黄土沟谷区高填方路基沉降特性及影响因素研究  

Study on Settlement Characteristics and Influencing Factors of High Fill Subgrade in Loess Gully Area

作　　者：徐益山 庄前兵 徐鹏飞 冯浩 杜耀辉 张舒涛 蒋再敏 XU Yishan;ZHUANG Qianbing;XU Pengfei;FENG Hao;DU Yaohui;ZHANG Shutao;JIANG Zaimin(CCCC First Highway Engineering Group Co.,Ltd.,Beijing 100024;Lanzhou Jiaotong University,Lanzhou 730070)

机构地区：[1]中交一公局集团有限公司,北京100024 [2]兰州交通大学,兰州730070

出　　处：《公路交通技术》2023年第5期1-9,共9页Technology of Highway and Transport

基　　金：甘肃省科学技术厅重点研发计划项目-工业类(21YF5GJ189)。

摘　　要：针对黄土沟谷地带高填方路基引起的沉降变形等病害问题,结合室内土工试验数据,采用有限元分析方法,对高填方路基在填筑过程中的沉降特性以及填土含水率、不同地形、路基边坡坡度、边坡处理方式等不同影响因素下的路堤沉降规律进行了研究。结果表明:1)挡土墙能有效降低路堤的水平位移;2)路堤沉降量随着路基填筑高度的增加而增加,最大沉降量发生在填土较厚处,并逐渐向路堤中心移动;3)当填土含水率为16%、填方边坡坡度为40°、原边坡开挖4 m宽台阶时,对高填方路基的沉降控制效果最佳。该结论是高填方路基的沉降主要发生在填筑过程中,实际工程中还应加强填方阶段的沉降变形监测。In view of the problems of settlement and deformation caused by high fill roadbed in loess gully area,the settlement characteristics of high fill roadbed in the process of filling and the settlement law of embankment under different influencing factors such as fill water content,different terrain,slope slope of roadbed and slope treatment are studied by the finite element analysis method and the soil test data.The results show that:1)The retaining wall can effectively reduce the horizontal displacement of embankment.The settlement of embankment increases with the increase of embankment filling height,and the maximum settlement occurs at the place where the filling is thicker,and gradually moves to the center of embankment;2)When the moisture content of the fill is 16%,the slope of the fill is 40°,and the original slope is excavated with 4 m wide steps,the settlement control effect of the high-fill roadbed is the best.It is concluded that the settlement of high fill subgrade mainly occurs in the process of filling,and the monitoring of settlement deformation should be strengthened in the actual project.

关 键 词：高填方路基 沉降 含水率 地形 边坡坡度 

分 类 号：U416.1[交通运输工程—道路与铁道工程]