Study on strain localization of frozen sand based on uniaxial compression test and discrete element simulation

IF 3.8 2区工程技术 Q1 ENGINEERING, CIVIL Cold Regions Science and Technology Pub Date : 2024-04-30 DOI:10.1016/j.coldregions.2024.104221

Dongyong Wang, Bo Shao, Jilin Qi, Wenyu Cui, Shengbin Jiang, Liyun Peng

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Abstract

Strain localization has always been an important subject in frozen soil mechanics and engineering. To evaluate the development of local strain and the formation of shear bands in frozen soil, uniaxial compression tests have been conducted on frozen sand at various temperatures and particle grades. The strain localization evolution law of the frozen soil is analyzed utilizing the digital image correlation (DIC) method. The test results reveal that the entire process of shear band generation, development, and formation in frozen soil can be well captured. Within the testing temperature and particle grade range in this study, in comparison to particle grade, temperature exerts a more pronounced influence on the shear band angle which increases as temperature decreases. It is discovered that the width of the shear band increases with the decrease in temperature and the increase in mean particle diameter d₅₀. Subsequently, a discrete element method (DEM) model is developed to examine the microscopic mechanical characteristics of frozen sand in uniaxial compression tests. The reliability of the DEM model is verified through comparative analysis with test results. Besides, the development law of the strain localization of the frozen soil obtained by the numerical simulation is revealed based on the quantitative analysis of the rotational angle, bonding state, and displacement of the soil particle during the shearing process.

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基于单轴压缩试验和离散元模拟的冻砂应变定位研究

应变局部化一直是冻土力学和工程学的一个重要课题。为了评估冻土中局部应变的发展和剪切带的形成，对不同温度和颗粒等级的冻砂进行了单轴压缩试验。利用数字图像相关（DIC）方法分析了冻土的应变局部演变规律。试验结果表明，可以很好地捕捉到冻土中剪切带产生、发展和形成的全过程。在本研究的测试温度和颗粒等级范围内，与颗粒等级相比，温度对剪切带角度的影响更为明显，温度越低，剪切带角度越大。研究发现，剪切带的宽度随着温度的降低和平均颗粒直径 d50 的增加而增加。随后，建立了离散元素法（DEM）模型，以研究单轴压缩试验中冻砂的微观力学特性。通过与试验结果的对比分析，验证了 DEM 模型的可靠性。此外，基于对剪切过程中土粒的旋转角、粘结状态和位移的定量分析，揭示了数值模拟得到的冻土应变局部化发展规律。

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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.