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| Construction monitoring method of connecting passage freezing method in saturated silt formation under the combined action of water flow and salt |
| LONG Daoxuan1, WANG Kai1, HE Hongyuan1, ZHANG Haidong2*, WANG Changhong2
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1. The 3rd Engineering Co., Ltd., China Railway Tunnel Group, Shenzhen 518000, Guangdong, China;
2. Department of Civil Engineering, Shanghai University, Shanghai 200444, China |
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Abstract Based on the engineering background of 4# connecting passage of Nantong Urban Rail Transit Line 1, the multi-field coupling variation law of freezing construction process was studied through monitoring data. A new multi-physical field data monitoring equipment was developed, and its basic characteristics and installation location were introduced. Finally, the monitoring data were analyzed and compared with the simulation results. The results showed that considering the dual influences of salinity and water flow in the saturated silty sand layer, the salinity slowed down the temperature of the soil in the early freezing stage, and the water flow caused the cooling capacity of the upstream Shennan Road Station to flow into the downstream Yongxing Avenue Station, which in turn delayed the actual freezing construction time by 10 days than expected. The above monitoring work ensures the safety of the construction of the connection aisle freezing method and provides reference data for other similar projects.
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Received: 22 October 2021
Published: 20 September 2022
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