Experimental study on dynamic elastic modulus of thawing subgrade sandy loam soil under vibration load

IF 3.8 2区工程技术 Q1 ENGINEERING, CIVIL

Cold Regions Science and Technology Pub Date : 2025-09-13 DOI:10.1016/j.coldregions.2025.104688

Wenshao Xin , A.V. Petriaev , Jiankun Liu , Maria Chetina

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引用次数: 0

Abstract

Railway construction in the Arctic sandy loam region of the Russian Federation is developing continuously. Due to global warming, permafrost degradation is inevitable. Thawing of permafrost will inevitably reduce the deformation resistance of the subgrade, affecting the safety of railway operation. The soil's dynamic elastic modulus (E_d) is the most important factor in studying the dynamic response of subgrade under train loads. Based on dynamic triaxial tests, the research deals with the change regularities in the E_d of thawing sandy loam soils under different conditions of temperature, water content, confining pressure and loading frequency. The regression function of the thawing sandy loam soil E_d under various single factors was constructed. Based on the correlation assessing rule, a multivariate linear regression function between thawing sandy loam soil E_d and multiple factors was established. The prediction error of this function ranges from −8.33 % to 7.14 %. The results show that water content has the greatest influence on the E_d of thawing sandy loam soil, and its influence weight coefficient is 51.07 %, followed by loading frequency, temperature and confining pressure. Based on Pearson correlation coefficient and Spearman rank correlation coefficient, it can be seen that temperature and water content are negatively correlated with the E_d, while confining pressure and loading frequency are positively correlated with the E_d. In general, the proposed prediction model can effectively solve the non-linear problem between the E_d of thawing sandy loam soil and the influencing factors, thus providing valuable support material for studying dynamic response of subgrades operating in permafrost areas during thawing period.

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振动荷载作用下融化路基砂壤土动弹性模量试验研究

俄罗斯联邦北极沙壤土地区的铁路建设正在不断发展。由于全球变暖，永久冻土退化是不可避免的。多年冻土的融化必然会降低路基的抗变形能力，影响铁路运营的安全。土体动弹性模量（Ed）是研究列车荷载作用下路基动力响应的重要因素。通过动三轴试验，研究了不同温度、含水量、围压和加载频率条件下融化砂壤土Ed的变化规律。构建了不同单因素作用下的融化砂壤土Ed的回归函数。基于相关评价规则，建立了融砂壤土Ed与多因素之间的多元线性回归函数。该函数的预测误差范围为−8.33% ~ 7.14%。结果表明：含水量对融化砂壤土Ed的影响最大，其影响权重系数为51.07%，其次是加载频率、温度和围压；从Pearson相关系数和Spearman秩相关系数可以看出，温度和含水量与Ed呈负相关，围压和加载频率与Ed呈正相关。总的来说，所建立的预测模型可以有效地解决融化砂壤土Ed与影响因素之间的非线性问题。为研究多年冻土区路基在解冻期的动力响应提供了有价值的支撑材料。

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.