Lightweight Replacement Technology for Existing Soft Subgrade Based on Over‑Consolidated State

Authors

HUANG Baotao, School of Marine Engineering Equipment ， Zhejiang Ocean University ， Zhoushan ， Zhejiang 316022 ， China ;School of Naval Architecture and Maritime ， Zhejiang Ocean University ， Zhoushan ， Zhejiang 316022 ， ChinaFollow
ZHANG Mudan, School of Marine Engineering Equipment ， Zhejiang Ocean University ， Zhoushan ， Zhejiang 316022 ， China ;School of Naval Architecture and Maritime ， Zhejiang Ocean University ， Zhoushan ， Zhejiang 316022 ， ChinaFollow
HUANG Xiangshuo, School of Marine Engineering Equipment ， Zhejiang Ocean University ， Zhoushan ， Zhejiang 316022 ， China ;School of Naval Architecture and Maritime ， Zhejiang Ocean University ， Zhoushan ， Zhejiang 316022 ， China
FANG Mingshan, School of Naval Architecture and Maritime ， Zhejiang Ocean University ， Zhoushan ， Zhejiang 316022 ， China ;Zhejiang Investment Traffic Construction Management Limited Company ， Ningbo ， Zhejiang 310000 ， China
FENG Jianxue, College of Civil Engineering and Architecture ， Guizhou Minzu University ， Guiyang ， Guizhou 550025 ， China
HUANG Lizhen, School of Civil Engineering ， Hubei Engineering University ， Xiaogan ， Hubei 432100 ， China

Corresponding Author

张牡丹，女，硕士研究生.E-mail：7247480@qq.com

Abstract

In order to solve the differential settlement of soft subgrade in coastal areas，based on the elastic deformation theory of overconsolidation stress ratio，the calculation and analysis of artificial overconsolidation stress ratio and the new technology of lightweight replacement were carried out to reduce the additional stress of vehicle load and structure weigh.The results show that the replacement thickness of the lightweight material with suitable density can make the additional stress at the bottom of the subgrade less than the deadweight stress of the original soft soil，and the additional stress is less than the initial flow stress of the soft soil.The resulting overconsolidation stress ratio can put the soft soil in a state of elastic deformation.The observed data of settlement performance of the test road show that the settlement of the pavement structure remains with lightweight replacement is stable at about 1 mm one year after construction；the settlement of conventional pavement structure reaches 17 mm，which exceeds the upper limit of driving comfort of 15 mm，and the settlement is still intensifying.The proposed lightweight replacement technology based on the artificial overconsolidation stress ratio theory can effectively solve the differential settlement of soft subgrade，which has significant theoretical value and practical application prospects.

Publication Date

3-18-2024

DOI

10.14048/j.issn.1671-2579.2024.01.003

First Page

16

Last Page

22

Submission Date

February 2025

Recommended Citation

Baotao, HUANG; Mudan, ZHANG; Xiangshuo, HUANG; Mingshan, FANG; Jianxue, FENG; and Lizhen, HUANG (2024) "Lightweight Replacement Technology for Existing Soft Subgrade Based on Over‑Consolidated State," Journal of China & Foreign Highway: Vol. 44: Iss. 1, Article 3.
DOI: 10.14048/j.issn.1671-2579.2024.01.003
Available at: https://zwgl1980.csust.edu.cn/journal/vol44/iss1/3

