The coupling effect of ventilation and groundwater flow on the thermal performance of tunnel lining GHEs

Zhang, Guozhu; Liu, Songyu; Zhao, Xu; Ye, Meixi; Chen, Runfa; Zhang, Hualin; Yang, Junda; Chen, Jiawei

doi:10.1016/j.applthermaleng.2016.10.120

Cited by 42 publications

(24 citation statements)

References 48 publications

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“…Again, the structure internal boundary condition is very important. Zhang et al (2014) have observed the importance of the air inside the tunnel as a heat source, with subsequent analysis linking tunnel air speed and heat transfer rates (Zhang et al 2016a(Zhang et al , 2017. This is reflected in the study of Nicholson et al 2014awhere the trains running within the tunnel were positively taken as a source of heat.…”

Section: Numerical Simulationsmentioning

confidence: 98%

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Energy geostructures: A review of analysis approaches, in situ testing and model scale experiments

Loveridge

McCartney

Narsilio

et al. 2020

Geomechanics for Energy and the Environment

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TThis position paper was developed by members of the task force on "Energy Geostructures" of the International Society of Soil Mechanics and Geotechnical Engineering (ISSMGE) Technical Committee TC308 on 'Energy Geotechnics'. The article includes a summary and review of some of the most recent analysis approaches, in situ testing, full scale testing and model scale experiments with a focus on energy piles and other energy geostructures. The geotechnics literature in these topics has increased rapidly in the last five years suggesting a surge in this emerging research area. Here complementary lines of research can be distinguished, one focusing on thermal analysis and another focusing on thermo-geomechanical analysis. Limitations, shortcomings and knowledge gaps are identified and needs for further research and development within the geotechnical community are highlighted.

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Section: Numerical Simulationsmentioning

confidence: 98%

“…Lee at al. (2016) andZhang et al (2013Zhang et al ( , 2016aZhang et al ( , 2017 performed field scale and laboratory scale thermalCommented [1]: Reproduced with permission Licence Number 4585510080214.…”

mentioning

confidence: 99%

Energy geostructures: A review of analysis approaches, in situ testing and model scale experiments

Loveridge

McCartney

Narsilio

et al. 2020

Geomechanics for Energy and the Environment

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show abstract

“…Their results presented that the performance of heat exchanger anchors in the tunnel was preferable. Zhang et al [10,[25][26][27][28] conducted the field experiments, laboratory model tests, and numerical simulations to investigate the influences of various parameters (e.g., inlet water temperature, flow rate, pipe spacing, operation time, ventilation, and groundwater seepage) on the thermal responses of the energy tunnel GHEs. Bidarmaghz and Narsilio [29] developed a 3D numerical model to study the influences of groundwater flow and airflow inside the tunnel on the heat exchange mechanism of the energy tunnel system and found that the groundwater seepage and tunnel airflow affected the ground temperature field and thermal behaviors of the energy tunnel GHEs.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Thermal Performance of Energy Tunnel Equipped with the Insulation Layer Considering Ventilation and Groundwater Seepage

et al. 2021

Self Cite

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The insulation layer is usually installed in the tunnel structure, whereas the influence of the insulation layer on the thermal behavior of energy tunnel ground heat exchangers (GHEs) is rarely investigated. The model tests were performed in this study to evaluate the heat transfer potential of the energy tunnel with the insulation layer under ventilation and groundwater seepage. The results can be obtained as follows: first, the fluctuations of air temperature and surrounding rock temperature at different locations are relevant to insulation layer, ventilation, and groundwater seepage. Second, the reduction effect of ventilation on the interface temperature of tunnel lining and surrounding rock is alleviated when using an insulation layer, and the interface temperature at upstream section of groundwater seepage is more easily affected by the energy tunnel GHEs. Third, the variation range of ground temperature is wider at the downstream section of groundwater flow. Moreover, the heat exchange rates of tunnel without the insulation layer improve by 5.82% and 6.45% with increasing wind speed at two groundwater flow velocities of 1 × 10 − 4 and 5 × 10 − 4 m/s, and there are only 2.03% and 0.77% enhancements of heat exchange rates by ventilation for the tunnel with the insulation layer. However, the thermal performance of the energy tunnel improved by groundwater is less relevant to the existence of the insulation layer. The relevant findings can provide an effective guidance for the following research and design of the energy tunnel.

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“…Previous research on the temperature field in tunnel engineering mostly focused on the cold-region tunnel. Zhang et al [11] concluded that the flow of groundwater had a significant impact on the distribution of temperature of the surrounding rock by an experimental model test. He et al [12] tested the air temperature, wind force conditions and atmospheric pressure on the spot and proposed a new prediction model of freezing-thawing conditions concerning the combined convection-conduction in the rock surrounding tunnels in cold regions.…”

Section: Introductionmentioning

confidence: 99%

A Study on the Heat Transfer of Surrounding Rock-Supporting Structures in High-Geothermal Tunnels

Wang

Liu

et al. 2020

Applied Sciences

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The temperature distribution is one of the most vital parameters which should be fully considered in high geothermal tunnel design. For the purpose of studying the impact of temperature disturbance caused by construction on temperature distribution of surrounding rock and lining structure in a high geothermal tunnel, a new finite difference model for temperature prediction was proposed. Based on the abundant field test results, forecast analysis for the research of a high geothermal tunnel in this paper is made. The results indicate that the temperature of the surrounding rock near the tunnel sidewall decreases obviously in the first 14 days while that of the surrounding rock far away is stable after tunnel excavation, and the rock temperature showed three ways of change: undulate type (<2 m), decline type (2–5 m) and stable type (>5 m). There is a linear relationship between the initial rock temperature and the released heat of the surrounding rock. The radius of the heat-adjusting layer and the initial rock temperature presents a quadratic function relation. The lining concrete actually cures under the variable high-temperature environment and the real curing temperature decreases with time and becomes stable seven days later. The results would contribute to providing support for high geothermal tunnel research and design.

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The coupling effect of ventilation and groundwater flow on the thermal performance of tunnel lining GHEs

Cited by 42 publications

References 48 publications

Energy geostructures: A review of analysis approaches, in situ testing and model scale experiments

Energy geostructures: A review of analysis approaches, in situ testing and model scale experiments

Investigation of the Thermal Performance of Energy Tunnel Equipped with the Insulation Layer Considering Ventilation and Groundwater Seepage

A Study on the Heat Transfer of Surrounding Rock-Supporting Structures in High-Geothermal Tunnels

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