非饱和土孔隙比与基质吸力关系的通用模型

叶云雪; 邹维列; 韩仲; 刘小文

doi:10.11779/CJGE201905016

非饱和土孔隙比与基质吸力关系的通用模型 English Version

叶云雪¹,
邹维列^1,2, ,,
韩仲¹,
刘小文³

1．武汉大学土木建筑工程学院,湖北武汉 430072;
2. 西京学院土木工程学院,陕西西安710123;
3. 南昌大学建筑工程学院,江西南昌 330031

基金项目: 国家自然科学基金项目（51479148,51779191）

详细信息

作者简介:
叶云雪(1988— ),男,博士研究生,主要从事非饱和土特性方面的研究。E-mail: yeyunxeu@163.com。

通讯作者:
邹维列，E-mail：zwilliam@126.com

中图分类号: TU43
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出版历程
- 收稿日期: 2018-05-13
- 发布日期: 2019-05-24

General model for relationship between void ratio and matric suction in unsaturated soils

1. School of Civil Engineering, Wuhan University, Wuhan 430072, China;
2. School of Civil Engineering, Xijing University, Xi’an 710123, China;
3. School of Architectural Engineering, Nanchang University, Nanchang 330031, China

摘要

摘要: 基于土的土-水特征曲线（SWCC）和收缩特征曲线（SSCC）的特点及二者之间的联系,采用三直线的分段SSCC模型及非饱和土的三相比例公式,推导出了反映非饱和土孔隙比与基质吸力关系的通用模型。为了证实所提出模型的可靠性,采用GDS三轴仪进行了一系列吸力平衡试验,并对所提出模型的理论假设进行了验证。试验结果表明：利用该假设并通过吸力平衡下试样的排水量,可以准确地预测饱和试样在某一基质吸力和净围压共同作用下的体积变化量、进气量和总体变,证明了所提出模型的假设是成立的,且假设中的系数u具有明确的物理意义。
- 非饱和土 /
- 土-水特征曲线 /
- 收缩特征曲线 /
- 孔隙比 /
- 基质吸力
Abstract: A general model is proposed to simulate the dependence of void ratio on matric suction for unsaturated soils. This model can be derived based on (i) the characteristics and the relationship between soil-water characteristic curve (SWCC) and soil shrinkage characteristic curve (SSCC) and (ii) a SSCC formula using a three-segment linear model, and a three-phase basic formula for unsaturated soils. A series of unsaturated tests are conducted by using the triaxial apparatus on a red clay to further verify the theoretical assumption required for the proposed model. Only one parameter u is required in the theoretical assumption and has a clear physical meaning, which can be calibrated using the conventional SWCC tests. Based on the assumption with the amount of drainage of saturated samples at a given suction, the bulk volume change, the amount of the air entry into the soil and the total volumetric strain can be accurately predicted. The validity and application of the assumption are demonstrated by these tests, and hence the proposed assumption-based model is also validated.
- unsaturated soil /
- soil-water characteristic curve /
- shrinkage characteristic curve /
- void ratio /
- matric suction

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参考文献(24)

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