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超固结非饱和土的本构关系

姚仰平, 牛 雷, 崔文杰, 万 征

姚仰平, 牛 雷, 崔文杰, 万 征. 超固结非饱和土的本构关系[J]. 岩土工程学报, 2011, 33(6): 833.
引用本文: 姚仰平, 牛 雷, 崔文杰, 万 征. 超固结非饱和土的本构关系[J]. 岩土工程学报, 2011, 33(6): 833.
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YAO Yang-ping, NIU Lei, CUI Wen-jie, WAN Zheng. UH model for unsaturated soils[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(6): 833.
Citation: YAO Yang-ping, NIU Lei, CUI Wen-jie, WAN Zheng. UH model for unsaturated soils[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(6): 833.
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超固结非饱和土的本构关系  English Version

  • 北京航空航天大学交通科学与工程学院，北京 100191

基金项目: 国家自然科学基金项目（50879001；11072016；10872016）

UH model for unsaturated soils

  • Department of Civil Engineering, Beihang University, Beijing 100191, China;

摘要

    摘要
  • 摘要: Alonso等提出的巴塞罗那(Barcelona)弹塑性本构模型是非饱和土本构模型中的代表，将巴塞罗那本构模型与姚仰平等所提出的超固结土UH本构模型相结合，使之适用于超固结非饱和土。该模型在吸力等于零的时候就退化成饱和土的UH本构模型；在吸力不为零且无超固结的情况下，就退化成巴塞罗那本构模型；该模型不仅使超固结状态下的湿化模拟更为合理，而且也能够反映超固结非饱和土的硬化、软化、剪缩、剪胀特性和不同应力路径对超固结非饱和土变形特性的影响，同时能够反映湿化使超固结程度降低甚至使超固结消失的特性。与巴塞罗那模型相比，本文所提出的模型没有增加任何新的材料参数，且与已有的试验结果对比分析，表明该模型能够较为合理地描述超固结非饱和土的基本力学特性。
    Abstract: A new elasto-plastic model for overconsolidated unsaturated soils is presented by combining the Barcelona Basic Model (BBM), one of the classic elasto-plastic models for unsaturated soils, and UH model, one of the improved elasto-plastic models for overconsolidated soils, with the same soil parameters as the Cam-clay model. The proposed model is able to be changed into the UH model and BBM while the suction of overconsolidated unsaturated soils is zero and the consolidation behavior of unsaturated soils disappears respectively. Compared with the previous models, the wetting behavior of unsaturated soils in overconsolidated condition can be described more reasonably while many characteristics of overconsolidated soils considering suction effect can be modeled, including strain-hardening, softening, dilatancy and stress path dependence behavior. It is shown in the model that the overconsolidation level declines or even disappears during wetting. The validity of the model is confirmed by data from the previous triaxial tests for overconsolidated unsaturated soils.
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    • 参考文献(15)
  • [1] ALONSO E E, GENS A, JOSA A. A constitutive model for partially saturated soils[J]. Geotechnique, 1990, 40(3): 405–430.
    [2] 沈珠江. 土体变形特征的损伤力学模拟[C]// 第5届全国土力学数值分析与解析方法讨论会议论文集. 重庆, 1994:1–8. (SHEN Zhu-jiang. Modeling of soil deformation by damage mechanics[C]// Pro 5th Chinese National Conference on Numerical and Analytical Methods in Geotechnical Engineering, 1994: 1–8. (in Chinese))
    [3] 陈正汉, 周海清, FREDLUND D G. 非饱和土的非线性模型及其应用[J]. 岩土工程学报, 1999, 21(5): 603–608.(CHEN Zheng-han, ZHOU Hai-qing, FREDLUND D G. Nonlinear model for unsaturated soils and its application[J]. Chinese Journal of Geotechnical Engineering, 1999, 21(5): 603–608. (in Chinese))
    [4] SUN D A, MATSUOKA H, YAO Y P, Ichihara W. An elastoplastic model for unsaturated soil in three-dimensional stresses [J]. Soils and Foundations, 2000, 40(3): 17–28.
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    [13] 姚仰平, 侯  伟, 罗  汀. 土的统一硬化模型[J]. 岩石力学与工程学报, 2009, 28(10): 2135–2151. (YAO Yang-ping, HOU Wei, LUO Ting. Unified hardening model for soils[J]. Chinese Journal of Rock Mechanics and Engineering, 2009, 28(10): 2135–2151. (in Chinese) )
    [14] CELESTINO RAMPINO, CLAUDIO MANCUSO, FILIPPO VINALE. Experimental behaviour and modelling of an unsaturated compacted soil[J]. Géotechnique, 2000, 50: 748–763.
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  • 发布日期:  2011-06-14

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