冰骨架对单轴压缩下冻土力学行为的影响

IF 3.8 2区 工程技术 Q1 ENGINEERING, CIVIL Cold Regions Science and Technology Pub Date : 2024-09-23 DOI:10.1016/j.coldregions.2024.104327
Hao Zheng , Ningyu Yang , Junling Si , Chongqian Ma , Shunji Kanie
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引用次数: 0

摘要

冻土中多层水平冰透镜的形成会显著改变其内部结构,从而导致其力学性能发生变化。为了定量分析多层冰透镜对力学性能的影响,研究人员对易受冻的粘土材料进行了一系列不同冻结比的冻结试验。然后,进行了单轴压缩试验,以研究冻土在不同冻结比和温度下的变形和强度特性。实验结果表明,由水平冰透镜和倾斜冰楔形成的独特冰骨架结构能显著提高样品的强度,导致峰值应力和秒模量 E50 随冻结比的增加而增加,而且冰骨架的存在使强度对温度变化更加敏感。冻土样品表现出两种破坏模式(隆起破坏和剪切破坏),对土体的力学参数有很大影响。根据测试结果,在应变软化模型中引入了冻胀诱发的破坏系数,以考虑冰骨架生长过程中产生的微裂缝导致的初始刚度降低。这一修改后的模型可有效预测不同冰骨架结构土壤的应力-应变关系。这些发现对于预测使用人工冻结方法建造的冻土的性质具有实际意义。
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Influence of ice skeleton on the mechanical behavior of frozen soil under uniaxial compression
The formation of multi-layer horizontal ice lenses in frozen soil significantly alters its internal structure, leading to changes in its mechanical properties. To quantitatively analyze the effects of multi-layer ice lenses on mechanical properties, a series of freezing tests were conducted with frost-susceptible clay materials at varied freezing ratios. Then, the uniaxial compression tests were conducted to investigate the deformation and strength properties of frozen soil at different freezing ratios and temperatures. The experimental results indicate that the unique ice skeleton structure formed by horizontal ice lenses and inclined ice wedges can significantly improve the strength of the samples, leading to the peak stress and secant modulus E50 increase with the freezing ratio, and the presence of an ice skeleton makes the strength more sensitive to temperature changes. The frozen soil samples exhibit two failure modes (bulging failure and shearing failure), which significantly affect the mechanical parameters of the soil. Based on the test results, a frost heave-induced damage coefficient is introduced into the strain softening model to account for the initial stiffness reduction caused by microcracks generated during the ice skeleton growth. This modified model effectively predicts the stress-strain relationship of soils with varying ice skeleton structures. These findings have practical implications for predicting the properties of frozen soil constructed using artificial freezing methods.
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来源期刊
Cold Regions Science and Technology
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.
期刊最新文献
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