Experimental investigations of the shear strength and deformation behavior of a frozen unsaturated silt

IF 3.8 2区工程技术 Q1 ENGINEERING, CIVIL

Cold Regions Science and Technology Pub Date : 2024-09-24 DOI:10.1016/j.coldregions.2024.104332

Hao Wang , Xu Li , Wenhao Huang , Sai K. Vanapalli

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引用次数: 0

Abstract

There are limited studies in literature with respect to the deformation and shear strength behavior of frozen unsaturated soils that consider sensitive changes in temperatures below 0 °C. For this reason, the focus of the present study is directed towards investigating the shear strength and deformation behavior of a frozen unsaturated silt. As a part of the study, one-dimensional freezing tests were performed on compacted silt samples with various initial water contents and dry densities. The pulsed nuclear magnetic resonance (P-NMR) method was used to obtain distribution of unfrozen water content of silt samples; this information was used to explain the deformation behavior during freezing. The volume change behavior in unsaturated soils due to freezing can be associated to three primary factors: expansion caused by the ice-water phase transition and shrinkage induced by ice-cementation and dehydration. A critical water saturation was also observed at which the frost heave is minimum, or no volume change occurs. In addition, conventional direct shear tests were performed on compacted unsaturated silt samples both in frozen and unfrozen conditions to determine and quantify the shear strength contribution arising from the different cohesion components. The investigations in this study provide valuable information that can be used in rational explanation of the strength and deformation behavior of unsaturated frozen soils.

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冰冻非饱和淤泥的剪切强度和变形行为实验研究

关于冻结非饱和土壤的变形和剪切强度行为，考虑到 0 °C 以下温度的敏感变化的文献研究非常有限。因此，本研究的重点是调查冻结非饱和淤泥的剪切强度和变形行为。作为研究的一部分，对具有不同初始含水量和干密度的压实淤泥样本进行了一维冻结试验。利用脉冲核磁共振（P-NMR）方法获得了淤泥样品未冻结含水量的分布情况；这一信息被用来解释冻结过程中的变形行为。非饱和土壤在冻结过程中的体积变化行为主要与三个因素有关：冰-水相变引起的膨胀以及冰凝结和脱水引起的收缩。此外，还观察到一个临界水饱和度，在这个临界点上，冻胀最小或不发生体积变化。此外，还在冰冻和非冰冻条件下对压实的非饱和淤泥样本进行了传统的直接剪切试验，以确定和量化不同内聚力成分对剪切强度的贡献。这项研究提供了宝贵的信息，可用于合理解释非饱和冻土的强度和变形行为。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Cold Regions Science and Technology 工程技术-地球科学综合

CiteScore

7.40

自引率

12.20%

发文量

209

审稿时长

4.9 months

期刊介绍： Cold Regions Science and Technology is an international journal dealing with the science and technical problems of cold environments in both the polar regions and more temperate locations. It includes fundamental aspects of cryospheric sciences which have applications for cold regions problems as well as engineering topics which relate to the cryosphere. Emphasis is given to applied science with broad coverage of the physical and mechanical aspects of ice (including glaciers and sea ice), snow and snow avalanches, ice-water systems, ice-bonded soils and permafrost. Relevant aspects of Earth science, materials science, offshore and river ice engineering are also of primary interest. These include icing of ships and structures as well as trafficability in cold environments. Technological advances for cold regions in research, development, and engineering practice are relevant to the journal. Theoretical papers must include a detailed discussion of the potential application of the theory to address cold regions problems. The journal serves a wide range of specialists, providing a medium for interdisciplinary communication and a convenient source of reference.