An Analytical Solution of Frost Heaving Pressure for Cold-region Tunnel Considering Freeze-thaw Cycles and in-situ Stress

IF 1 Q4 ENGINEERING, CIVIL
Wang-Tao Jiang
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引用次数: 0

Abstract

The damage caused by the frost heaving pressure on the surrounding rocks and lining structure of cold-region tunnels is always common, which can seriously threaten the safety and stability for cold-region tunnels. Although many achievements of frost heave pressure model have been obtained, two factors have been often ignored, which are in-situ stress and freeze-thaw cycles. Therefore, the calculation mechanical model of coldregion tunnels is established and the expression of frost heaving pressure considering frost heaving effect and in-situ stress is derived based on the elastic theory. The relationship between the elastic modulus of surrounding rocks and the number of freeze-thaw cycles was fitted by experimental data and the calculation formula of frost heaving rate of rocks considering their porosity change caused by freeze-thaw cycles is derived. Based on that, the calculation method of frost heaving pressure considering in-situ stress and freeze-thaw cycles is proposed. The example analysis results show that frost heaving ratio and frost heaving pressure gradually increase with freeze-thaw cycles, which are eventually subjected to a steady value. Simultaneously, the frost heaving pressure acting on lining increases with in-situ stress for tunnels in cold regions and some effective insulation measures should be applied to prevent frost damage. KEYWORDS: Frost heaving pressure, Cold-region tunnels, Freeze-thaw cycles, Analytical solution, Zero-frost heave displacemen
考虑冻融循环和地应力的寒区隧道冻胀压力解析解
冻胀压力对寒区隧道围岩和衬砌结构造成的破坏十分普遍,严重威胁着寒区隧道的安全稳定。尽管冻胀压力模型已经取得了许多成果,但往往忽略了地应力和冻融循环两个因素。为此,建立了冷区隧道的计算力学模型,并基于弹性理论推导了考虑冻胀效应和地应力的冻胀压力表达式。通过实验数据拟合了围岩弹性模量与冻融循环次数之间的关系,推导了考虑冻融循环引起的岩石孔隙率变化的冻胀率计算公式。在此基础上,提出了考虑地应力和冻融循环的冻胀压力计算方法。算例分析结果表明,随着冻融循环次数的增加,冻胀率和冻胀压力逐渐增大,最终趋于稳定。同时,寒冷地区隧道衬砌上的冻胀压力随着地应力的增大而增大,应采取有效的保温措施防止冻损。关键词:冻胀压力,寒区隧道,冻融循环,解析解,零冻胀位移
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
CiteScore
2.10
自引率
27.30%
发文量
0
期刊介绍: I am very pleased and honored to be appointed as an Editor-in-Chief of the Jordan Journal of Civil Engineering which enjoys an excellent reputation, both locally and internationally. Since development is the essence of life, I hope to continue developing this distinguished Journal, building on the effort of all the Editors-in-Chief and Editorial Board Members as well as Advisory Boards of the Journal since its establishment about a decade ago. I will do my best to focus on publishing high quality diverse articles and move forward in the indexing issue of the Journal.
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