高岭-蒙脱混合黏土渗透各向异性的微观机理研究

周建; 徐杰; 余良贵; 罗凌晖

doi:10.11779/CJGE201906003

高岭-蒙脱混合黏土渗透各向异性的微观机理研究 English Version

周建^1,2,
徐杰^1,2,
余良贵^1,2,
罗凌晖^1,2

1. 浙江大学滨海和城市岩土工程研究中心,浙江杭州 310058;
2. 浙江省城市地下空间开发工程技术研究中心,浙江杭州 310058

基金项目: 2016国家重点研发计划项目（2016YFC0800203）; 国家自然科学基金重点项目（51338009）

详细信息

作者简介:
周建(1970— ),女,教授,从事软黏土力学,软土地基处理,非饱和土本构模型等研究。E-mail：zjelim@zju.edu.cn。

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- 收稿日期: 2018-09-10
- 发布日期: 2019-06-24

Microscopic mechanism regarding permeability anisotropy of kaolin-montmorillonite mixed clays

1. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China;
2. Engineering Research Center of Urban Underground Development of Zhejiang Province, Hangzhou 310058, China

摘要

摘要: 为研究高岭-蒙脱混合黏土中膨润土掺入量及固结应力对渗透各向异性比的影响,利用三轴渗透仪对高岭-蒙脱混合黏土展开一系列渗流试验,并从微观结构的改变上进行机理解读,研究发现：①加入膨润土后,渗透系数及渗透各向异性比明显减小,但随着膨润土掺入量的增加,渗透各向异性比趋于稳定,原因是影响渗透各向异性比的有效孔隙权重比趋于不变,导致渗透各向异性比不再发生明显改变;②随着有效固结应力的增大,混合黏土的渗透各向异性比不断增大。有效固结应力增大时,有效孔隙面积比和有效孔隙权重比均在增加,导致固结应力增大时渗透各向异性比增大;③综合膨润土掺入量及固结应力对混合黏土渗透各向异性比的影响,若从微观结构上定量分析,建议采用有效孔隙权重比作为微观参数。
- 混合黏土 /
- 渗透各向异性 /
- 固结应力 /
- 微观结构 /
- 有效孔隙面积比 /
- 有效孔隙权重比
Abstract: A series of experiments are conducted by using the triaxial permeameters to study the influences of the incorporation ratio of bentonite and the effective consolidation stress on permeability anisotropy, and the corresponding microscopic mechanisms are investigated. The results show that: (1) When the bentonite is added, the permeability coefficient and permeability anisotropy of the mixed soil decrease significantly, but with the increasing incorporation ratio of bentonite, the permeability anisotropy tends to be stable because the effective pore proportion ratio tends to remain constant. (2) With the increasing effective consolidation stress, the permeability anisotropy of the mixed soil increases. When the effective consolidation stress increases, both the effective pore area ratio and the effective pore proportion ratio increase, which indicates that the ratio of vertical to horizontal effective pore areas is increasing. (3) Considering the influences of the incorporation ratio of bentonite and the effective consolidation stress comprehensively, if intending to quantitatively analyze the impact of these two factors from the perspective of microscopic analysis, it is recommended to use the effective pore proportion ratio as the parameter of microstructure.
- mixed clay /
- permeability anisotropy /
- consolidation stress /
- microstructure /
- effective pore area ratio /
- effective pore proportion ratio

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高岭-蒙脱混合黏土渗透各向异性的微观机理研究 English Version

作者简介: 周 建(1970— ),女,教授,从事软黏土力学,软土地基处理,非饱和土本构模型等研究。E-mail：zjelim@zju.edu.cn。

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Microscopic mechanism regarding permeability anisotropy of kaolin-montmorillonite mixed clays

期刊类型引用(8)

其他类型引用(15)

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出版历程

目录

作者简介:
周建(1970— ),女,教授,从事软黏土力学,软土地基处理,非饱和土本构模型等研究。E-mail：zjelim@zju.edu.cn。