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高庙子膨润土膨胀力时效性试验研究

赖小玲, 叶为民, 刘毅, 陈宝, 王琼

赖小玲, 叶为民, 刘毅, 陈宝, 王琼. 高庙子膨润土膨胀力时效性试验研究[J]. 岩土工程学报, 2014, 36(3): 574-579. DOI: 10.11779/CJGE201403022
引用本文: 赖小玲, 叶为民, 刘毅, 陈宝, 王琼. 高庙子膨润土膨胀力时效性试验研究[J]. 岩土工程学报, 2014, 36(3): 574-579. DOI: 10.11779/CJGE201403022
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LAI Xiao-ling, YE Wei-min, LIU Yi, CHEN Bao, WANG Qiong. Experimental investigation on ageing effects on swelling pressure of unsaturated GMZ01 bentonite[J]. Chinese Journal of Geotechnical Engineering, 2014, 36(3): 574-579. DOI: 10.11779/CJGE201403022
Citation: LAI Xiao-ling, YE Wei-min, LIU Yi, CHEN Bao, WANG Qiong. Experimental investigation on ageing effects on swelling pressure of unsaturated GMZ01 bentonite[J]. Chinese Journal of Geotechnical Engineering, 2014, 36(3): 574-579. DOI: 10.11779/CJGE201403022
shu

高庙子膨润土膨胀力时效性试验研究  English Version

  • 1. 同济大学岩土及地下工程教育部重点实验室,上海 200092; 2. 教育部城市环境与可持续发展联合研究中心,上海 200092; 3. 灾害防控协同创新中心,四川 成都 610059

基金项目: 国家自然科学基金项目（41030748）; 国防科工局资助项目（科工计[2011]1051号）; 长江学者和创新团队发展计划项目（IRT1029）
详细信息
    作者简介:

    赖小玲（1984- ），女，湖北随州人，博士研究生，从事非饱和土研究工作。E-mail: xllai0284@163.com。

    通讯作者:

    叶为民

  • 中图分类号: TU443

Experimental investigation on ageing effects on swelling pressure of unsaturated GMZ01 bentonite

  • 1. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 2. United Research Center for Urban Environment and Sustainable Development, the Ministry of Education, Shanghai 200092, China; 3. Collaborative Innovation Center of Geohazard Prevention(CICGP), Chengdu 610059, China

摘要

    摘要
  • 摘要: 针对高庙子膨润土在不同含水率和不同干密度条件下膨胀力时效性进行了试验研究。首先采用静力压实法将3种不同含水率的高庙子膨润土粉末压实为两种不同密实状态的试样,随后在保持压实试样的体积和含水率不变的条件下,分别静置0,1,7,15,30和90 d,最后采用膨胀仪对完成静置试样的膨胀力进行量测；同时结合静置过程,完成了部分试样的扫描电镜（SEM）试验。试验结果表明：高庙子膨润土的膨胀力随静置时间的增长不断减小,且前期减小明显,后期逐渐趋于稳定；膨胀力的时效性与试样初始条件有关,试样含水率和干密度越大,膨胀力随静置时间的衰减越明显,即时效性越强。SEM试验结果表明,静置90 d后,高庙子膨润土内的蒙脱石发生了水化,集合体分解,颗粒相互黏结,微观孔隙结构趋于均质化,呈现点阵式的絮状结构；试样静置过程中不同微观结构层次之间的水分重分布导致的蒙脱石水化是高庙子膨润土静置过程中膨胀力降低的主要内在原因。
    Abstract: The ageing effects on the swelling properties of GMZ01 bentonite with different water contents and dry densities are investigated. Firstly, GMZ01 bentonite powder with three different water contents is statically compacted to samples with two dry densities. Then, the compacted samples with different initial conditions are kept for various periods of time (0, 1, 7, 15, 30 and 90 days) under constant volume and water content conditions. Afterwards, the aged samples are subjected to swelling pressure tests using the swelling apparatus. At the same time, the SEM tests are conducted on some samples after experiencing different ageing time. The test results show that the swelling pressure of GMZ01 bentonite decreases with the ageing time. The pressure decreases fast at the early days of ageing and then turns to stabilize after 30 days of ageing. The ageing effects on the swelling pressure of GMZ01 bentonite depend on the initial conditions of the samples. The higher the initial water content and dry density, the stronger the ageing effects. The SEM test results indicate that the smectites hydration occurs in the 90-day aged samples. Aggregates decompose, particles bond with each other and the void distribution seems to be more homogenous, leading to a matrix type macrostructure. The smectites hydration induced by water redistribution between different microstructure levels is the main mechanism for the decrease of the swelling pressure of GMZ01 bentonite.
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出版历程
  • 收稿日期:  2013-08-19
  • 发布日期:  2014-03-19

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