Effects of initial density and drying-wetting cycle on soil water characteristic curve of unsaturated loess

LIU Feng-yin; ZHANG Zhao; ZHOU Dong; ZHAO Xu-guang; ZHU Liang

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Effects of initial density and drying-wetting cycle on soil water characteristic curve of unsaturated loess

更新时间：2026-06-25

- Effects of initial density and drying-wetting cycle on soil water characteristic curve of unsaturated loess
- Vol. 32, Issue S2, (2011)
- 作者机构：
  
  1. 西安理工大学岩土工程研究所,西安,710048
  2. 黄河勘测规划设计有限公司,郑州,450003
  3. 中水珠江规划勘测设计有限公司,广州,510610
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU444
- Online First：26 August 2011，
  
  Published：2011
- 稿件说明：
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LIU Feng-yin, ZHANG Zhao, ZHOU Dong, et al. Effects of initial density and drying-wetting cycle on soil water characteristic curve of unsaturated loess[J]. 2011, 32(S2).
DOI：

LIU Feng-yin, ZHANG Zhao, ZHOU Dong, et al. Effects of initial density and drying-wetting cycle on soil water characteristic curve of unsaturated loess[J]. 2011, 32(S2). DOI：

摘要

土-水特征曲线在非饱和土力学中扮演着重要的角色。影响非饱和土土-水特征曲线的因素很多，如初始密度、干湿循环、荷载等。利用GCTS土-水特征曲线仪，主要测定了不同初始干密度的重塑非饱和黄土试样的减湿土-水特征曲线，选取合理的土-水特征曲线模型进行数据拟合，通过分析模型拟合参数来研究初始干密度对非饱和黄土土-水特征曲线的影响；并对给定初始干密度的试样进行了2次干湿循环试验，测定相应的减—增湿土-水特征曲线，通过对比干湿循环曲线上体积含水率的差异，提出了“滞回度”的概念，初步研究了黄土土-水特征曲线在干湿循环下的滞回特性规律。这些成果将为研究应力作用下的土-水特征曲线模型以及考虑干湿循环的力-水耦合本构模型发挥重要作用

Abstract

Soil water characteristic curve (SWCC) plays a significant role in unsaturated soil mechanics. There are several factors influencing the soil water characteristic curve

such as initial density

dry-wetting cycle and stress

etc. A series of tests are carried out by means of GCTS-type SWCC device for soil water characteristic curve for remoulded unsaturated loess specimens at different bulk densities. Based on test results

after a well-adapted selection of soil water characteristic curve model

the influence of initial bulk density on unsaturated loess soil water characteristic curves are studied through analyzing the best-fitting curve parameters. The two drying-wetting cycles tests for a specimen at certain initial density are also carried out; and the corresponding hysteretic curves are obtained. By developing the concept named “degree of hysteresis” and analyzing the differences of volumetric water content in the drying-wetting cycle test

the SWCC hysteresis behaviour of unsaturated loess is preliminarily studied. The aforesaid results may play a significant role in the investigations on stress-dependent soil water characteristic curve model and the force-water coupled constitutive model.

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