Simulation Study on the Influence Factors of Thermal Characteristics of Surrounding Rocks in Subway Tunnels
The air temperature in a subway tunnel is influenced by the surrounding rocks. The temperature distribution in the surrounding rock is affected by many factors. To obtain the evolution trend of the heat transfer and thermal reservoir of the surrounding rocks, we need to understand the influence of v...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Journal of Refrigeration Magazines Agency Co., Ltd.
2019-01-01
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| Series: | Zhileng xuebao |
| Subjects: | |
| Online Access: | http://www.zhilengxuebao.com/thesisDetails#10.3969/j.issn.0253-4339.2019.04.135 |
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| Summary: | The air temperature in a subway tunnel is influenced by the surrounding rocks. The temperature distribution in the surrounding rock is affected by many factors. To obtain the evolution trend of the heat transfer and thermal reservoir of the surrounding rocks, we need to understand the influence of various factors on the heat transfer. In this study, the CHAMPS-BES software is used to simulate the effect of the soil property and air temperature on the heat transfer in the surrounding rocks and the significant degree of influence of various factors on the temperature distribution characteristics in the surrounding rocks using an orthogonal experimental method. We find that the influence of the soil thermal diffusivity on the peak position of the surrounding rocks is very significant. When the soil thermal diffusivity is 7.6 × 10-7 m2/℃, the heat transfer is faster, and the thickness of the heat sink for 20 years exceeds the range of 50 m. On the basis of this research, the study on the characteristics of heat storage and change of the heat storage in the surrounding rocks in different regions reveals that the soil in north area has lower initial temperature, and the annual net heat storage of the soil is greater. In the Harbin area, the annual net heat storage of the soil is approximately 102300 MJ, which is equivalent to 1.8% of the train heat dissipation. However, the annual net heat capacity of the soil gradually decreases with the increase in the operation years. |
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| ISSN: | 0253-4339 |