土的应力-应变关系的一种描述模式

何利军; 孔令伟

土的应力-应变关系的一种描述模式

中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室武汉 430071

详细信息

作者简介:
何利军,主要从事土力学本构模型及基本理论研究.Email:hlj81818@yahoo.com.cn

中图分类号: TU433
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出版历程
- 收稿日期: 2010-01-07
- 修回日期: 2010-03-10
- 刊出日期: 2010-12-25

UNIFORM EXPRESSION OF STRESSSTRAIN RELATIONSHIP OF SOILS

State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071

摘要

摘要: 通常将由土的剪切试验测得的应力-应变关系曲线(q～1曲线)分为应变硬化型和应变软化型,文中提出了一种能同时描述应变硬化型q～1曲线和应变软化型q～1曲线的新模式,并导出了统一的切线模量表达式,进一步探讨了该应力-应变关系曲线描述模式在拟合应变硬化型曲线时的简化形式,及简化形式中参数取值方法和参数与围压的关系等方面的问题。通过与邓肯-张模型和应变软化模型的对比,结果表明该应力-应变关系曲线描述模式能更好地与试验数据吻合,且用其简化形式拟合应变硬化型曲线时,可以通过调整其中一个参数值来表达出不同的曲线形式,从而体现出土体应力-应变关系的多样性。该应力-应变关系描述模式为发展更一般的非线性弹性模型提供了一定的理论基础。
- 非线性弹性模型 /
- 邓肯-张模型 /
- 应变软化模型。
Abstract: In this paper,the stress-strain relationship of soil established from shear tests is distinguished into two kinds-strain hardening type and strain softening type. A new stress-strain model which can not only describes strain hardening stress-strain curve but also strain softening stress-strain curve is presented. The equation of tangent modulus is deduced. The paper presents the simplified form of the expression when it was employed to describe strain hardening stress-strain curve. The method of fixing the parameter and the relationship between the parameters and the confining pressure was studied. Comparing this new model with Duncan-Chang model and the strain softening model, it is found that this new model can better meet test results. The simplified form of new model is more accurately to describe strain hardening stress-strain curve and can describe more kinds of curve comparison with Duncan-Chang mode1. It is able to display variety of the stress-strain curve of soils using a changeable parameter. The unified expression provides a base to develop a general nonlinear mechanics model of soils.
- Nonlinear elastic model /
- Duncan-Chang model /
- Strain softening model

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参考文献(1)

[1] 刘祖德, 陆士强,杨天林,等.应力路径对填土应力-应变关系的影响及其应用
[J].岩土工程学报, 1982, (4):45～55.
Liu Zude,Lu Shiqiang,Yang Tianlin,et al.The influence of stress path on the stress-strain behavior of earthfills and its application.Chinese Jounal of Geotechnical Engineering, 1982, (4):45～55.

[2] 曾国熙. 正常固结黏土不排水剪的归一化性状 .见: 软土地基学术讨论会论文选集 .北京: 水利出版社, 1980.
Zeng Guoxi.Normalized stress-strain behavior of CU-Tests for normal consolidated clay.Selections from Symposium of Soft Soil Base.Beijing:Water Resources Press, 1980.

[3] 王年香, 魏汝龙.软黏土的归一化应力应变模式
[J].水利水运科学研究, 1989,(3):45～55.
Wang Nianxiang,Wei Rulong.A normalized stress-strain model for soft clays.Hydro-Science and Engineering, 1989,(3):45～55.

[4] Desai,C.S. Nonlinear Analysis Using Spline Functions.J.S.M.F.D. ,ASCE, 1971, 97(SM10).

[5] 殷德顺,等. 基于分数阶微积分理论的软土应力-应变关系
[J].岩石力学与工程学报, 2009,(28)增1, 2973～2979.
Yin Deshun,et al. Stress-strain relation of soft soil based on fractional calculus operators theory.Chinese Journal of Rock Mechanics and Engineering, 2009,(28)1, 2973～2979.

[6] 殷德顺,等. 负乘幂本构模型的切线模量
[J].岩土力学, 2009, 30 (7): 2168～2172.
Yin Deshun, et al.Tangent modulus of negative-power constitutive model.Rock and Soil Mechanics, 2009, 30 (7): 2168～2172.

[7] 蒋彭年. 土的本构关系
[M].北京: 科学出版社, 1980.
Jiang Pengnian.The Constitutive Relations of Soil. Beijing:Science Press, 1980.

[8] 沈珠江. 考虑剪胀性土和石料的非线性应力应变模式
[J].水利水运科学研究, 1986,(4):1～14.
Shen Zujiang.A nonlinear dilatant stress-strain model for soils and rock materials.Hydro-Science and Engineering,1986,(4):1～14.

[9] 王立忠, 赵志远,李玲玲.考虑土体结构性的修正邓肯-张模型
[J],水利学报, 2004,(1): 83～89.
Wang Lizhong,Zhao Zhiyuan,Li Lingling.Nonlinear elastic model considering soil structural damage.Journal of Hydraulic Engineering, 2004,(1): 83～89.

[10] 冯世进, 周子范,陈云敏,等.城市固体废弃物剪切强度参数的研究
[J].浙江大学学报((工学版), 2005, 39 (7): 987～991.
Feng Shijin,Zhou Zifan,Chen Yunmin,et al. Study on shear strength parameters of municipal solid waste.Journal of Zhejiang University(Engineering Science), 2005, 39 (7): 987～991.

[11] 周葆春, 冯波,汪墨,等.武汉黏土Duncan本构模型参数研究
[J].岩土力学, 2008, 29 (7): 1788～1792.
Zhou Baochun,Feng Bo,Wang Mo,et al. Research on parameters of Duncan models for Wuhan clay.Rock and Soil Mechanics, 2008, 29 (7): 1788～1792.

[12] 董建国, 赵锡宏.高层建筑地基基础-共同作用理论与实践
[M].同济大学出版社, 1997, 41～42.
Dong Jianguo,Zhao Xihong.Foundation of High-Rise Building-Theory and Practice of Interaction.Tongji University Press, 1997, 41～42.

[13] 杨学强, 朱志政,韩高升,等.不同应力路径下土体的变形特征与破坏特性
[J].岩土力学, 2006, 27 (12): 2181～2185.
Yang Xueqiang,Zhu Zhizheng,Han Gaosheng,et al.Deformation and failure characteristics of soil mass under diferent stress paths.Rock and Soil Mechanics, 2006, 27 (12): 2l81～2185.

[14] 李治. 模拟基坑应力路径的真三轴平面应变试验研究 .南京: 河海大学, 2007.
Li Zhi.Plane strain expedment research of simulating stress path of excavation pit by the true triaxial cell .Nanjing:Hehai University, 2007.

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