全吸力范围红黏土干湿循环土-水特征曲线

蔡国庆; 刘祎; 徐润泽; 李舰; 赵成刚

doi:10.11779/CJGE2019S2004

全吸力范围红黏土干湿循环土-水特征曲线 English Version

蔡国庆^{1, 2},
刘祎²,
徐润泽³,
李舰²,
赵成刚^{2, 4}

1. 北京交通大学城市地下工程教育部重点实验室,北京 100044;
2. 北京交通大学土木建筑工程学院,北京 100044;
3. 济南高新控股集团有限公司,山东济南 250101;
4. 桂林理工大学土木与建筑工程学院,广西桂林 541004

基金项目: 国家自然科学基金项目（51722802,51678041）; 河南省交通运输厅科技计划项目（2017B4）

详细信息

作者简介:
蔡国庆(1983— ),男,博士,教授,博士生导师,主要从事非饱和土力学及土体多场耦合理论方面的研究工作。E-mail：guoqing.cai@bjtu.edu.cn。

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出版历程
- 收稿日期: 2019-04-28
- 发布日期: 2019-07-19

Experimental investigation for soil-water characteristic curve of red clay in full suction range

1. Key Laboratory of Urban Underground Engineering of Ministry of Education, Beijing Jiaotong University, Beijing 100044, China;
2. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China;
3. Jinan Hi-tech Holding Group, Jinan 250101, China;
4. School of Civil Engineering, Guilin University of Technology, Guilin 541004, China

摘要

摘要: 采用轴平移法、滤纸法以及饱和盐溶液蒸汽平衡法3种方法相结合,对单峰（泥浆土）和双峰（压实土）孔隙结构的重塑红黏土土样进行了一系列室内试验,研究了全吸力范围内（0~286.7 MPa）孔隙结构和初始孔隙比对土-水特征曲线（SWCC）的影响,分析了干湿循环下两种土的滞回性及体积变化规律。试验结果表明：不论泥浆土还是压实土,初始孔隙比对SWCC的影响均主要体现在低吸力阶段;孔隙结构对SWCC影响显著,压实土和泥浆土的SWCC分别呈现“双台阶”和“单台阶”特征;初始孔隙比相同时,泥浆土的进气值更大,持水性能更好;干湿循环下压实土的滞回性明显小于泥浆土,但泥浆土的体变更大。
- 非饱和土 /
- 全吸力范围 /
- 红黏土 /
- 土-水特征曲线 /
- 干湿循环
Abstract: A series of laboratory tests using the axial translation method, filter paper method and vapor equilibrium method on red clay including a unimodal (slurry) and a bimodal (compacted soil) pore-size distribution are performed to investigate the influences of the initial void ratio and pore structure on the soil-water characteristic curves (SWCCs) in the full suction range of 0~286.7 MPa as well as the hysteresis effect and volume variation during wetting-drying cycles. The test results show that whether the slurry or compacted soil, the influences of the initial void ratio on the SWCCs are mainly reflected in the lower suction range. The pore structure has significant influences on the SWCCs, and the SWCC of compacted soil and slurry are characterized by "double steps" and "single step". The air entry value and water holding capacity of slurry are greater compared to those of compacted soil with the same initial void ratio. The hysteresis effect of the compacted soil is obviously smaller than that of slurry, but the volume variation of slurry is larger during wetting-drying cycles.
- unsaturated soil /
- full suction range /
- red clay /
- soil-water characteristic curve /
- drying-wetting cycle

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参考文献(9)

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