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一个非饱和结构性黄土三维胶结接触模型

蒋明镜, 孙若晗, 李涛, 刘俊

蒋明镜, 孙若晗, 李涛, 刘俊. 一个非饱和结构性黄土三维胶结接触模型[J]. 岩土工程学报, 2019, 41(S1): 213-216. DOI: 10.11779/CJGE2019S1054
引用本文: 蒋明镜, 孙若晗, 李涛, 刘俊. 一个非饱和结构性黄土三维胶结接触模型[J]. 岩土工程学报, 2019, 41(S1): 213-216. DOI: 10.11779/CJGE2019S1054
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JIANG Ming-jing, SUN Ruo-han, LI Tao, LIU Jun. A three-dimensional cementation contact model for unsaturated structural loess[J]. Chinese Journal of Geotechnical Engineering, 2019, 41(S1): 213-216. DOI: 10.11779/CJGE2019S1054
Citation: JIANG Ming-jing, SUN Ruo-han, LI Tao, LIU Jun. A three-dimensional cementation contact model for unsaturated structural loess[J]. Chinese Journal of Geotechnical Engineering, 2019, 41(S1): 213-216. DOI: 10.11779/CJGE2019S1054
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一个非饱和结构性黄土三维胶结接触模型  English Version

  • 1. 天津大学建筑工程学院土木系,天津 300072;
    2. 天津大学水利工程仿真与安全国家重点实验室,天津 300072;
    3. 同济大学土木工程学院地下建筑与工程系,上海 200092

基金项目: 国家自然科学基金重点项目（51639008）; 国家自然科学基金项目（51579178,51809193）
详细信息
    作者简介:

    蒋明镜(1965—),男,教授,博士生导师,主要从事天然结构性黏土、砂土、非饱和土、太空土和深海能源土宏观微观试验、本构模型和数值分析研究。E-mail：mingjing.jiang@tju.edu.cn。

    通讯作者:

    李涛，E-mail：letllejn@163.com

A three-dimensional cementation contact model for unsaturated structural loess

  • 1. Department of Civil Engineering, School of Civil Engineering, Tianjin University, Tianjin 300072, China;
    2. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China;
    3. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China

摘要

    摘要
  • 摘要: 对非饱和结构性黄土进行离散元模拟需要合理的三维胶结接触模型。在含抗转动和抗扭转模型基础上引入了颗粒间吸引力以考虑范德华力和毛细力作用;提出了考虑胶结尺寸影响的胶结刚度和强度公式,考虑了不可恢复的化学胶结作用;建立了可以全面考虑含水率-孔隙比-吸力耦合作用的黄土接触模型。通过开展常规三轴压缩以及在不同偏应力水平下湿陷试验的三维离散元模拟,表明该三维接触模型可以较好地反映室内试验中非饱和结构性黄土的主要力学特性。
    Abstract: An adaptable three-dimensional (3D) contact model is necessary to perform discrete element simulation (DEM)on unsaturated structural loess, in which the effects of adhesive force and chemical cementation bond have to be taken into account. A 3DDEM contact model is introduced to simulate the macroscopic and microscopic mechanical behaviors of unsaturated and structural loess by considering the effects of adhesive force and chemical cementation. Interparticle adhesive force is composed of van der Waals attractions and capillary forces. Both bond stiffness and strength are associated with the bond size to represent unrecoverable chemical cementation. By using the relationships between water content and suction, a new 3D contact model for loess is established considering the coupling effects of water content-void ratio-suction. The DEM is used to simulate the triaxial and wetting tests at different deviator stress levels and the results show that the 3D contact model can well reproduce the macroscopic mechanical behaviors of unsaturated structural loess.
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    • 参考文献(11)
  • [1] BARDEN L, MCGOWN A, COLLINS K.The collapse mechanism in partly saturated soil[J]. Engineering Geology, 1973, 7(1): 49-60.
    [2] DELENNE J Y, EIYOUSSOUFI M S, CHERBLANC F, et al.Mechanical behaviour and failure of cohesive granular materials[J]. International Journal for Numerical and Analytical Methods in Geomechanics, 2004, 28(15): 1577-1594.
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    [7] 李涛. 非饱和结构性黄土三维离散元模拟与本构模型研究[D]. 上海: 同济大学, 2017.
    (LI Tao.Three-dimensional DEM simulation and constitutive model of unsaturated structural loess[D]. Shanghai: Tongji University, 2017. (in Chinese))
    [8] JIANG M J, KONRAD J M, LEROUEIL S.An efficient technique for generating homogeneous specimens for DEM studies[J]. Computers and Geotechnics, 2003, 30(7): 579-597.
    [9] VAN GENUCHTEN M T. A closed-form equation for predicting the hydraulic conductivity of unsaturated soils[J]. Soil Science Society of America Journal, 1980, 44(5): 892-898.
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    [11] 张苏民, 郑建国. 力和水作用先后次序对湿陷性黄土力学性状的影响[J]. 勘察科学技术, 1990, 3: 10-14.
    (ZHANG Su-min, ZHENG Jian-guo.Influence of order of force and water on mechanical properties of collapsible loess[J]. Site Investigation Science and Technology, 1990, 3: 10-14. (in Chinese))
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出版历程
  • 收稿日期:  2019-04-29
  • 发布日期:  2019-07-14

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