Abstract
Spread-footing foundations embedded in frozen soil are subject to both the wind-induced uplift and frost heave forces. The stress and deformation of foundations in the Qinghai-Tibet Power Transmission Line (QTPTL) engineering were monitored to investigate the stress state of the tower foundations. The results showed that the stresses at the bases of tower foundations had a close relationship with air and ground temperatures. Seasonal variations in the contact stress depended on the seasonal freezing and thawing of foundation soil. The contact stress increased with the cooling of the underlying soils and decreased with the warming of the underlying soils. The numerical simulation results showed that the frost heave force induced by soil freezing potentially threatens the safety and normal operation of the QTPTL. Thaw settlement may lead to harmful deformation of tower foundations if global warming is considered in the numerical model. The remedial measure with thermosyphons only can reduce the settlement of the foundation and will increase the frost jacking risk of the foundation.
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Acknowledgements
This research project was supported by the Natural Science Foundation of China (Grant No. 41771073, 41471061 and 41690144), the Research Project of the State Key Laboratory of Frozen Soils Engineering (SKLFSE-ZT-22) and the Major Program of Bureau of International Cooperation, the Chinese Academy of Sciences (131B62KYSB20170012).
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Wen, Z., Sun, Z., Zhang, S. (2018). Study on the Stability of Spread-Footing Foundations on Permafrost Regions. In: Wu, W., Yu, HS. (eds) Proceedings of China-Europe Conference on Geotechnical Engineering. Springer Series in Geomechanics and Geoengineering. Springer, Cham. https://doi.org/10.1007/978-3-319-97115-5_116
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DOI: https://doi.org/10.1007/978-3-319-97115-5_116
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