岩土力学 ›› 2020, Vol. 41 ›› Issue (2): 469-476.doi: 10.16285/j.rsm.2019.0056

• 基础理论与实验研究 • 上一篇    下一篇

高岭-蒙脱混合黏土渗透各向异性模型研究

徐杰1, 2,周建1, 2,罗凌晖1, 2,余良贵1, 2   

  1. 1. 浙江大学 滨海和城市岩土工程研究中心,浙江 杭州 310058; 2. 浙江大学 浙江省城市地下空间开发工程技术研究中心,浙江 杭州 310058
  • 收稿日期:2019-01-10 修回日期:2019-04-29 出版日期:2020-02-11 发布日期:2020-02-08
  • 通讯作者: 周建,女,1970年生,博士,教授,主要从事软黏土力学、软土地基处理及非饱和土本构模型等方面的研究。E-mail:zjelim@zju.edu.cn E-mail:981730290@qq.com
  • 作者简介:徐杰,男,1993年生,硕士研究生,主要从事软黏土渗透特性等方面的研究
  • 基金资助:
    国家重点研发计划项目(No. 2016YFC0800203);国家自然科学基金(No. 51338009)。

Study on anisotropic permeability model for mixed kaolin-montmorillonite clays

XU Jie1, 2, ZHOU Jian1, 2, LUO Ling-hui1, 2, YU Liang-gui1, 2   

  1. 1. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou, Zhejiang 310058, China; 2. Engineering Research Center of Urban Underground Development of Zhejiang Province, Zhejiang University, Hangzhou, Zhejiang 310058, China
  • Received:2019-01-10 Revised:2019-04-29 Online:2020-02-11 Published:2020-02-08
  • Contact: ZHOU Jian, female, born in 1970, Professor, PhD supervisor, Research interests: soft clay mechanics, soft soil foundation treatment and unsaturated soil constitutive model. E-mail: zjelim@zju.edu.cn E-mail:981730290@qq.com
  • About author:XU Jie, male, born in 1993, Postgraduate, Majoring in the permeability of soft clay. E-mail: 981730290@qq.com
  • Supported by:
    This work was supported by the National Key Research and Development Program of China (2016YFC0800203) and the National Natural Science Foundation of China (51338009).

摘要: 完善的渗透各向异性模型有助于指导地下建筑施工期和运营期的排水注浆方案的选定,为了建立完善的渗透各向异性模型,利用三轴渗透仪对高岭-蒙脱混合黏土开展一系列渗透试验,并从宏观和微观两个角度尝试建立渗透各向异性模型。研究结果表明:随着膨润土掺入量增加,混合黏土中小孔隙含量不变,中孔隙含量增多,而大孔隙含量减少;随着固结应力的增大,混合黏土中孔隙均减少,且孔隙最大孔径减小;宏观参数孔隙比和液限孔隙比与渗透各向异性比之间的规律性较弱,说明孔隙比和液限孔隙比不是决定渗透各向异性比的关键参数;用微观参数表述的渗透各向异性模型有较强的规律性,说明从微观角度探究渗透各向异性模型不仅可行,而且更能揭示混合黏土渗透各向异性的本质,且微观参数模型中,用能反映较大孔隙变化的孔径指数 ~ 表述的渗透各向异性模型相关性最好。

关键词: 混合黏土, 渗透各向异性模型, 宏观参数, 微观参数, 孔径指数

Abstract: A perfect anisotropic permeability model is helpful to guide the drainage and grouting scheme of underground buildings during construction and operation period. To study permeability anisotropy model, mixed kaolinite-montmorillonite clays were used in a series of permeation experiments by triaxial permeameter, and the development of anisotropic permeability model was attempted from both macroscopic and microscopic perspectives. The results show that: as the amount of bentonite increases, the small pores increase, but the large pores decrease; as the consolidation stress increases, all pores decrease, and the maximum pore size decreases. Macroscopically there is no correlation between the void ratio considering the liquid limit void ratio and the permeability anisotropic ratio, which indicates that the void ratio e and liquid limit void ratio are not the key parameter determining the permeability anisotropy ratio. The permeability anisotropy model expressed by microscopic parameters indicates that it is not only feasible to explore the permeability anisotropy model from the microscopic point, but also to reveal the essence of permeability anisotropy. In all microscopic models, the permeability anisotropy model expressed by pore index - is well correlated, which can reflect changes in larger pores.

Key words: mixed clay, permeability anisotropy model, macroscopic parameter, microscopic parameter, pore index

中图分类号: 

  • TU 411
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