Reference

[1]吴海刚 ,王宝军 ,郑永红 ,等.大规模采用泡沫轻质土处理软基设计方法探讨 [J].铁道工程学报 ,2016 ,33(2):28-33.WU Haigang ,WANG Baojun ,ZHENG Yonghong ,et al .Research on the design method of the large-scale foam light soil for soft ground treatments [J].Journal of Railway Engineering Society ,2016 ,33(2):28-33.
[2]王欢 ,王选仓 ,高志伟 .高速公路软基过渡段均衡沉降处治[J].武汉理工大学学报 ,2014 ,36(7):50-54.WANG Huan ,WANG Xuancang ,GAO Zhiwei .Treatment of highway soft foundation transition section isostatic settlement [J].Journal of Wuhan University of Technology ,2014 ,36(7):50-54.
[3]章海明 .高速公路软土路基沉降及处治数值分析 [J].水利与建筑工程学报 ,2017 ,15(6):211-215.ZHANG Haiming .Numerical analysis of settlement and treatment of soft soil subgrade under highway [J].Journal of Water Resources and Architectural Engineering ,2017 ,15(6):211-215.
[4]NAKANISHI K ,TAKEWAKI I .Optimum pile arrangement in piled raft foundation by using simplified settlement analysis and adaptive step-length algorithm [J].Geomechanics and Engineering ,2013 ,5(6):519-540.
[5]王祥 .高速铁路软土地基的差异沉降试验研究 [J].铁道工程学报 ,2015 ,32(3):11-15,45.WANG Xiang .Experimental research on the differential settlement of soft soil ground in high-speed railway [J].Journal of Railway Engineering Society ,2015 ,32(3):11-15,45.
[6]刘彬 .立体改扩建道路桥墩与高填方拓宽路基交叉影响研究 [J].公路 ,2022 ,67(5):112-118.LIU Bin .Study on the influence of intersection between three-dimensional reconstruction and expansion of road pier and high fill widening subgrade [J].Highway ,2022 ,67(5):112-118.
[7]祝建华 ,吕茂丰 ,查旭东 ,等.钢丝网加筋新老路面结合部抗拓宽路基差异沉降的数值模拟 [J].长沙理工大学学报(自然科学版 ),2021 ,18(4):1-8.ZHU Jianhua ,LYU Maofe ng,ZHA Xudong ,et al .Numerical simulation on resisting widening subgrade differential settlement for joint between new and old pavement reinforced by steel wire mesh [J].Journal of Changsha U niversity of Science & Technology (Natural Science ),2021 ,18(4):1-8.
[8]卢谅 ,马书文 ,李蓝星 ,等.预应力加筋垫层差异沉降控制性能试验研究 [J].工程地质学报 ,2021 ,29(5):1577 -1586 .LU Liang ,MA Shuwen ,LI Lanxing ,et al .Experimental study on differential settlement control performance of prestressed reinforced cushion [J].Journal of Engineering Geology ,2021 ,29(5):1577 -1586 .
[9]陈 宗 燕 .滨 海 软 基 段 公 路 管 廊 路 基 工 后 沉 降 特 性 研 究[J].水利与建筑工程学报 ,2021 ,19(4):131-137.CHEN Zongyan . Post-construction settlement characteristics of highway pipe gallery roadbed in coastal soft foundation section [J].Journal of Water Resources and Architectural Engineering ,2021 ,19(4):131-137.
[10]徐林荣 ,陈昀灏 ,曹德洪 ,等.变长桩 -板结构应用在软土地区 路 ‒涵 过 渡 段 试 验 [J].长 安 大 学 学 报 (自 然 科 学 版 ),2021 ,41(3):1-11.XU Linrong ,CHEN Yunhao ,CAO Dehong ,et al .Experimental on application of variable length pile-plate structure in road-culvert transition section in soft soil area[J].Journal of Chang'an University (Natural Science Edition ),2021 ,41(3):1-11.
[11]李海滨 ,唐国茜 ,赵桂娟 ,等.三维激光扫描技术在路堤沉降 观 测 中 的 应 用 [J].西 安 科 技 大 学 学 报 ,2021 ,41(1):87-93.LI Haibin ,TANG Guoxi ,ZHAO Guijuan ,et al .Application of 3D laser scanning technology in the observation of embankment settlements [J].Journal of Xi'an University of Science and Technology ,2021 ,41(1):87-93.
[12]王灏 ,刘珍 ,杨果林 ,等.高液限土半填半挖高边坡路基变形 影 响 因 素 分 析 [J].水 利 与 建 筑 工 程 学 报 ,2020 ,18(6):190-195.WANG Hao ,LIU Zhen ,YANG Guolin ,et al .Influencing factors analysis of subgrade deformation of high liquid limit soil in semi-filled and semi-cut high slope [J].Journal of Water Resources and Architectural Engineering ,2020 ,18(6):190-195.