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Construction Ground Freezing—A Look at Modeled versus Measured Performance
An LNG storage tank in Fairbanks, Alaska, is one of the first LNG storage tanks constructed on permafrost soils that has been designed as an at-grade foundation. An at-grade mat foundation was selected for this tank over the typical pile supported foundations due to the seismic hazards at the site. Above-grade construction activities for the LNG storage tank were planned to occur over an 18-month period. The construction included a large poured concrete mat foundation, which generated significant heat during curing and had the potential of impacting the underlying permafrost. In addition, the outer concrete tank shell was planned to be heated over the next year to facilitate construction of the inner steel tank. An active cooling system installed below the storage tank was designed, constructed, and used to maintain the permafrost, thereby mitigating the thermal impacts of tank construction activities. Thermal finite element modeling of the system was performed before construction to develop an adequate design. During construction, soil temperature measurements were collected at and above the level of the active cooling system to monitor system effectiveness. Comparisons between the modeled and actual soil temperatures are compared and an evaluation of the active cooling system is presented.
Construction Ground Freezing—A Look at Modeled versus Measured Performance
An LNG storage tank in Fairbanks, Alaska, is one of the first LNG storage tanks constructed on permafrost soils that has been designed as an at-grade foundation. An at-grade mat foundation was selected for this tank over the typical pile supported foundations due to the seismic hazards at the site. Above-grade construction activities for the LNG storage tank were planned to occur over an 18-month period. The construction included a large poured concrete mat foundation, which generated significant heat during curing and had the potential of impacting the underlying permafrost. In addition, the outer concrete tank shell was planned to be heated over the next year to facilitate construction of the inner steel tank. An active cooling system installed below the storage tank was designed, constructed, and used to maintain the permafrost, thereby mitigating the thermal impacts of tank construction activities. Thermal finite element modeling of the system was performed before construction to develop an adequate design. During construction, soil temperature measurements were collected at and above the level of the active cooling system to monitor system effectiveness. Comparisons between the modeled and actual soil temperatures are compared and an evaluation of the active cooling system is presented.
Construction Ground Freezing—A Look at Modeled versus Measured Performance
Daggett, A. P. (author) / Thornley, J. D. (author) / Yarmak, E. (author) / Zarling, J. (author) / Mehta, S. (author)
18th International Conference on Cold Regions Engineering and 8th Canadian Permafrost Conference ; 2019 ; Quebec City, Quebec, Canada
Cold Regions Engineering 2019 ; 382-390
2019-08-08
Conference paper
Electronic Resource
English
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