考虑初始干密度影响的SWCC预测方法研究

蔡国庆; 张策; 李舰; 赵成刚

doi:10.11779/CJGE2018S2006

考虑初始干密度影响的SWCC预测方法研究 English Version

蔡国庆^1,2,
张策²,
李舰^1,2,
赵成刚^2,3

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. 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（51722802,51678041,51608033）, 河南省交通运输科技计划项目（2017B4）,北京市自然科学基金面上项目（8162032）

详细信息

作者简介:
蔡国庆(1983- ),博士,教授,博士生导师,主要从事非饱和土力学、土体多场耦合理论及应用等方面的教学和科研工作。E-mail: guoqing.cai@bjtu.edu.cn。

中图分类号: TU431
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出版历程
- 收稿日期: 2018-07-21
- 发布日期: 2018-10-29

Prediction method for SWCC considering initial dry density

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. School of Civil Engineering, Guilin University of Technology, Guilin 541004, China

摘要

摘要: 首先研究了3个典型的土水特征曲线模型（van Genuchten模型、Fredlund-Xing模型和Brooks-Corey模型）对不同类型土（黏土、粉土及砂土）的SWCC拟合效果。其次,为了分析各模型对SWCC的干密度相关性拟合效果,讨论了各模型的参数随土体初始孔隙比的变化规律。最后,提出了一种考虑初始干密度影响的SWCC预测方法。方法中假定同一吸力下初始孔隙比与饱和度间存在着线性对应的关系。并且利用该方法对试验结果进行了验证,证实了其合理性。
- 非饱和土 /
- 土-水特征曲线 /
- 初始干密度 /
- 基质吸力
Abstract: With the development of urbanization and industrialization, many engineering problems about unsaturated soils are often encountered in practical projects. Engineering accidents related to unsaturated soils have also appeared in highway and railway projects, causing huge economic losses and casualties. Firstly, the fitting results of three SWCC equations (van Genuchten equation, Fredlund-Xing equation and Brooks-Corey equation) on the test results of different types of soils (clay, silt and sand) are studied. Secondly, in order to analyze the fitting effect of each SWCC equation for the dependency of the initial dry density, the variations of model parameters with the initial void ratio of soils in each equation are discussed. Finally, a prediction method for SWCC considering the influence of the initial dry density is proposed, which assumes a linear relationship between the initial void ratio and the saturation under the same suction. This method is verified by the comparison between the predicted and test results.
- unsaturated soil /
- soil-water characteristic curve /
- initial dry density /
- matrix suction

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参考文献(14)

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