含有机质地基在路堤荷载作用下的固结沉降

IF 2.5 3区 工程技术 Q2 ENGINEERING, CIVIL
Ruiling Feng, Liyang Wang, K. Wei, Jiachen Zhao
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引用次数: 2

摘要

泥炭地在中国分布广泛,土壤有机质因其渗透性和压缩性高,经常给公路工程的建设和养护带来问题。本文以大理至丽江高速公路为研究对象,在全国范围内选定了一个选址。采用PLAXIS 8.2中的软土蠕变(SSC)模型,建立了对所选断面基础沉降的数值预测模型。后来实地观察的结果证实了该模型。为此,将中国不同地区有机含量在1.1 ~ 74.9%范围内的17种土壤的参数赋值到数值模型中,研究了沉降特征。计算结果表明,随着有机质含量的增加,初次固结持续时间和初次沉降占总沉降的比例减小。在数值模型计算结果的基础上,采用多元线性回归方法,提出了总固结沉降和二次沉降的经验方程。部分土体参数的重要性分析结果表明,自然压缩指数、二次压缩指数、黏聚力和摩擦角对总沉降和二次沉降均有显著的线性相关性,而初始渗透系数仅对二次沉降有显著影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Consolidation settlement of soil foundations containing organic matters subjected to embankment load
Peatland is distributed in China widely, and organic matters in soil frequently induce problems in the construction and maintenance of highway engineering due to the high permeability and compressibility. In this paper, a selected site of Dali-Lijiang expressway was surveyed in China. A numerical model was built to predict the settlement of the foundation of the selected section employing the soft soil creep (SSC) model in PLAXIS 8.2. The model was subsequently verified by the result of field observance. Consequently, the parameters of 17 types of soils from different regions in China with organic contents varying from 1.1–74.9% were assigned to the numerical model to study the settlement characteristics. The calculated results showed that the duration of primary consolidation and proportion of primary settlement in the total settlement decreased with increasing organic content. Two empirical equations, for total consolidation settlement and secondary settlement, were proposed using multiple linear regression based on the calculated results from the numerical models. The analysis results of the significances of certain soil parameters demonstrated that the natural compression index, secondary compression index, cohesion and friction angle have significant linear relevance with both the total settlement and secondary settlement, while the initial coefficient of permeability exerts significant influence on the secondary settlement only.
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来源期刊
Geomechanics and Engineering
Geomechanics and Engineering ENGINEERING, CIVIL-ENGINEERING, GEOLOGICAL
CiteScore
5.20
自引率
25.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: The Geomechanics and Engineering aims at opening an easy access to the valuable source of information and providing an excellent publication channel for the global community of researchers in the geomechanics and its applications. Typical subjects covered by the journal include: - Analytical, computational, and experimental multiscale and interaction mechanics- Computational and Theoretical Geomechnics- Foundations- Tunneling- Earth Structures- Site Characterization- Soil-Structure Interactions
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