The influence of thermophysical properties of frozen soil on the temperature of the cast-in-place concrete pile in a negative temperature environment

IF 0.8 Q4 THERMODYNAMICS

Archives of Thermodynamics Pub Date : 2023-08-02 DOI:10.24425/ather.2023.146557

Ziying Liu, Tianlai Yu, Ning Yan, Lipeng Gu

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Abstract

Thermophysical properties of frozen soil have a great inﬂu-ence on the quality of cast-in-place concrete piles. In this paper, the embedded concrete temperature monitoring system is used to test the variation law of the concrete temperature during the construction of the bored pile. Thermophysical properties of permafrost around piles are tested. Based on the theory of three-phase unsteady heat conduction of soil, the inﬂuence of speciﬁc heat capacity, thermal conductivity, thermal diﬀusivity, and latent heat of phase transformation on the temperature change of a concrete pile is systematically studied. The thermal parameter is obtained which exerts the most signiﬁcant inﬂuence on the temperature ﬁeld. According to the inﬂuence degree of frozen soil on pile temperature, the order from high to low is thermal conductivity, thermal diﬀusivity, latent heat of phase change, and speciﬁc heat capacity. The changes in pile wall temperature caused by the change of these properties range between 2.60–10.97 ◦ C, 1.49– 9.39 ◦ C, 2.16–2.36 ◦ C, and 0.24–3.45 ◦ C, respectively. The change percentages of parameters vary between 35.77–47.12%, 12.22–40.20%, 12.46–32.25%, and 3.83–20.31%, respectively. Therefore, when designing and constructing concrete foundation piles, the inﬂuence of the thermal conductivity of frozen

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负温度环境下冻土热物性对现浇混凝土桩温度的影响

冻土的热物理性质对现浇混凝土桩的质量有很大影响。本文采用嵌入式混凝土温度监测系统对钻孔灌注桩施工过程中混凝土温度的变化规律进行了测试。测试了桩周冻土的热物理性质。基于土壤三相非稳态导热理论，系统地研究了特定热容、导热系数、温差和相变潜热对混凝土桩温度变化的影响。获得对温度场影响最大的热参数。根据冻土对桩温的影响程度，从高到低依次为热导率、温差、相变潜热和特定热容。这些特性的变化引起的桩壁温度变化范围在2.60–10.97之间◦ C、 1.49–9.39◦ C、 2.16–2.36◦ C、和0.24–3.45◦ C、分别。参数的变化百分比分别在35.77–47.12%、12.22–40.20%、12.46–32.25%和3.83–20.31%之间。因此，在设计和施工混凝土基桩时，冻结的导热系数的影响

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来源期刊

Archives of Thermodynamics THERMODYNAMICS-

CiteScore

1.80

自引率

22.20%

发文量

期刊介绍： The aim of the Archives of Thermodynamics is to disseminate knowledge between scientists and engineers interested in thermodynamics and heat transfer and to provide a forum for original research conducted in Central and Eastern Europe, as well as all over the world. The journal encompass all aspect of the field, ranging from classical thermodynamics, through conduction heat transfer to thermodynamic aspects of multiphase flow. Both theoretical and applied contributions are welcome. Only original papers written in English are consider for publication.