Estimating the geothermal potential of heat-exchanger anchors on a cut-and-cover tunnel

Mimouni, Thomas; Dupray, Fabrice; Laloui, Lyesse

doi:10.1016/j.geothermics.2014.02.007

Cited by 44 publications

(10 citation statements)

References 22 publications

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“…Mimouni and Laloui estimated the geothermal potential of heat exchanger anchors on a cut-and-cover tunnel, and the numerical simulation results showed that the extractable heat from the ground through the anchors ranges from 0.4 to 0.8 GWh per year and per kilometer of tunnel [63]. Barla et [67].…”

Section: Geothermal Heat Collection From Tunnel (Energy Tunnel)mentioning

confidence: 99%

A New Environmentally Friendly Utilization of Energy Piles into Geotechnical Engineering in Northern China

Peng

Huang

2021

Advances in Civil Engineering

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In the past 30 years, because of built-in advantages, energy saving, pollution control, and sustainability, the energy pile system has had a rapid development around the world. Many scholars did numerous researches on the parameters’ optimization, heat exchange efficiency, and structure-soil response. Also, the researches of evolutional GSHP system using high temperature in deep mine and lager collection surface of tunnel lining were learned. At present, most of researchers are discussing the geothermal collection for the heating or cooling the building, and plenteous and significant research achievements have been obtained. It is a novel attempt to apply energy pile to geotechnical engineering, and good results have been achieved in engineering practice in Northern China. The area of northern China is a typical seasonal frozen region: the high temperature in summer and the cold weather and accumulated snow in winter will result in huge challenge and resource consumption of maintaince on highway tunnel, pavement, and other geotechnical engineering facilities. In this paper, taking example of using the geothermal heat exchanger to melt snow, the novel idea of using energy piles to prevent track in summer and crack in winter of pavement, and guaranteeing the safety of frost crack on tunnel lining were discussed. Also, through simulation research, we propose a buried pipe form with good heat transfer uniformity-spiral buried pipe, which has better engineering applicability. This shows us that the application of energy pile in geotechnical engineering will provide solutions to geotechnical problems, which will have a brilliant future.

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Section: Geothermal Heat Collection From Tunnel (Energy Tunnel)mentioning

confidence: 99%

A New Environmentally Friendly Utilization of Energy Piles into Geotechnical Engineering in Northern China

Peng

Huang

2021

Advances in Civil Engineering

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“…In addition, Insana and Barla [23] found that the direction of groundwater seepage, flow rate of circulating fluid, inlet temperature of circulating fluid, and sizes of pipe could impact the thermal performance and efficiency of the energy tunnel GHE system. Mimouni et al [24] used the anchors as the heat exchangers in a cut-and-cover tunnel and analyzed the effects of different influencing factors of soil properties, water table level, and service thermal loads on the geothermal potential of heat exchanger anchors within the energy tunnel. Their results presented that the performance of heat exchanger anchors in the tunnel was preferable.…”

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

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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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“…e rapid development of transportation systems has led to progressive growth of tunnel construction in cold regions; however, damage caused by freezing of tunnels constructed in cold regions also commonly occurs [1][2][3][4][5]. Problems associated with frost damage, including lining leakage, spalling of lining, frost heave of the surrounding rock, and watering and freezing of the road surface, often render the tunnel unusable from August to September annually, significantly affecting the efficiency of the tunnel [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Thermal Conductivity Characteristics of Thermal Insulation Materials Immersed in Water for Cold‐Region Tunnels

Sun

Zhuang

et al. 2020

Advances in Materials Science and Engineering

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This study investigates the distribution of pore water on the basis of the measured mass moisture content after soaking the tunnel insulation material. This study also analyzes the influence of the distribution of pore water on the thermal conductivity of the material on the basis of this mass moisture content. Scanning images of phenolic and polyurethane insulation boards are obtained by computer tomography (CT). The gray volume moisture content (Gv) is deduced based on the CT scanning images, to determine the distribution of pore water (Gv is the ratio of the volume of the water sample (represented by the gray value) to the volume of the saturated water sample (represented by the gray value) which is the gray volume moisture content of the sample). The correlation between gray volume moisture content and mass moisture content is determined by comparing different algorithms of gray volume moisture content and volume moisture content. The relationship between mass moisture content and thermal conductivity can be determined using a self-made quasi-steady-state tester, whereas the relationship between gray volume moisture content and thermal conductivity can be derived indirectly. Related experimental research can predict the thermal conductivity of thermal insulation materials by using a new perspective and shows the influence of pore water distribution on the thermal conductivity of materials.

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Estimating the geothermal potential of heat-exchanger anchors on a cut-and-cover tunnel

Cited by 44 publications

References 22 publications

A New Environmentally Friendly Utilization of Energy Piles into Geotechnical Engineering in Northern China

A New Environmentally Friendly Utilization of Energy Piles into Geotechnical Engineering in Northern China

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

Thermal Conductivity Characteristics of Thermal Insulation Materials Immersed in Water for Cold‐Region Tunnels

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