A practical method for determining the elastic modulus of frozen soils

IF 3.8 2区工程技术 Q1 ENGINEERING, CIVIL

Cold Regions Science and Technology Pub Date : 2025-06-20 DOI:10.1016/j.coldregions.2025.104588

Xiangtian Xu , Ruiqiang Bai , Guofang Xu , Shengnan Chen , Bujin Zhang

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引用次数: 0

Abstract

Elastic modulus of frozen soil is an important mechanical parameter for the design and construction of buildings and infrastructures in seasonal frozen soil and permafrost regions. To explore a reasonable approach for determining the elastic modulus of frozen soil, this study selects frozen silty sand, frozen silty clay, and frozen loess as representatives, and investigates the variations of 10 deformation moduli with confining pressure. The moduli are the initial tangent modulus (E_0qf), secant moduli (E_0.2qf - E_0.5qf) measured up to 20 %, 30 %, 40 %, 50 % of failure stress, and secant moduli (E_0.1εf - E_0.5εf) measured up to 10 %, 20 %, 30 %, 40 %, 50 % of failure strain. A linear model is proposed to describe the moduli variations with confining pressure, and the performance of the model is evaluated based on 12 indicators. The results show that the change of each modulus with confining pressure is influenced by the yielding mode of the test specimen. The moduli decrease with increasing confining pressure when the specimen yields in a shear mode, and increase with the confining pressure further increase once the specimen yields in compressibility mode. Under the same yielding mode, there exist linear relationships between the deformation moduli and confining pressure. It is interesting to find that the relationship between E_0qf - E_0.5qf and confining pressure is affected by soil type, while the linear relationship between E_0.1εf - E_0.5εf and confining pressure is independent of the soil type tested. Moreover, the linear relationships between E_0.1εf - E_0.5εf and confining pressure are more significant than those between E_0qf - E_0.5qf and confining pressure. Using E_0.2εf - E_0.5εf as the elastic modulus can effectively reduce the discreteness of the index, thus reduce the quantity of the experiments for determining the elastic modulus, and facilitate to determine more realistic frozen soil deformation in engineering calculation. From this point of view, this study provides a practical method for determining the elastic modulus of frozen soils.

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测定冻土弹性模量的实用方法

冻土弹性模量是季节性冻土区和多年冻土区建筑物和基础设施设计和施工的重要力学参数。为探索确定冻土弹性模量的合理方法，本研究选取冻结粉质砂、冻结粉质粘土和冻结黄土为代表，研究了10个变形模量随围压的变化规律。模量为初始切模量（E0qf），测得破坏应力的20%、30%、40%、50%的切模量（E0.2qf - E0.5qf），测得破坏应变的10%、20%、30%、40%、50%的切模量（E0.1εf - E0.5εf）。提出了一个描述模量随围压变化的线性模型，并基于12个指标对模型的性能进行了评价。结果表明：各模量随围压的变化受试件屈服方式的影响；剪切屈服模量随围压的增大而减小，压缩屈服模量随围压的增大而增大。在相同屈服模态下，变形模量与围压之间存在线性关系。有趣的是，E0qf - E0.5qf与围压的关系受土型的影响，而E0.1εf - E0.5εf与围压的线性关系与试验土型无关。且E0.1εf ~ E0.5εf与围压的线性关系比E0qf ~ E0.5qf与围压的线性关系更为显著。采用E0.2εf - E0.5εf作为弹性模量，可以有效降低指标的离散性，从而减少测定弹性模量的实验量，便于在工程计算中确定更真实的冻土变形。由此，本研究为冻土弹性模量的测定提供了一种实用的方法。

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.