基于陕北地区不同填方路基的沉降特性分析  

Analysis of Settlement Characteristics of Different Patterns of Filled Subgrade in Northern Shaanxi

作　　者：张晓轴 赵金朋 常应红 杨浩 李哲[2] 刘路路[2,3] 张树筱 ZHANG Xiaozhou;ZHAO Jinpeng;CHANG Yinghong;YANG Hao;LI Zhe;LIU Lulu;ZHANG Shuxiao(Yulin Highway Bureau,Yulin 719199,Shaanxi,China;School of Highway,Chang'an University,Xi'an 710064,China;State Key Laboratory for Geomechanics&Deep Underground Engineering,Xuzhou 221116,Jiangsu,China)

机构地区：[1]榆林市公路局,陕西榆林719199 [2]长安大学公路学院,西安710064 [3]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221116

出　　处：《路基工程》2023年第5期56-62,共7页Subgrade Engineering

基　　金：长沙理工大学公路养护技术国家工程研究中心开放基金资助项目(kfj220104)。

摘　　要：依托G307国道在榆林市某道路改扩建项目,通过对不同路基填筑形式进行分层预埋单点沉降计,测试各层土的分层沉降量、累计沉降量及横向沉降量,并绘制其随时间的变化趋势;分析不同路基填筑时的最大沉降量作用位置,研究因路基填筑不当或黄土压实不充分而引起的路基沉降问题。结果表明:沉降在初期阶段变化大,而后逐渐趋于稳定,距离路基顶面越近,沉降量越大;不同填方路基的最大沉降量作用点不同,半填半挖路基最大沉降量作用在路肩处;挡土墙支护路基下部土层受挡土墙的影响,最大沉降量在路基中线处,上部土层最大值点在路肩处;“V”形冲沟填方路基,最大沉降量呈现出“U”型变化规律,在路基中线沉降量最大。Relying on the G307 National Highway Reconstruction and Expansion Project in Yulin,the singlepoint sediment measurement gauge was buried into different layers of different subgrade filling forms,and the trend of layered settlement,cumulative settlement and lateral settlement of each layer of soil over time were tested and plotted.The action position of the maximum settlement during different subgrade fillings was analyzed,and the subgrade settlement caused by improper subgrade filling or insufficient loess compaction was studied.The results showed that the settlement changes greatly in the initial stage and gradually tends to be stable.The closer to the top surface of the subgrade,the greater the sediment.The maximum settlement action points of different types of filled subgrades are different.The action point of the maximum settlement of the half-filled and half-dug subgrade is at the road shoulder.Affected by the retaining wall,the maximum settlement of the lower soil layer of the subgrade supporting the retaining wall is at the centerline of the subgrade,and the maximum settlement of the upper soil layer is at the road shoulder.For the filling subgrade of the V-shaped gully,the maximum settlement exhibits a U-shaped variation pattern.The maximum settlement occurs at the centerline of the subgrade.

关 键 词：路基填筑 沉降监测 半填半挖 路肩 挡土墙 稳定性 

分 类 号：U416.1[交通运输工程—道路与铁道工程]