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Volume 34 Issue 1
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CHEN Cheng, YANG Ping, ZHANG Ting, SHI Zhi-ming. Temperature measurements of long-distance liquid nitrogen freezing in high-confined aquifer reinforcement[J]. Chinese Journal of Geotechnical Engineering, 2012, 34(1): 145-150.
Citation: CHEN Cheng, YANG Ping, ZHANG Ting, SHI Zhi-ming. Temperature measurements of long-distance liquid nitrogen freezing in high-confined aquifer reinforcement[J]. Chinese Journal of Geotechnical Engineering, 2012, 34(1): 145-150.
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Temperature measurements of long-distance liquid nitrogen freezing in high-confined aquifer reinforcement

  • 1. School of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China; 2. Shanghai Branch, The Fifth China Coal Construction Company, Shanghai 200135, China)

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  • Received Date: November 17, 2010
  • Published Date: January 19, 2012
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    • Abstract
  • Based on the Qingchun Road cross-river tunnel of Hangzhou, frozen parameters and process of long-distance liquid nitrogen freezing in high-confined aquifer are obtained, and field measurements of freezing temperature are performed. The results show that the long-distance liquid nitrogen freezing temperature should be guaranteed in the way when the temperature reaches the working liquid nitrogen below -100℃, and the exit temperature after cycling should be held between - 50℃ ～ - 70℃. By using three 1 cm-thick layers of polyethylene insulating materials and three layers of sealed film alternately, the heat preservation effect is obvious, the package temperature has a rise of 0.070 ℃ / m, and the longest distance for the liquid nitrogen freezing can reach 1000 m. The development speed of permafrost from large to small order is gravel layer> silt sand layer> silt clay layer. The temperature of segment is affected by external environment, and the temperatures at segment-shield shell interface before, during and after welding of shield tail brushes are 5.4℃ ～ - 3.2℃, 19.3℃ ～ 8.7℃ and 12.7℃ ～ 4.8℃ so as to ensure the thawing and welding quality of frozen walls. Compulsory thawing only needs 2 days to achieve the condition for the shield, and this procedure has a total duration of 23 days, which solves the problem of replacing shield tail brushes in confined aquifer.
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    • References (12)
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