Distribution Law of the Initial Temperature Field in a Railway Tunnel with High Rock Temperature: A Model Test and Numerical Analysis

Sun, Shoubang; Yan, Songhong; Cao, Xiao‐Ping; Zhang, Wei

doi:10.3390/app13031638

Cited by 11 publications

(5 citation statements)

References 34 publications

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“…In the flow field, the flow of gas in the tunnel follows the law of mass conservation, and the expression is as follows [17]:…”

Section: Mass Conservation Equationmentioning

confidence: 99%

“…According to the field investigation results and indoor tests, the model physical and mechanical parameters are shown in Table 1. The monthly average temperature change from 2015 to 2016 is shown in Figure 3, and the fitting equation is Equation (17). In the course of the numerical analysis, the temperatures at the entrance and exit of the tunnel can be considered to be essentially consistent.…”

Section: Model Parameters and Boundary Conditionsmentioning

confidence: 99%

“…In the course of the numerical analysis, the temperatures at the entrance and exit of the tunnel can be considered to be essentially consistent. The expression is Equation (17).…”

Section: Model Parameters and Boundary Conditionsmentioning

confidence: 99%

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Distribution Pattern and Influencing Factors for the Temperature Field of a Topographic Bias Tunnel in Seasonally Frozen Regions

Tang¹,

Zhang

et al. 2023

Water

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In seasonally frozen regions, highway tunnels are prone to shallow buried bias pressures near the inlet/outlet, which leads to highway tunnels not only bearing asymmetric loads, but also facing the threat of extreme weather. However, there is still no clear understanding of the temperature field for topographically biased tunnel in seasonally frozen regions at present. Taking the Huitougou tunnel of Hegang-Dalian expressway as the object, this paper uses on-site monitoring, theoretical analysis, and numerical simulation to study the distribution law and influence factors of temperature field for topographically biased tunnel in seasonally frozen regions. The numerical results of the temperature field are in good agreement with the on-site monitoring data, which verified the accuracy of this numerical model based on the aerodynamic principle, turbulence model, and wall function method. Meanwhile, the effect of different slope angle and overburden thickness on the temperature field of the tunnel is further analyzed. It is found that when the slope angle increases, the temperature field in the tunnel surrounding rock changes accordingly. The connecting area between the surface and the tunnel temperature field is deflected from arch crown to the arch shoulder of the tunnel, resulting in a large change in the temperature of the shallow buried side, while minor change in the temperature of the deep buried side. The freezing depth of surrounding rock decreases with the rising slope angle. As the overburden thickness gradually increases, the temperature field of the surface surrounding rock and the tunnel surrounding rock gradually change from mutual influence to non-influence. When the overburden thickness exceeds 15 m, a “isolated temperature zone” appears in the middle with a temperature of 6~7 °C, the temperature field of the tunnel surrounding rock is basically not affected by the surface air temperature. These results can provide important theoretical and engineering guidance for the evaluation, construction, and maintenance of tunnel engineering in seasonally frozen regions.

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“…In the flow field, the flow of gas in the tunnel follows the law of mass conservation, and the expression is as follows [17]:…”

Section: Mass Conservation Equationmentioning

confidence: 99%

Section: Model Parameters and Boundary Conditionsmentioning

confidence: 99%

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Distribution Pattern and Influencing Factors for the Temperature Field of a Topographic Bias Tunnel in Seasonally Frozen Regions

Tang¹,

Zhang

et al. 2023

Water

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“…The effect of high temperatures from fires on tunnel structures has also been studied by many scholars [17][18][19]. The flow route of the fire-induced high-temperature airflow through the tunnel was proposed [20,21]. However, numerical simulation studies on the effects of high temperatures on underwater shield tunnel structures during operation are scarce.…”

Section: Introductionmentioning

confidence: 99%

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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“…The main factors affecting the heat loss of roadways are convective temperature difference, air volume, roadway length, and altitude. Sun et al (Sun, Yan, Cao, & Zhang, 2023) established a model test system to study high-temperature tunnels' initial temperature field distribution. The experimental results show that the temperature at the entrance and end of the roadway is low, and the middle temperature is high.…”

mentioning

confidence: 99%

Numerical Simulation of Fluid-Solid Coupling Heat Transfer in Excavating Roadway

Jiale,

Yuan

2023

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Heat damage is an urgent problem to be solved in deep mining. The relevant factors in the excavation roadway significantly affect the cooling effect in the roadway. In this paper, the fluid-solid coupling heat transfer model of excavating roadway is established using numerical simulation, and the influence of inlet air temperature, wind speed, original rock temperature and surrounding rock thermal conductivity on roadway temperature is studied. The results show that the larger the initial rock temperature, the higher the airflow temperature in the roadway, and the greater the decrease of the airflow temperature after ventilation. The lower the inlet air temperature, the more significant the decrease in the airflow temperature in the roadway after ventilation, and the airflow temperature in the roadway gradually stabilizes with the extension of the ventilation time. The greater the wind speed, the lower the airflow temperature in the roadway, and the more significant the decrease of the airflow temperature in the roadway after ventilation. When the wind speed reaches a specific value, the cooling effect of ventilation is minimal. The higher the thermal conductivity of the surrounding rock, the higher the outlet temperature simultaneously.

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Distribution Law of the Initial Temperature Field in a Railway Tunnel with High Rock Temperature: A Model Test and Numerical Analysis

Cited by 11 publications

References 34 publications

Distribution Pattern and Influencing Factors for the Temperature Field of a Topographic Bias Tunnel in Seasonally Frozen Regions

Distribution Pattern and Influencing Factors for the Temperature Field of a Topographic Bias Tunnel in Seasonally Frozen Regions

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

Numerical Simulation of Fluid-Solid Coupling Heat Transfer in Excavating Roadway

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