冻融循环对原状黄土的持水特性影响

张小辉; 乔斯嘉; 张登飞; 王勇华; 李世雄; 苏铁志

doi:10.16152/j.cnki.xdxbzr.2024-01-002

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冻融循环对原状黄土的持水特性影响

工程地质灾害 | 更新时间：2024-01-18

- 冻融循环对原状黄土的持水特性影响
- Water retention behaviours of intact loess exposed to freeze-thaw cycles
- 西北大学学报（自然科学版） 2024年54卷第1期页码：11-17
- 作者机构：
  
  1.机械工业勘察设计研究院有限公司，陕西　西安　710021
  2.西北大学　地质学系/大陆动力学国家重点试验室，陕西　西安　710069
  3.航天规划设计集团有限公司，北京　100162
- 作者简介：
  
  张小辉，男，高级工程师，从事岩土工程勘察、设计等研究，295069134@qq.com。
  张登飞，男，博士，副教授，博士生导师，从事黄土动力灾害与防控研究，dfzhang87@nwu.edu.cn。
- 基金信息：
  
  国家自然科学基金(42027806;42372324;41907233)
- DOI：10.16152/j.cnki.xdxbzr.2024-01-002
  中图分类号：
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张小辉, 乔斯嘉, 张登飞, 等. 冻融循环对原状黄土的持水特性影响[J]. 西北大学学报（自然科学版）, 2024,54(1):11-17.

ZHANG Xiaohui, QIAO Sijia, ZHANG Dengfei, et al. Water retention behaviours of intact loess exposed to freeze-thaw cycles[J]. Journal of Northwest University (Natural Science Edition), 2024,54(1):11-17.
张小辉, 乔斯嘉, 张登飞, 等. 冻融循环对原状黄土的持水特性影响[J]. 西北大学学报（自然科学版）, 2024,54(1):11-17. DOI： 10.16152/j.cnki.xdxbzr.2024-01-002.

ZHANG Xiaohui, QIAO Sijia, ZHANG Dengfei, et al. Water retention behaviours of intact loess exposed to freeze-thaw cycles[J]. Journal of Northwest University (Natural Science Edition), 2024,54(1):11-17. DOI： 10.16152/j.cnki.xdxbzr.2024-01-002.

摘要

冻融作用是引起黄土边坡溜塌和路基沉陷等工程病害不可忽视的重要因素。持水特性作为分析非饱和黄土水力－力学特性的关键物性，有关冻融作用对黄土持水特性的影响有待深入研究。该文以冻融循环后原状黄土为研究对象，研究了冻融循环次数和冻融前含水率对持水曲线及其特征参数的影响。研究结果表明，冻融循环对持水曲线的影响呈波动性变化，影响程度受控于循环次数与冻融前初始含水率水平；不同冻融条件下饱和度与吸力比(吸力与进气值之比)关系可以归一；通过建立进气值与构度指标之间的定量联系，构建了可统一考虑冻融循环作用影响的修正持水模型；初步证实了冻融循环条件对原状黄土持水曲线的影响，可以通过土的构度指标变化引起进气值的改变来反映。

Abstract

Freeze-thaw acting is an important factor that can’t be ignored in engineering disasters such as loess slope slump and roadbed subsidence. Water retention behaviour is the key physical property for analyzing the hydraulic-mechanical properties of unsaturated loess, and it needs to be further studied that how freeze-thaw cycle affects water retention behaviours of loess. This test took intact loess after freeze-thaw cycles as research objects and studied how both the number of freeze-thaw cycles and the water content before freeze-thaw affect the soil-water retention curve (SWRC) and its characteristic parameters. The results show that the effect of freeze-thaw cycles on SWRC is fluctuating, and the degree of influence is controlled by the number of cycles and the initial water content before freeze-thaw. The relationship between saturation and ratio of suction (ratio between suction and air-entry value) can be normalized under different freeze-thaw conditions. By establishing quantitative relationship between the air-entry value and the structure index, a modified water-retention model was proposed to consider the effect of freeze-thaw cycles uniformly. The effect of freeze-thaw cycle conditions on the SWRC of intact loess is preliminarily confirmed, which can be reflected by the change of air-entry value caused by the change of soil structure index.

关键词

原状黄土冻融循环持水特性

Keywords

intact loessfreeze-thaw cycleswater retention behaviours

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