Finite-Element Analysis of Heat Transfer of Horizontal Ground-Freezing Method in Shield-Driven Tunneling
Publication: International Journal of Geomechanics
Volume 17, Issue 10
Abstract
When applying the artificial ground-freezing method in a shield-driven tunnel, the design of the freezing zone and freezing time is of practical interest. Therefore, the distribution and evolution of heat transfer in a frozen soil wall are key issues in the examination of the freezing effect. In this study, the horizontal ground-freezing method for soil reinforcement in shield-driven tunneling was considered. A cup-shaped freezing scheme was adopted at the launching shaft of the shield-driven tunnel. Three-dimensional (3D) finite-element analysis was used to examine the heat transfer within the cup-shaped frozen soil wall. By this method, the feasibility of the artificial ground-freezing method in the shield tunneling of Nanjing Subway Line 10 was demonstrated. Four types of soil were considered as the in situ soils surrounding the shield machine: sandy, cement-admixed sandy, soft clay, and cement-admixed soft clay. The simulation results indicate that the cement-admixed sandy soil was the most favorable material in terms of ground freezing; it had the highest decreasing rate of temperature in the process of ground freezing. In contrast, the soft clay was the most unfavorable material in terms of ground freezing. The results imply that the closure time of the cup-shaped frozen soil wall was sensitive to the thermal physical properties of soils in addition to the in situ water content.
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Acknowledgments
This research was supported by the Key Research & Development Science and Technology Cooperation Program of Hainan Province, P. R. China (Grant ZDYF2016226), the National Science Foundation of China (51368017), and the China Scholarship Council Project (201607910002).
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Published In
International Journal of Geomechanics
Volume 17 • Issue 10 • October 2017
Copyright
© 2017 American Society of Civil Engineers.
History
Received: Nov 2, 2016
Accepted: Apr 25, 2017
Published online: Jul 17, 2017
Published in print: Oct 1, 2017
Discussion open until: Dec 17, 2017
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