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一个考虑剪胀性和应变软化的土体非

陈成, 周正明

陈成, 周正明. 一个考虑剪胀性和应变软化的土体非[J]. 岩土工程学报, 2013, 35(zk1): 39-43.
引用本文: 陈成, 周正明. 一个考虑剪胀性和应变软化的土体非[J]. 岩土工程学报, 2013, 35(zk1): 39-43.
shu
CHEN Cheng, ZHOU Zheng-ming. Nonlinear elastic model for soils incorporating both dilatancy and strain softening[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(zk1): 39-43.
Citation: CHEN Cheng, ZHOU Zheng-ming. Nonlinear elastic model for soils incorporating both dilatancy and strain softening[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(zk1): 39-43.
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一个考虑剪胀性和应变软化的土体非  English Version

  • 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，湖北 武汉 430071

基金项目: 国家（973）重点基础研究发展计划（2010CB732101）
详细信息
    作者简介:

    陈 成(1986- )，男，江苏宿迁人，博士研究生，主要从事土体本构研究。E-mail: chenchengyzdx@163.com。

  • 中图分类号: TU443

Nonlinear elastic model for soils incorporating both dilatancy and strain softening

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

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    摘要
  • 摘要: 区别于金属等材料，土体具有压硬性和剪胀性两个基本性质，为非胡克材料，其应力应变关系也区分为应变硬化型和软化型两种。针对三轴排水剪切试验情况，提出了一种新的剪切曲线描述模式和一种新的体变曲线描述模式，两种描述模式均包含4个参数，各参数的物理意义明确且容易确定。结合沈珠江提出的三参数非线性弹性模型，初步提出了一种修正模型。利用一组三轴排水剪切试验数据对提出的修正模型进行了验证，结果表明，该修正模型能较准确地反映土体的应变软化特性和剪胀性，同时还可以描述土体小应变条件下表现出的刚度高度非线性和高模量特征。
    Abstract: Different from the metal and other materials, the soils have two basic propertios: pressure-sensitivity and dilatancy, and they do not obey the Hook’s law. Their stress-strain relationship is also divided into two types: the strain hardening and strain softening. For drained triaxial shear tests, a new shear curve describing mode and a new volume deformation curve describing mode are proposed respectively. Each mode contains four parameters, and the physical meaning of each parameter is clear and easy to identify. Combined with the three-parameter nonlinear elastic model by Sheng Zhu-jiang, a modified model is proposed initially. The modified model is verified by the data of a set of drained triaxial shear tests. The results show that the modified model can reflect both strain softening and dilatancy of soils reasonably. In addition, it can also describe the features of soils at small strain state, high nonlinearity of stiffness and high modulus accurately.
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    • 参考文献(1)
  • 沈珠江. 理论土力学[M].北京:中国水利水电出版社, 2000.(SHENG Zhu-jiang. Theoretical soil mechanics[M].Beijing:China Water Power Press, 2000. (in Chinese))
    沈珠江. 土的弹塑性应力应变关系的合理形式[J]. (岩土工程学报), 1980, 2(2): 11-19.(SHENG Zhu-jiang. An reasonable constitutive model of soil[J]. Chinese Journal of Geotechnical Engineering, 1980, 2(2): 11-19. (in Chinese))
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    BOLTON M D. The strength and dilatancy of sands[J]. Géotechnique, 1986, 36(1): 65-78.
    岑威钧. 堆石料亚塑性本构模型及面板堆石坝数值分析[D]. 南京: 河海大学, 2005.(CEN Weijun. Hypoplastic modeling for rockfill and numerical analysis of CFRD[D]. Nanjing: Hohai University, 2005. (in Chinese))
    KATRINA R. The stress-dilatancy behaviour of sands: pressure and density dependencies in both monotonic and cyclic loading regimes[D]. Ottawa: University of Calgary, 1997.
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出版历程
  • 收稿日期:  2013-03-01
  • 发布日期:  2013-07-18

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