土体的冻结特征曲线和持水特性

马田田; 韦昌富; 周家作; 田慧会

doi:10.11779/CJGE2015S1033

土体的冻结特征曲线和持水特性 English Version

马田田^{1, 2},
韦昌富^{1, 2, 3},
周家作^{1, 2},
田慧会^{1, 2}

1. 中国科学院武汉岩土力学研究所,湖北武汉 430071; 2. 岩土力学与工程国家重点实验室,湖北武汉 430071; 3. 桂林理工大学土木与建筑工程学院,广西桂林541004

基金项目: 国家重点基础研究发展计划（“973”计划）项目（2012CB026102）; 国家自然科学基金项目（11302243,11372078）

详细信息

作者简介:
马田田(1986- ),女,助理研究员,主要从事非饱和土力学方面的研究工作。

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出版历程
- 收稿日期: 2015-03-25
- 发布日期: 2015-07-24

Freezing characteristic curves and water retention characteristics of soils

MA Tian-tian^{1, 2},
WEI Chang-fu^{1, 2, 3},
ZHOU Jia-zuo^{1, 2},
TIAN Hui-hui^{1, 2}

1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Wuhan 430071, China; 2. Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 3. College of Civil and Architectural Engineering, Guilin University of Technology, Guilin 541004, China

摘要

摘要: 土水特征曲线（SWCC）是一个很重要的本构关系,表征土体的持水特性。定义为孔隙水势能与含水率之间的关系,在非饱和土中可以用来描述流动现象以及力学行为等。另外,冻土的冻结特征曲线（SFC）表示液态水的势能与未冻水含量之间的关系,也可以作为持水特性的表征。采用压力板仪和蒸汽平衡法获得整个含水率范围内黏土和粉土的土水特征曲线;同时采用低温恒温冷浴结合核磁共振系统（NMR）获得粉土和黏土的冻结特征曲线。根据冻土的冻融循环与土体的干湿循环特性的相似性,通过测量到的温度利用Clapeyron方程来计算对应含水率下的孔隙水势能。采用该冻结方法得到的孔隙水势能和含水率之间的关系与测试到的SWCC对比可知,由于气体或冰的存在使得孔隙水的势能不同,这可能是由于冰和气体使得土颗粒对孔隙水的相互作用不同。根据表面化学的概念,提出分子间作用力与吸附水膜厚度之间的关系,用来描述处于吸附状态的持水特性。
- 冻结特征曲线 /
- 土水特征曲线 /
- 孔隙水势能 /
- 分子间作用力 /
- 核磁共振
Abstract: The soil-water characteristic curve (SWCC) is an important constitutive model for unsaturated soils. It represents the water retention capacity of soils, which defines the relationship between pore water potential and water content and can be capable to describe the transport phenomena and the mechanical behavior of unsaturated soils. The soil freezing characteristic (SFC) expresses the relationship between the quantity and the energy status of liquid water in frozen soils, which also represents the water retention behavior. The soil-water characteristic curves over the full water content range of silt and clay are obtained by using the pressure plate extractor and vapor equilibrium method. The soil freezing characteristic curves are obtained by the temperature control bath combining with the low-field nuclear magnetic resonance (NMR) system. Based on the similarity between the freezing/thawing and drying/wetting behavior, the corresponding energy status of pore water at the specified water content is inferred from soil temperature measurements with the Clapeyron equation. The relationship between pore water potential and water content obtained by the freezing method is compared with the measured SWCC, showing that the pore water potentials are different due to the existence of air and ice at the other side of the water film (different soil-water interactions). Based on the concept of surface chemistry, a relationship between the intermolecular force and the water film thickness is developed, which can be capable to describe the water retention behavior under adsorption condition.
- freezing characteristic curve /
- soil-water characteristic curve /
- pore water potential /
- intermolecular force /
- NMR

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参考文献(19)

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