement difference met the requirements of specification.The recommended scheme has the advantages of small overall settlement,controllable settlement difference,reasonable cost and short construction period,which can effectively ensure the safe passage of vehicles,and making it a feasible scheme for widening and raising subgrade.

关 键 词：高速公路 改扩建 泡沫轻质土 路基加宽抬高 

分 类 号：U416.1[交通运输工程—道路与铁道工程]