Hysteresis Effect of Unfrozen Water Content in Soil Based on Pore Structure

被引：0

作者：

Kou J.-Y. ^{[1
]}

Ma X.-Y. ^{[1
]}

Teng J.-D. ^{[2
,3
]}

Zhang S. ^{[2
,3
]}

Li X. ^{[4
]}

机构：

[1] Department of Geotechnical Engineering, China Airport Planning & Design Institute Co. Ltd., Beijing

[2] School of Civil Engineering, Central South University, Changsha

[3] National Engineering Laboratory for High Speed Railway Construction, Central South University, Changsha

[4] School of Traffic and Transportation, Changsha University of Science & Technology, Changsha

来源：

Zhongguo Gonglu Xuebao/China Journal of Highway and Transport | 2020年 / 33卷 / 09期

基金：

中国国家自然科学基金;

关键词：

Freezing-thawing cycles; Nuclear magnetic resonance; Porous structure; Road engineering; Soil-freezing character curve; Unfrozen water content;

D O I：

10.19721/j.cnki.1001-7372.2020.09.012

中图分类号：

学科分类号：

摘要：

Soil-freezing characteristic curves (SFCC) are used for describing the relationship between negative temperature and the unfrozen water content. The SFCC and freezing-thawing cycle are essential factors in investigating unsaturated frozen soil. In this study, the tested soil materials were silt and clay, and the freezing-thawing cycle was determined using the low-field nuclear magnetic resonance technique, which can be used to plot the SFCC and examine the pore structure distribution of the soil. The results show that the pore distribution of soil changes with the increase in cycle time. The pore distribution of soil influences the hysteresis of SFCC and the change point of the characteristic temperature. Therefore, the change in the SFCC indicates variation in the pore structure. Based on the microstructure, the SFCC expression based on the pore structure was obtained. The SFCC of the melting process is the main freezing characteristic curve. Combined with a comparative analysis of experimental data, the proposed model conclusively shows the hysteretic effect of multiple freezing-thawing cycles. The model is suitable for analyzing unsaturated frozen soils under multiple cycles. © 2020, Editorial Department of China Journal of Highway and Transport. All right reserved.

引用

页码：115 / 125

页数：10

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