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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

42卷

期数:

2025年03期

页码:

196-208

栏目:

岩土工程

出版日期:

2025-05-30

文章信息/Info

Title:

Study on settlement and deformation characteristics and stability of subgrade on loose deposit caused by earthquake collapse

文章编号:

1673-2049(2025)03-0196-13

作者:

刘 静¹,李 林²

(1. 中国公路工程咨询集团有限公司,北京 100195; 2. 长安大学 公路学院,陕西 西安 710064)

Author(s):

LIU Jing¹, LI Lin²

(1. China Highway Engineering Consulting Corporation, Beijing 100195, China; 2. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China)

关键词:

路基稳定性;  离心模型试验;  堆积体;  数值分析

Keywords:

subgrade stability;  centrifuge model test;  deposit;  numerical analysis

分类号:

U416.1

DOI:

10.19815/j.jace.2025.03054

文献标志码:

A

摘要:

为深入评估地震堆积体在灾后重建中的应用潜力,以汶川地震灾后南华隧道和盘龙山隧道处的典型堆积体为依托,通过室内试验获取其黏聚力、内摩擦角、最优含水率及最大干密度等关键物理力学参数。在此基础上,设计并开展了5组不同工况下的土工离心模型试验,重点探讨含水率变化和颗粒级配特征对堆积体路基稳定性与变形行为的影响机制,同时结合数值模拟方法开展路基沉降与稳定性分析。结果表明:两处堆积体呈粗粒含量高、孔隙大但级配良好的特征,CBR试验结果显示其承载性能良好,压实后具备较高的路用能力; 填筑过程中中下部坡面出现水平位移,沉降量随压实度提升而显著减小; 地震荷载作用下,中下部边坡易出现滑塌破坏,安全系数偏低,亟需采取有效支挡与防护措施; 研究成果可为灾后堆积体区域公路重建工程提供理论依据与实践指导。

Abstract:

In order to further evaluate the potential application of seismic deposits in post disaster reconstruction, typical deposits at Nanhua tunnel and Panlongshan tunnel after the Wenchuan earthquake were used as a basis to obtain key physical and mechanical parameters such as cohesion, internal friction angle, optimal moisture content, and maximum dry density through indoor experiments. On the basis, five sets of geotechnical centrifuge model tests were designed and carried out under different working conditions, focusing on exploring the influence mechanism of moisture content changes and particle size distribution characteristics on the stability and deformation behavior of the subgrade. At the same time, numerical simulation methods were used to analyze the settlement and stability of subgrade. The results show that the two deposits have the characteristics of high coarse particle content, large pores but good grading. The CBR test results show that the deposits have good bearing performance and high road capacity after compaction. During the filling process, there is horizontal displacement on the lower slope surface, and the settlement decreases significantly with the increase of compaction degree. Under the action of earthquake loads, the middle and lower slopes are prone to collapse and damage, with a low safety factor, and the effective support and protective measures are urgently needed. The research results can provide theoretical basis and practical guidance for road reconstruction projects in post disaster accumulation areas.

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备注/Memo

备注/Memo:

收稿日期:2025-03-17
基金项目:中国博士后科学基金站中特别资助项目(2023T160560)
作者简介:刘 静(1984-),女,高级工程师,E-mail:357640403@qq.com。
Author resume: LIU Jing(1984-), female, senior engineer, E-mail: 357640403@qq.com.

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更新日期/Last Update: 2025-06-01