Study on the effects of temperature fluctuations in the seasonal frozen regions on the axial force and deformation of steel support structures in deep foundation pits

IF 4.9 2区工程技术 Q1 ENGINEERING, CIVIL

Cold Regions Science and Technology Pub Date : 2026-01-15 Epub Date: 2025-09-21 DOI:10.1016/j.coldregions.2025.104697

Yiru Hu, Xianzhang Ling

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引用次数: 0

Abstract

This study addresses the critical knowledge gap in understanding the complex mechanical behavior of steel support structures in deep foundation pits subjected to freeze-thaw cycles and temperature fluctuations in seasonal frozen regions, where existing design methods inadequately account for frost heave and thermal effects. Through comprehensive field monitoring and theoretical analysis of pile-anchor-steel support systems, this research reveals the significant temperature-induced effects on structural performance and develops innovative calculation methods for engineering applications. Systematic long-term monitoring demonstrates that steel support axial forces exhibit distinct three-stage evolution characteristics within the temperature range of −25.5 °C to 25.5 °C: an initial fluctuation stage with periodic minor responses, a rapid growth stage during frost heave intensification, and an attenuation-rebound stage during spring thawing. During the rapid growth stage, SSP1 increased from 249.62 kN to 335.56 kN, SSP2 from 275.09 kN to 549.56 kN, while SSP3 decreased from 931.1 kN to 874.69 kN, with the maximum sudden change amplitude reaching 39.47 % and other supports experiencing changes ranging from 10.62 % to 26.48 %. The spring thawing period resulted in maximum axial force attenuation amplitude of 98.73 %, indicating significant soil structure reconstruction effects. Based on five-element deformation coordination theory involving steel supports, support piles, soil behind piles, prestressed anchor cables, and waist beams, a novel stress analysis model considering frost heave and temperature effects was established using elastic resistance method. The model innovatively simplifies the complex multi-element system by representing soil behind piles, support piles, and prestressed anchor cables as three parallel springs. Comprehensive model validation against field measurements across two typical temperature variation periods shows theoretical calculations differ from measured values by only 2.84 %–18.84 % under various temperature conditions, demonstrating excellent computational accuracy and engineering applicability. The proposed simplified calculation method provides engineers with an effective tool for quantitative analysis of temperature stress in multiple steel supports, significantly improving design efficiency and safety. These research outcomes fill the theoretical gap in deep foundation pit support systems for cold regions and provide essential scientific foundation for technical specifications and safe underground space development in seasonal frozen regions.

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季节冻结区温度波动对深基坑钢支撑结构轴力和变形的影响研究

本研究解决了理解深基坑钢支撑结构在冻融循环和季节性冻区温度波动下复杂力学行为的关键知识差距，其中现有的设计方法不能充分考虑冻胀和热效应。本研究通过对桩-锚-钢支撑体系的全面现场监测和理论分析，揭示了温度对结构性能的显著影响，并为工程应用开发了创新的计算方法。系统的长期监测表明，在- 25.5℃~ 25.5℃温度范围内，钢支架轴向力表现出明显的三个阶段的演化特征：初始波动阶段，周期性小响应；霜胀加剧阶段，快速增长阶段；春融阶段，衰减-反弹阶段。在快速生长阶段，SSP1从249.62 kN增加到335.56 kN， SSP2从275.09 kN增加到549.56 kN， SSP3从931.1 kN减少到874.69 kN，最大突变幅度为39.47%，其他支架的变化幅度为10.62% ~ 26.48%。春融期轴力衰减幅度最大，达98.73%，表明土壤结构重构效果显著。基于钢支撑、支撑桩、桩后土、预应力锚索、腰梁五元变形协调理论，采用弹性阻力法建立了考虑冻胀和温度影响的应力分析模型。该模型创新性地将桩后土、支护桩和预应力锚索分别表示为三个平行的弹簧，简化了复杂的多单元系统。根据两个典型温度变化周期的现场实测数据对模型进行了综合验证，结果表明，在不同温度条件下，理论计算值与实测值的差异仅为2.84% ~ 18.84%，具有良好的计算精度和工程适用性。提出的简化计算方法为工程师定量分析多个钢支架的温度应力提供了有效工具，显著提高了设计效率和安全性。这些研究成果填补了寒冷地区深基坑支护系统的理论空白，为季节性冻结地区的技术规范和地下空间安全开发提供了必要的科学依据。

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.