基于<em>e</em>-<em>p</em>曲线的软土地基非线性沉降的实用计算方法

杨光华; 姚丽娜; 姜燕; 黄忠铭

doi:10.11779/CJGE201502005

基于e-p曲线的软土地基非线性沉降的实用计算方法 English Version

杨光华^{1, 2, 3},
姚丽娜²,
姜燕^{1, 3},
黄忠铭²

1. 广东省水利水电科学研究院,广东广州 510610; 2. 华南理工大学土木与交通学院,广东广州 510641; 3. 广东省岩土工程技术研究中心,广东广州 510640

基金项目: 国家自然科学基金项目（51378131）; 广东省水利科技创新项目（2009-25）

详细信息

作者简介:
杨光华(1962- ),男,广东罗定人,博士,教授级高级工程师,博士生导师,主要从事本构理论、基础工程、软土工程及基坑工程等方面的研究、设计及咨询工作。E-mail: ygh@gdsky.com.cn。

中图分类号: TU47
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出版历程
- 收稿日期: 2014-03-30
- 发布日期: 2015-03-01

Practical method for calculating nonlinear settlement of soft ground based on e-p curve

1. Guangdong Research Institute of Water Resources and Hydropower, Guangzhou 510610, China; 2. School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510641, China; 3. Geotechnical Engineering Technology Center of Guangdong Province, Guangzhou 510641, China

摘要

摘要: 软土地基侧向变形引起的沉降不可忽略。目前中国地基规范对软土地基的沉降主要是采用侧限压缩试验曲线进行一维压缩沉降计算,然后对该计算结果乘以一个经验修正系数来反映软土侧向变形等所产生的沉降,经验系数为1.1~1.7,变化大,缺乏量化取用方法。因此,侧向变形引起的沉降尚缺乏有效可靠的实用计算方法。基于e-p曲线和Duncan-Chang 本构模型的概念提出了用e-p曲线求取软土的非线性切线模量E_t的方法,然后把地基的沉降分解为有侧限的压缩沉降和侧向变形产生的沉降两部分。有侧限的压缩沉降采用传统的e-p曲线分层总和法计算,侧向变形的沉降用非线性切线模量E_t进行分层总和法求得。模型简单、参数易获得,由此而建立了一个较简便实用的软土地基非线性沉降计算方法。并通过一个工程案例与实测结果、规范方法计算结果和有限元数值分析结果进行比较,说明方法的可行性。
- 软土沉降 /
- 侧向变形 /
- e-p曲线 /
- 切线模量 /
- 分层总和法
Abstract: It is well recognized that the settlement caused by lateral deformation of soft ground cannot be ignored. In China's technical codes and specifications, the current methods for calculating the settlement of soft ground are the one-dimensional ones with compression curve under zero lateral strain condition. To reflect the settlement of soft soil caused by lateral deformation, the calculated results are multiplied by an empirical correction coefficient (1.1~1.7). However, the coefficient is greatly changeable and cannot be quantified clearly. Therefore, an effective and reliable method is needed for calculating the settlement caused by lateral deformation in engineering practice. In this paper, a simple and practical method for calculating nonlinear settlement of soft ground is established based on the concepts of e-p curve and nonlinear tangent modulus E_t, which divides the foundation settlement into two parts. One is the compression settlement under zero lateral strain condition, which is calculated by the conventional layer-wise summation method with e-p curve; the other is the settlement caused by the lateral deformation, which is calculated by layer-wise summation method with nonlinear tangent modulus E_t. The parameters of this method can all be obtained by using the e-p curve. To describe the feasibility of the proposed method, a comparison with the measured results and those by other methods such as finite element method is made through a project case.
- soft ground settlement /
- lateral deformation /
- e-p curve /
- tangent modulus /
- layer-wise summation method

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参考文献(11)

[1]	.JGJ79—2012建筑地基处理技术规范[S]. 2012. (JGJ79—2012 Technical code for ground treatment of buildings[S]. 2012. (in Chinese))
[2]	JTJ017—96公路软土地基路堤设计与施工技术规范[S]. 1996. (JTJ017—96 Technical specification for design and construction of highway embankment on soft ground[S]. 1996. (in Chinese))
[3]	GB50286—98堤防工程设计规范规范[S]. 1998. (GB50286—98 Code for design of levee project[S]. 1998. (in Chinese))
[4]	王志亮, 李永池, 殷宗泽. 考虑土体侧胀性的路堤沉降计算探讨[J]. 岩石力学与工程学报, 2005, 24(10): 1772-1777. (WANG Zhi-liang, LI Yong-chi, YIN Zong-ze. Discussion on settlement calculation of embankment considering lateral dilation behavior of soils[J]. Chinese Journal of Rock Mechanics and Engineering, 2005, 24(10): 1772-1777. (in Chinese))
[5]	杨武, 曹文昭, 董佳竹. 考虑侧向变形的客运专线路基沉降特性研究[J]. 土木工程与管理学报, 2012, 3(9): 99-103. (YANG Wu, CAO Wen-zhao, DONG Jia-zhu. Study of subgrade settlement behavior of passenger dedicated line considering the lateral deformation effects[J]. Journal of Civil Engineering and Management, 2012, 3(9): 99-103. (in Chinese))
[6]	王志亮, 殷宗泽, 李永池. 邓肯-张模型有限元分析路堤沉降实用方法[J]. 岩土力学, 2005, 26(7): 1085-1089. (WANG Zhi-liang, YIN Zong-ze, LI Yong-chi. Practical method for FEM analysis of embankment settlement with Duncan-Chang model[J]. Rock and Soil Mechanics, 2005, 26(7): 1085-1089. (in Chinese))
[7]	杨光华. 软土地基非线性沉降计算的简化法[J]. 广东水利水电, 2001(1): 3-5. (YANG Guang-hua. A simplified calculation method for soft ground nonlinear settlement[J]. Guangdong Water Resources and Hydropower, 2001(1): 3-5. (in Chinese))
[8]	杨光华, 李德吉, 李思平, 等. 计算软土地基非线性沉降的一个简化方法[C]// 第九届土力学及岩土工程学术会议论文集. 北京, 2003: 506-510. (YANG Guang-hua, LI De-ji, LI Si-ping, et al. A simplified method for calculating nonlinear settlement of soft ground[C]// Ninth Soil Mechanics and Geotechnical Engineering Conference Proceedings. Beijing, 2003: 506-510. (in Chinese))
[9]	刘成宇. 土力学[M]. 北京: 中国铁道出版社, 1990. (LIU Cheng-yu. Soil mechanics[M]. Beijing: China Railway Press, 1990. (in Chinese))
[10]	李广信. 高等土力学[M]. 北京: 清华大学出版社, 2004. (LI Guang-xin. Advanced soil mechanics[M]. Beijing: Tsinghua University Press, 2004. (in Chinese))
[11]	陆培炎, 熊丽珍, 陈韶永, 等. 软土上一个土堤试验分析. [M]// 陆培炎科技著作及论文选集. 北京: 科学出版社, 2006: 121-143. (LU Pei-yan, XIONG Li-zhen, CHEN Shao-yong, et al. A trial embankment analysis on soft soil[M]// Lu Pei Yan Anthology of Scientific Works and Papers. Beijing: Science Press, 2006: 121-143. (in Chinese))