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考虑微观孔隙结构的非饱和土水-力耦合本构模型

蔡国庆, 王亚南, 周安楠, 赵成刚

蔡国庆, 王亚南, 周安楠, 赵成刚. 考虑微观孔隙结构的非饱和土水-力耦合本构模型[J]. 岩土工程学报, 2018, 40(4): 618-624. DOI: 10.11779/CJGE201804005
引用本文: 蔡国庆, 王亚南, 周安楠, 赵成刚. 考虑微观孔隙结构的非饱和土水-力耦合本构模型[J]. 岩土工程学报, 2018, 40(4): 618-624. DOI: 10.11779/CJGE201804005
shu
CAI Guo-qing, WANG Ya-nan, ZHOU An-nan, ZHAO Cheng-gang. A microstructure-dependent hydro-mechanical coupled constitutive model for unsaturated soils[J]. Chinese Journal of Geotechnical Engineering, 2018, 40(4): 618-624. DOI: 10.11779/CJGE201804005
Citation: CAI Guo-qing, WANG Ya-nan, ZHOU An-nan, ZHAO Cheng-gang. A microstructure-dependent hydro-mechanical coupled constitutive model for unsaturated soils[J]. Chinese Journal of Geotechnical Engineering, 2018, 40(4): 618-624. DOI: 10.11779/CJGE201804005
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考虑微观孔隙结构的非饱和土水-力耦合本构模型  English Version

  • 1. 北京交通大学城市地下工程教育部重点实验室,北京100044;
    2. 北京交通大学土木建筑工程学院,北京 100044;
    3. 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（51722802, 51678041）; 河南省交通运输科技计划项目（2017B4）; 北京市自然科学基金面上项目（8162032）; 中央高校基本科研业务费项目（2017JBM091）
详细信息
    作者简介:

    蔡国庆(1983- ),男,江苏镇江人,副教授,主要从事非饱和土本构关系及多场耦合等方面的研究工作。E-mail: guoqing.cai@.bjtu.edu.cn。

  • 中图分类号: TU441.2

A microstructure-dependent hydro-mechanical coupled constitutive model for unsaturated soils

  • 1. Key Laboratory of Urban Underground Engineering of Ministry of Education, Beijing Jiaotong University, Beijing 100044, China;
    2. School of Civil Engineering and Architecture, Beijing Jiaotong University, Beijing 100044, China;
    3. School of Transportation Science and Engineering, Beihang University, Beijing 100191, China;

摘要

    摘要
  • 摘要: 非饱和土在应力和水力路径的作用下均会产生微观孔隙结构的变化,同时,不同的孔隙类型和结构也会对非饱和土宏观水力、力学特性产生不同的影响,尤其是在膨胀土、压实黏土等双孔结构土中,这种影响尤为显著。以Wheeler建立的非饱和土水-力全耦合模型（GCM）为理论框架,引入有效饱和度来描述土体内部宏观和微观孔隙对水-力特性的不同影响,提出考虑孔隙结构影响的Bishop有效应力表达式,建立了各向等压状态下考虑微观结构的非饱和土水-力耦合本构模型,并实现了模型的预测功能。通过与非饱和土等向压缩试验结果的对比,初步验证了所建立模型的合理性和有效性。
    Abstract: Stress and hydraulic paths significantly affect the microstructure of unsaturated soil. On the other hand, different pore types and structures also have different impacts on mechanical and hydraulic behavior of soils with double-pore structures such as expansive soils and compacted soils. Based on the hydro-mechanical coupled constitutive model developed by Wheeler (GCM), the effective degree of saturation considering the different effects of macro and micro pores on the hydro-mechanical characteristics is introduced into the Bishop effective stress equation to take the influence of pore structure into account. On the basis of the effective degree of saturation, a microstructure-dependent hydro-mechanical coupled constitutive model for unsaturated soils is then proposed. The performance of the model is verified by various experimental data of isotropic compression tests and the predictions match the observations well, indicating the validity of the proposed model.
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    • 参考文献(18)
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出版历程
  • 收稿日期:  2017-07-24
  • 发布日期:  2018-04-24

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