Spatial-temporal evolution principle of temperature field in a high-temperature geothermal highway tunnel

Dao, Xu; Zhang, Bingwen; Ai, Zubin; Bu, Xiangbo; Pan, Haibo; Chen, Sijue

doi:10.1016/j.asej.2022.101965

Cited by 8 publications

(4 citation statements)

References 31 publications

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“…The change in temperature at the waist arch was slower than that of the top and bottom arches in the early part of the curve, and the same was true of the later part. The overall temperature of the three curves showed a rapid decrease with time, followed by a slow decrease, which was consistent with the numerical simulation results of Xu et al [22], indicating the feasibility of the model developed in this paper. At the completion of the tunnel excavation, the temperature of the top, bottom, and waist arches was around 79 • C. After 50 days of operating, the temperature dropped to 60 • C, which was 24% lower than when the excavation was completed.…”

Section: Analysis Of Temperature Transfer Between Envelope and Liningsupporting

confidence: 91%

Analysis of Structure Stability of Underwater Shield Tunnel under Different Temperatures Based on Finite Element Method

Zhu

Wu²,

Jiang

et al. 2023

Water

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The structural stability of the underwater shield tunnel during operations is affected by temperature variations. The effect of different structure temperatures on the underwater shield tunnel during the operation period was studied. By numerical simulation, the variation in the underwater shield tunnel temperature circle was analyzed. The variation patterns of the top arch, bottom arch, waist arch temperature, maximum principal stress, and settlement of the soil under different temperatures were obtained. The results showed that: (1) The early excavation time of the tunnel was short, and the temperature circle was small. The temperature circle expanded rapidly after 50 days of operating. The diffusion range increased from 1.5 m to 5.35 m: an increase of 256.7%. With the increase in time, the expansion rate of the temperature circle gradually slowed down. (2) The higher the temperature of the soil, the more complex the temperature transfer between the soil and the lining was while generating greater temperature stresses and reducing the safety of the tunnel. (3) When the tunnel was just excavated, the compression settlement of the top arch and the waist arch increased rapidly, reaching 5.43 mm and 0.24 mm, respectively. The bottom arch was squeezed by the soil on both sides, resulting in an uplift and rapid increase, reaching 4.94 mm. The settlement rate increased with the increase in the tunnel structure’s temperature. After the excavation, with the decrease in temperature, the strength of the soil and lining increased. The settlement of the top arch, bottom arch, and waist arch increased slowly with time, and the growth rate decreased gradually.

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Section: Analysis Of Temperature Transfer Between Envelope and Liningsupporting

confidence: 91%

Analysis of Structure Stability of Underwater Shield Tunnel under Different Temperatures Based on Finite Element Method

Zhu

Wu²,

Jiang

et al. 2023

Water

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“…When dealing with data obtained from experiments or numerical simulations, many researchers analyze correlations among the data through fitting. For instance, using a Yunnan roadway as a case study, Xu et al [19] observed that the temperature field of the roadway-surrounding rock with secondary lining exhibited a rapid increase, rapid decrease, stability, and slight decrease over time. In the spatial dimension, the temperature in the roadway follows an 'n' shape along the longitudinal direction, and the temperature profile of the surrounding rock is parabolic.…”

Section: Introductionmentioning

confidence: 99%

Dimensionless Analysis of the Spatial–Temporal Coupling Characteristics of the Surrounding Rock Temperature Field in High Geothermal Roadway Realized by Gauss–Newton Iteration Method

Zhou,

Zhang,

Shi

et al. 2024

Applied Sciences

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Understanding the time–space coupling characteristics of the surrounding rock temperature field in high geothermal roadways is essential for controlling heat damage in mines. However, current research primarily focuses on individually analyzing the temperature changes in the surrounding rock of roadways, either over time or space. Therefore, the Gauss–Newton iteration method is employed to model the coupling relationship between temperature, time, and space. The results demonstrate that the dual coupling function describing the temperature field of the surrounding rock in both time and space provides a more comprehensive characterization of the temperature variations. Over time, as ventilation duration increases, the fitting degree of the characteristic curve steadily rises, and the characteristic curve descends overall. In the spatial dimension, the fitting degree of the characteristic curve gradually decreases with the rise of the dimensionless radius, and the characteristic curve ascends overall. Additionally, as thermal conductivity increases, the fitting degree of the characteristic curve steadily rises.

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“…Zhou et al [27,28] derived the two-dimensional finite difference equation in tunnels on account of the theory of energy conservation and unsteady heat conduction, and provided the numerical solution for the temperature field in tunnels with elevated ground temperatures. Xu et al [29] studied the spatial-temporal evolution principle of the temperature field in a high-temperature geothermal highway tunnel. Alhawat et al [30] used the experimental method to study the thermal behavior of the tunnel lining under high temperatures.…”

Section: Introductionmentioning

confidence: 99%

A Theoretical Study on the Spatiotemporal Variation in the Temperature Field in Linings of High-Water-Temperature Tunnels

Huang,

et al. 2023

Materials

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On the basis of the theory of unsteady heat conduction, discrete equations for the unsteady temperature field in the secondary linings of high-water-temperature tunnels when considering the hydration heat of lining concrete were derived and established. Spatiotemporal variation in the temperature field of tunnel linings was revealed through the analysis of numerical examples. Research demonstrates that the temperature of the secondary lining within a thickness range of approximately 15 cm near the tunnel clearance decreases sharply under the condition that the lining thickness is 35 cm. The higher the temperature on the lining’s outer surface, the more drastically the lining temperature decreases. When considering the hydration heat of lining concrete, the lining temperature increases to a certain extent after a sudden drop, reaching stability after approximately 20 h, and the lining temperature is approximately 1–2 °C higher than that without taking concrete hydration heat into account. The temperature difference between the tunnel lining’s core and its inner and outer surfaces is positively and negatively correlated with the temperature of the secondary lining’s outer surface, respectively. When the temperature of the secondary lining’s outer surface is not higher than 65 °C, the temperature difference between the tunnel lining’s core and its inner and outer surfaces is less than 20 °C. Conversely, it partially or completely exceeds 20 °C, in which case an insulation method is recommended to utilize to prevent thermal cracks in secondary linings triggered via a high temperature difference.

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Spatial-temporal evolution principle of temperature field in a high-temperature geothermal highway tunnel

Cited by 8 publications

References 31 publications

Analysis of Structure Stability of Underwater Shield Tunnel under Different Temperatures Based on Finite Element Method

Analysis of Structure Stability of Underwater Shield Tunnel under Different Temperatures Based on Finite Element Method

Dimensionless Analysis of the Spatial–Temporal Coupling Characteristics of the Surrounding Rock Temperature Field in High Geothermal Roadway Realized by Gauss–Newton Iteration Method

A Theoretical Study on the Spatiotemporal Variation in the Temperature Field in Linings of High-Water-Temperature Tunnels

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