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干湿循环条件下高压实膨润土的微观结构特征

叶为民, 万敏, 陈宝, 崔玉军, 王驹

叶为民, 万敏, 陈宝, 崔玉军, 王驹. 干湿循环条件下高压实膨润土的微观结构特征[J]. 岩土工程学报, 2011, 33(8): 1173-1177.
引用本文: 叶为民, 万敏, 陈宝, 崔玉军, 王驹. 干湿循环条件下高压实膨润土的微观结构特征[J]. 岩土工程学报, 2011, 33(8): 1173-1177.
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YE Wei-min, WAN Min, CHEN Bao, CUI Yu-jun, WANG Ju. Micro-structural behaviors of densely compacted GMZ01 bentonite under drying/wetting cycles[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(8): 1173-1177.
Citation: YE Wei-min, WAN Min, CHEN Bao, CUI Yu-jun, WANG Ju. Micro-structural behaviors of densely compacted GMZ01 bentonite under drying/wetting cycles[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(8): 1173-1177.
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干湿循环条件下高压实膨润土的微观结构特征  English Version

  • 1. 同济大学岩土工程重点实验室，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. 法国国立路桥大学，巴黎； 4. 核工业北京地质研究院，北京 100029

基金项目: 国家 自然科学基金项目（ 40772180 ， 40802069 ， 41030748 ）;国防科工委开放基金（科工计 [2007]831 号）；上海市重点学科（地质工程）资助项目（ B308 ）
详细信息
    作者简介:

    叶为民 (1963 – ) ，男，博士，教授，博士生导师，主要从事环境地质、非饱和土力学方面的教学与研究工作。

  • 中图分类号: TD853.34

Micro-structural behaviors of densely compacted GMZ01 bentonite under drying/wetting cycles

  • 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, Ministry of Education, Shanghai 200092, China; 3. Ecole Nationale des Ponts et Chauss ? es, Paris, France; 4. Beijing Research Institute of Uranium Geology, Beijing 100029, China

摘要

    摘要
  • 摘要: 采用温度、吸力控制方法，试验研究了在不同温度、不同侧限约束条件下的高压实高庙子膨润土微观结构在干湿循环作用下的变化规律。结果表明，特定温度下、高吸力（＞ 5 MPa ）范围内，干湿循环路径对无侧限、高压实膨润土集合体内孔隙与集合间孔隙的影响存在明显差异。吸湿过程中，试样内部不同孔径的孔隙均发生了不同程度的膨胀；脱湿过程中，孔隙出现分化，部分较大孔径（＞ 3000 nm ）的孔隙收缩，而集合体内孔隙基本不受吸力增加的影响。相同侧限条件下，温度对干湿循环路径对高压实膨润土微结构的影响效果具有明显的放大作用，即温度越高、干湿循环路径对高压实膨润土微结构的影响作用越明显。
    Abstract: With temperature and suction control, the evaluation of microstructure of densely compacted GMZ01 bentonite under different constraint conditions is conducted under wetting/drying cycles. The results indicate that for high suction (> 5 MPa), there is a significant difference between the effects of the drying/wetting cycles on the inter-aggregate pores and the intra-aggregate pores. Following the wetting path, all the pores with different sizes expand at different levels. While following the drying process, some inter-aggregate pores with larger size (>3000 nm) shrink, but the intra-aggregate pores almost do not change with the increase of suction. For confined GMZ01 bentonite specimen, when it hydrates to 5.1 MPa, the swelling of aggregates squeezes into the large pores, which causes the volume of inter-aggregate pores to reduce rapidly. However, the volume of the intra-aggregate pores almost unchanges. After that, when the specimen dehydrates to 103 MPa, the volume of intra-aggregate pores still unchanges. While the inter-aggregates pores differentiate, some of the lager pores (＞2000 nm) shrink into smaller pores (300 nm
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    • 参考文献(20)
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  • 发布日期:  2011-08-14

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