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| Research on the Application of Artificial Freezing Technology Inside the Tunnel with Subsurface Excavation |
| YUAN Yun - hui1, YANG Ping2 |
| (China Railway Tunnel Survey & Design Institute Co. Ltd，Tianjin 300133， China; 2. Nanjing Forestry University， Nanjing，Jiangsu 210037, China) |
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Abstract Abstract ： Research purposes ： During the construction of tunnel with subsurface excavation of Shang - Xin tunnel in Nanjing metro line No. 2 water inrush and gushing mud disaster occured. A safe， reliable and strong applicability technical measure must be used to close seepage path. At the same time impact on surrounding environment must be minimized. Research conclusions: Numerical model of freezing thermal field and tunnel excavation is built for water inflowing tunnel in Shang - Xin tunnel of Nanjing metro line No. 2 by ADINA to solve the problem. （1 ) The calculation result and engineering practice demonstrated that the application of vertical artificial freezing can effectively solve the problem of muddy burst in subsurface tunnel. （2) The distance of freezing pipes should less than 1. 2 meter so as to get effective freezing wall. (3) Thickness of frozen wall keeping in 1. 6 ?2. 0 m is safe and reasonable. (4 ) Temporary support measures must be taken on the procession of tunnel excavation after frozen. (5 ) Artificial freezing method as an effective check water and supporting method in mining method in the process of the tunnel through the permeable layer has extensive application prospect.
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Received: 29 February 2016
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2016, Vol. 33 
