Stochastic Thermal-Mechanical Characteristics of Frozen Soil Foundation for a Transmission Line Tower in Permafrost Regions
Publication: International Journal of Geomechanics
Volume 18, Issue 3
Abstract
The Qinghai–Tibet Power Transmission Line (QTPTL), crossing about 550 km of permafrost region, was constructed between July 2010 and October 2011. The long-term thermal-mechanical stabilities attract extensive attention because of global warming and engineering activities. Conventional calculation and prediction of the thermal-mechanical characteristics of a frozen soil foundation for the QTPTL always involve deterministic analysis. This study aimed to investigate the uncertain thermal-mechanical characteristics of a transmission tower foundation by a stochastic analysis method. Considering the effect of stochastic temperature on the stochastic deformation, a stochastic coupling computer program was compiled. The random temperature fields and random deformation fields of foundation soils for a transmission line tower in a permafrost region were calculated and predicted for the next 30 years. This work provides a novel method to analyze the stochastic thermal-mechanical characteristics of a frozen soil foundation for a transmission line tower in permafrost regions. The average standard deviations of temperature grew from 1.1 to 1.6°C on January 15, and the maximum standard deviations of temperature were grew from 3.0 to 3.5°C. The average standard deviations of vertical displacement grew from 0.46 to 0.79 cm on January 15, and the maximum standard deviations of vertical displacement grew from 1.81 to 21.2 cm. The increase of standard deviations implies that the results of conventional prediction methods for temperature and deformation may be deviate from the exact value. These results can clarify the stochastic thermal-mechanical characteristics of frozen soil foundations for the QTPTL in permafrost regions.
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Acknowledgments
The authors thank EIC, the processing editor, and the three anonymous reviewers for their comments and advice. This research was supported by the Fundamental Research Funds for the Central Universities (Grant 2017QNA30).
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Published In
International Journal of Geomechanics
Volume 18 • Issue 3 • March 2018
Copyright
© 2017 American Society of Civil Engineers.
History
Received: Mar 3, 2017
Accepted: Sep 14, 2017
Published online: Dec 21, 2017
Published in print: Mar 1, 2018
Discussion open until: May 21, 2018
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