高吸力下高庙子钙基膨润土的土水-力学特性

孙文静; 孙德安; 刘仕卿; 方雷

doi:10.11779/CJGE201402012

高吸力下高庙子钙基膨润土的土水-力学特性 English Version

上海大学土木工程系,上海200072

基金项目: 国家自然科学基金项目（41102163）

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作者简介:
孙文静(1981- )，女，山东青岛人，博士，硕士生导师，主要从事非饱和土力学的研究工作。E-mail: wjsun@shu.edu.cn。

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- 收稿日期: 2013-06-15
- 发布日期: 2014-02-20

Hydro-mechanical behaviour of GMZ Ca-bentonite at high suctions

Department of Civil Engineering, Shanghai University, Shanghai 200072, China

摘要

摘要: 高庙子钙基膨润土具有明显的湿胀干缩特性,吸力变化会引起持水状态和孔隙比的变化。用蒸汽平衡法测得高吸力段（3～287 MPa）高庙子钙基膨润土的土水特性和变形特性。分析比较了吸力路径、试样初始孔隙比、应力加载历史以及土体结构对土水特性、变形及吸力应力的影响。研究表明,脱湿和吸湿过程中孔隙比的差异会引起体积含水率和饱和度的滞回。饱和度与吸力间关系受试样初始孔隙比和孔隙结构影响较大,与应力加载历史无直接关系。由吸力引起的吸力应力随吸力的增大而非线性增大,并在较高吸力时趋向于一定值。吸力应力受吸力路径、初始孔隙比以及孔隙结构的影响。
- 高庙子钙基膨润土 /
- 蒸汽平衡法 /
- 土水特征曲线 /
- 吸力应力 /
- 平均骨架应力
Abstract: Gaomiaozi (GMZ) Ca-bentonite has obvious swelling and shrinkage characteristics. The change in suction can induce changes in water retention state and void ratio. Soil-water characteristics of GMZ Ca-bentonite at high suctions (3～287 MPa) are measured by the vapor equilibrium technique. The influential factors such as drying-wetting process, initial void ratio, stress loading history and pore structure are analyzed respectively on the soil-water characteristics and mechanical behaviour. The main conclusions are as follows: (1) the difference in void ratio during drying and wetting process can bring about hysteresis in volumetric water content and degree of saturation; (2) the relationship between degree of saturation and suction is mainly determined by the pore structure and void ratio, which has no direct relation with the experienced stress loading history; (3) the soil-water characteristic curve (SWCC) can reflect the deformation characteristics with suction. Moreover, the existence of suction in samples can produce suction stress. The suction stress increases nonlinearly with the increasing suction and reaches a certain value at higher suction; (4) the suction stress due to suction is affected by the factors such as suction path, initial void ratio and pore structure.
- GMZ Ca-bentonite /
- vapor equilibrium technique /
- SWCC /
- suction stress /
- average skeleton stress

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高吸力下高庙子钙基膨润土的土水-力学特性 English Version

作者简介: 孙文静(1981- )，女，山东青岛人，博士，硕士生导师，主要从事非饱和土力学的研究工作。E-mail: wjsun@shu.edu.cn。

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Hydro-mechanical behaviour of GMZ Ca-bentonite at high suctions

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作者简介:
孙文静(1981- )，女，山东青岛人，博士，硕士生导师，主要从事非饱和土力学的研究工作。E-mail: wjsun@shu.edu.cn。