Multiscale mechanical analysis of Frozen Clay: Triaxial testing and discrete element modeling

IF 3.8 2区 工程技术 Q1 ENGINEERING, CIVIL Cold Regions Science and Technology Pub Date : 2024-06-13 DOI:10.1016/j.coldregions.2024.104250
Yihui Yan , Dan Chang , Jiankun Liu , Anhua Xu , Lizhen Feng
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Abstract

The macroscopic and microscopic mechanical characteristics of subgrade soil in cold regions play an important role in the stability of embankment engineering in cold regions. In this study, we conduct triaxial tests and isotropic loading-unloading tests on frozen clay in the cold region subgrade. The tests are conducted under different temperatures and confining pressures to obtain its macroscopic strength and deformation characteristics. Meanwhile, we establish a discrete element model of frozen clay based on the Discrete Element Method (DEM) to simulate conventional triaxial and isotropic loading-unloading tests, and analyze its mechanical characteristics from a microscopic perspective. The results of the study indicate that the strength and deformation of frozen clay are greatly affected by the cooling temperature and confining pressure. As the cooling temperature decreases, the cohesion of the specimen significantly increases, and the internal friction angle slightly increases, along with the elastic moduli. Under low confining pressure, the specimen exhibits significant volumetric expansion, while under high confining pressure, the specimen mainly undergoes volumetric contraction. Through discrete element numerical simulation, we obtain the microscopic mechanical characteristics of frozen clay, explain the “bulging” phenomenon of the specimen from a microscopic perspective, and verify the applicability of the flexible membrane. Meanwhile, the influence rules of various microscopic parameters on the mechanical properties of frozen clay are also obtained through a series of parameter calibration works.

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冻土的多尺度力学分析:三轴测试和离散元素建模
寒冷地区路基土的宏观和微观力学特性对寒冷地区路堤工程的稳定性起着重要作用。本研究对寒区路基冻土进行了三轴试验和各向同性加载-卸载试验。试验在不同温度和约束压力下进行,以获得其宏观强度和变形特性。同时,基于离散元法(DEM)建立冻土离散元模型,模拟常规三轴和各向同性加载-卸载试验,从微观角度分析其力学特性。研究结果表明,冻土的强度和变形受冷却温度和约束压力的影响很大。随着冷却温度的降低,试样的内聚力显著增加,内摩擦角略有增大,弹性模量也随之增大。在低约束压力下,试样表现出明显的体积膨胀,而在高约束压力下,试样主要发生体积收缩。通过离散元数值模拟,我们获得了冻土的微观力学特性,从微观角度解释了试样的 "鼓胀 "现象,验证了柔性膜的适用性。同时,通过一系列的参数标定工作,还得到了各种微观参数对冻土力学性能的影响规律。
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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.
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