压实雪的长期一维压缩试验和分数蠕变模型

IF 3.8 2区 工程技术 Q1 ENGINEERING, CIVIL Cold Regions Science and Technology Pub Date : 2024-09-21 DOI:10.1016/j.coldregions.2024.104326
Haifeng Huo , Qingwei Chen , Enzhao Xiao , Haichao Li , Hui Xu , Tao Li , Xueyuan Tang
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引用次数: 0

摘要

压实雪是极地地区的一种主要建筑材料,在加载过程中会发生持续变形,从而严重影响雪结构的安全性。本研究进行了一系列一维压缩试验,研究初始密度和应力水平对压实雪样 90 天内长期变形的影响。压实雪的压缩曲线可分为三个阶段:瞬时压缩、一次压缩和二次压缩。瞬时压缩发生在加压时;一次压缩发生在加载后 10 到 40 分钟内;二次压缩发生在雪在 90 天内保持不稳定时。二次压缩是样品长期变形的主要原因,二次压缩系数随着初始密度的增大和法向压力的降低而减小。建立了一个分数蠕变模型来描述实验数据,并获得了良好的一致性。所提出的模型采用分数偏差方法来修正经典的伯格斯模型,并利用实验数据校准了与密度相关的参数。经验证,所提出的模型是描述雪的蠕变行为的有用工具,研究结果有助于雪基上建筑结构的安全运行。
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Long-Term One-Dimensional Compression Tests and Fractional Creep Model of Compacted Snow
Compacted snow is a primary construction material in polar regions and experiences persistent deformation during loading, which considerably affects the safety of snow structures. This study conducts a series of one-dimensional compression tests to investigate the effect of initial densities and stress levels on the long-term deformation of compacted snow samples over 90 days. The compression curve of compacted snow can be divided into three stages: instantaneous, primary, and secondary compressions. Instantaneous compression occurs at pressurization; primary compression occurs within 10 to 40 min of loading; secondary compression occurs when snow remains unstable for 90 days. Secondary compression is the main cause of long-term deformation of the samples and the secondary compression coefficient tends to decrease with a higher initial density and lower normal pressure. A fractional creep model is developed to describe the experimental data and a good agreement was obtained. The proposed model adopts the fractional deviation approach to modify the classic Burgers model, and the density-dependent parameters are calibrated using the experimental data. The proposed model is verified as a useful tool in describing the creep behavior of snow, and the results of this study contribute to the safe operation of building structures on snow foundations.
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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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