固结作用下粉土的持水性能与细观机制研究

›› 2013, Vol. 34 ›› Issue (11): 3077-3084.

固结作用下粉土的持水性能与细观机制研究

谈云志¹，胡新江¹，喻波¹，张华¹，付伟²

1. 三峡大学三峡库区地质灾害教育部重点实验室，湖北宜昌 443002；2. 中交第二公路勘察设计研究院有限公司，武汉 430056

收稿日期:2013-04-24 出版日期:2013-11-09 发布日期:2013-11-11
作者简介:谈云志，男，1979年生，博士，副教授，主要从事特殊土方面的教学与科研工作。
基金资助:
国家自然科学基金项目(No. 51009084)；中国博士后科学基金项目(No. 2013M542057)；湖南省交通科技项目(No. 201045，No. 200910)；三峡大学硕士学位论文培优基金项目(No. 2012PY015)。

Water retention properties and mesomechanism of silt under consolidation effect

TAN Yun-zhi¹，HU Xin-jiang¹，YU Bo¹，ZHANG Hua¹，FU Wei²

1. Key Laboratory of Geological Hazards on Three Gorges Reservoir Area, Ministry of Education, China Three Gorges University, Yichang, Hubei 443002, China; 2. CCCC Second Highway Consultants Co., Ltd., Wuhan 430056, China

Received:2013-04-24 Online:2013-11-09 Published:2013-11-11

摘要/Abstract

摘要： 针对传统仪器无法考虑岩土工程中温度和荷载等因素综合作用的缺陷，研制了一套多功能土-水特征曲线试验仪。以粉土为研究对象，开展了不同固结应力作用下粉土的土-水特征曲线试验，并测量其增减湿过程中土体的体积胀缩量，以便修正体积变化对其体积含水率的计算误差。结果表明，粉土在减湿过程中，土体的体积发生明显的收缩。其收缩量与固结应力水平有关，固结应力越小，则减湿引起的体缩量越大。但土体在增湿过程中的体积则基本保持不变。固结应力对粉土土-水特征曲线的进气值、增减湿速率影响较大，固结压力越大，其进气值越大、减湿速率也越大。最后，为揭示固结应力对土的持水性能的影响机制，开展了不同固结应力作用下土体的细观试验。结果表明，固结应力主要改变了土体团粒间的大孔隙，而对黏土颗粒之间的孔隙影响较小。土体的持水性能与土体的孔隙大小和分布模式密切相关，大孔隙主要影响土体的进气值，而其孔隙分布模式则控制其增减湿湿速率。

关键词: 土-水特征曲线, 固结应力, 増（减）湿变形, 孔隙分布, 持水机制

Abstract: In light of traditional instrument which can’t consider the factors of stress and temperature in the geotechnical engineering, a set of multifunctional soil-water characteristic curve test instrument is developed. Taking silt as study object, the soil-water characteristic curve tests under the effect of different consolidation stresses are carried out. The volume shrinkage deformation is also measured at the same time so as to amend miscount caused by volume change. It is found that the shrinkage is obvious in the drying process; and the smaller consolidation stress is, the more shrinkage is. But the soil volume remains unchanged in the wetting process. The consolidation stress has a great influence on the air-entry value and wetting (drying) rates. The air-entry value and wetting (drying) rates are greater when the consolidation stress increases. Finally, the mesoscopic tests under the action of different consolidation stresses are carried out for revealing its influence mechanism. The test results show that the large pore between the soil aggregate is compressed mainly by consolidation stress; but the pore between soil particles is less effect by it. The soil-water properties are related to the pore size and its distribution mode closely. The large pore has influence on the air-entry value and the distribution mode has influence on the wetting (drying) rates.

Key words: soil-water characteristic curve, consolidation stress, wetting (drying) deformation, pore distribution, water retention mechanism

中图分类号:

TU 411

谈云志，胡新江，喻波，张华，付伟 . 固结作用下粉土的持水性能与细观机制研究[J]. , 2013, 34(11): 3077-3084.

TAN Yun-zhi ，HU Xin-jiang ，YU Bo ，ZHANG Hua ，FU Wei . Water retention properties and mesomechanism of silt under consolidation effect[J]. , 2013, 34(11): 3077-3084.

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