基于超固结状态的既有软基段路基轻质换填技术研究
作者:
作者单位:

(1.浙江海洋大学 海洋工程装备学院 ,浙江 舟山 316022 ;2.浙江海洋大学 船舶与海运学院 ,浙江 舟山 316022 ;3.浙江交投交通建设管理有限公司 ,浙江 宁波 310000 ;4.贵州民族大学 建筑工程学院 ,贵州 贵阳 550025 ;5.湖北工程学院 土木工程学院 ,湖北 孝感 432100 )

作者简介:

黄宝涛,男,博士,教授.E-mail:7247480@qq.com

通讯作者:

张牡丹,女,硕士研究生.E-mail:7247480@qq.com

中图分类号:

U416.1

基金项目:

宁波市交通科技项目(编号:201902)


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

(1.School of Marine Engineering Equipment , Zhejiang Ocean University , Zhoushan , Zhejiang 316022 , China ;2.School of Naval Architecture and Maritime , Zhejiang Ocean University , Zhoushan , Zhejiang 316022 , China ;3.Zhejiang Investment Traffic Construction Management Limited Company , Ningbo , Zhejiang 310000 , China ;4.College of Civil Engineering and Architecture , Guizhou Minzu University , Guiyang , Guizhou 550025 , China ;5. School of Civil Engineering , Hubei Engineering University , Xiaogan , Hubei 432100 , China )

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    摘要:

    为解决沿海地区公路软基段路基差异沉降病害,该文基于超固结应力比的弹性变形理论,从减轻车辆荷载和结构自重附加应力的角度,开展人造超固结应力比计算分析及轻质化换填新技术的研究。结果表明:适宜密度轻质材料的换填厚度可使路基底部附加应力小于原状软土的自重应力,且附加应力小于软土初始流变应力值,形成的超固结应力比,可让软土地基处于弹性变形状态。试验路的沉降性能观测数据显示:工后 1年使用情况下,轻质化换填路面结构的沉降稳定保持在 1 mm 左右,常规路面结构的沉降量达到 17 mm,超过行车舒适的上限值 15 mm,且沉降还在持续发展中。该文提出基于人造超固结应力比理论的轻质化换填技术可有效解决软基段路基差异沉降,具有显著的理论价值和工程实践推广前景。

    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.

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黄宝涛,张牡丹,黄湘铄,等.基于超固结状态的既有软基段路基轻质换填技术研究[J].中外公路,2024,44(1):16-22.
HUANG Baotao, ZHANG Mudan, HUANG Xiangshuo, et al. Lightweight Replacement Technology for Existing Soft Subgrade Based on Over‑Consolidated State[J]. Journal of China and Foreign Highway,2024,44(1):16-22.

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  • 收稿日期:2022-09-16
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  • 在线发布日期: 2024-03-18
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