Research Article
Site Measurement and Study of Vertical Freezing Wall Temperatures of a Large-Diameter Shield Tunnel
Table 2
Design parameters of verticle ground freezing.
| Name | Parameter value | Name | Parameter value |
| Freezing pipe | φ127 × 5 mm 20# low-carbon steel seamless steel pipe | Saline temperature | −28∼−30°C | Feeding pipe | φ48 mm × 3.5 mm seamless steel pipe | Vaporization point | −33∼−35°C | Temperature measurement pipe | φ45 × 3 mm seamless steel pipe | Freezing zone original stratum temperature | ≤+30°C | Hole number | 57 vertical freezing holes and 6 temperature measuring holes | Cooling water temperature | +23°C | Depth of freezing hole | 31.2 m | Condensation temperature | +35°C | Total length of freezing hole | 1775.7 m | Cooling loss coefficient | 1.2 | Total length of temperature measuring hole | 93.5 m | Total required cooling | Q = 22.7 (10,000 calories per hour) |
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The original stratum temperature refers to the temperature after curing for 28 days. |