Unsteady heat-moisture transfer of wet airway in deep mining

Wang, Yijiang; Zhou, Guoqing; Wu, Lei

doi:10.1007/s11771-013-1697-2

Cited by 14 publications

(9 citation statements)

References 10 publications

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“…In order to describe the temperature field of the underground tunnel, some theoretical studies [4][5][6], experimental [7,8] and numerical methods [9,10] have been conducted. The research by Bharadwaj showed that shallow-buried and deep-buried tunnels would have different temperature environments [11].…”

Section: Introductionmentioning

confidence: 99%

Field measurements and parametric studies for the thermal environment of underground tunnel entrance in cold climate zones

et al. 2022

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In frozen regions, especially metro tunnel portal sections, which are vulnerable to an externally low-temperature atmosphere, would lead to frozen damage affecting traffic safety. To clarify how the air temperature field at tunnel portal sections varies with periodically changing atmospheric temperature, a site test was conducted on Metro Line 1 in Hohhot in the Inner Mongolia Autonomous Region, and the basic heat transfer equation and principle of energy conservation were introduced to establish a basic theoretical model, which was compared with the results from other regions. By comparison with testing results in other regions, the theoretical model was essentially consistent with the variation rules of the tested temperature. Therefore, the research could theoretically direct the heat preservation and freeze prevention of key facilities and equipment in metro tunnel portal sections in frozen regions.

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Section: Introductionmentioning

confidence: 99%

Field measurements and parametric studies for the thermal environment of underground tunnel entrance in cold climate zones

et al. 2022

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“…It was reported that the air temperature in the Anglogold mine in South Africa was higher than 55 °C with the mining depth exceeding 3800 m. In China, there were more than 74 coal mines with mining depth exceeding 900 m in 2015, and the original rock temperature ranges between 35-45 °C. Recently, an increasing number of coal and metal mines are facing the engineering challenge caused by hot and humid mining environment, which imposes a negative impact on miners' health, mining facilities and productivity [2]. It is imperative for deep mines to provide a suitable working environment through cost effective cooling measures.…”

Section: Introductionmentioning

confidence: 99%

The impact of thermal insulation on cooling energy consumption and optimal insulation thickness for underground tunnel

Wang

Gao

et al. 2021

Sustainable Energy Technologies and Assessments

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“…Such damage is effectively prevented by installing TIL on the tunnel wall, which decreases the heat flux between tunnel rock and airflow due to low thermal conductivity [8,18]. Numerous studies have focused on the temperature variation before and after TIL installation by analytical [6,19], numerical [7,20], and experimental methods [21]. They found that the heat exchange is intense at the tunnel entrance and becomes weak with the increased ventilation distance, resulting in the freeze-thaw damage always appearing near the tunnel entrance [22].…”

Section: Introductionmentioning

confidence: 99%

“…Sci. 2021, 11, x FOR PEER REVIEW 2 of 19 [7,20], and experimental methods [21]. They found that the heat exchange is intense at the tunnel entrance and becomes weak with the increased ventilation distance, resulting in the freeze-thaw damage always appearing near the tunnel entrance [22].…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Thermal Damage Behavior and Heat Insulation Protection in a High-Temperature Tunnel

Kang

Tang

et al. 2021

Applied Sciences

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Deepening our understanding of temperature and stress evolution in high-temperature tunnels is indispensable for tunnel support and associated disaster prevention as the rock temperature is remarkably high in hot dry rock (HDR) utilization and similar tunnel engineering. In this paper, we established a two-dimensional thermal–mechanical coupling model through RFPA2D-thermal, by which the temperature and stress field of the surrounding rock in a high-temperature tunnel with and without thermal insulation layer (TIL) were studied, followed by the evolution of thermal cracks. The associated sensitivity analysis of the TIL and airflow factors were then carried out. We found that (1) the tunnel rock is unevenly cooled down by the cold airflow, which induces thermal stress and damages the rock element when it exceeds the tensile strength of the rock mass. Those damaged rock elements accumulate and coalesce into visible cracks in the tunnel rock as the ventilation time goes, reducing the tunnel stability. (2) TIL effectively reduces the heat exchange between the airflow and tunnel rock and weakens the cold shock by the airflow, delaying the crack initiation which provides efficient time to adopt engineering measures for tunnel supporting. (3) TIL parameters are of pivotal importance to the long-term cold shock by the airflow. Increasing the TIL thickness and reducing the TIL thermal conductivity both significantly enhance the thermal insulation effect. The results cover the gap in the study of cold shock in high-temperature tunnels, which is helpful in designs to prevent thermal damage in high-temperature tunnels.

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Unsteady heat-moisture transfer of wet airway in deep mining

Cited by 14 publications

References 10 publications

Field measurements and parametric studies for the thermal environment of underground tunnel entrance in cold climate zones

Field measurements and parametric studies for the thermal environment of underground tunnel entrance in cold climate zones

The impact of thermal insulation on cooling energy consumption and optimal insulation thickness for underground tunnel

Numerical Study on Thermal Damage Behavior and Heat Insulation Protection in a High-Temperature Tunnel

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