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- W2908573563 abstract "The success of a shield’s launch and reception processes for tunnels in sandy grounds with high water tables depends heavily on the ground improvement of the soils within the portal zone. To achieve this, a sealing process based on the cryogenic freezing principle is herein proposed. This process involves using liquid nitrogen as the working fluid to create a cryogenic environment, through which passing underground water would be frozen to create a seal. To confirm the feasibility of this method, full-scale experimental field tests were conducted, which include the design of the experimental device, the experimental process, and preparation of the experimental mud sample. The experimental results indicate that a thermal additive could accelerate the freezing speed, and the frozen device had a good sealing capacity when the hydraulic pressure was over 0.15 MPa. Additional information on the implementation of the feasibility test was also reported." @default.
- W2908573563 created "2019-01-25" @default.
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- W2908573563 date "2019-03-01" @default.
- W2908573563 modified "2023-09-27" @default.
- W2908573563 title "A new cryogenic sealing process for the launch and reception of a tunnel shield" @default.
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- W2908573563 doi "https://doi.org/10.1016/j.tust.2019.01.007" @default.
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