关键词: 液氮冻结技术, 承压水地层, 盾尾密封刷, 检修

Abstract:

The application of liquid nitrogen freezing technology in maintaining of the tail skin brushes in stratum with confined groundwater is presented on basis of the actual experience in Qiantang River crossing tunnel at Qingchun Road in Hangzhou. The freezing hole design, refrigeration design, temperature monitoring and freezing hole construction are presented in detail. The practice shows that the problem of stratum consolidation and water sealing during the tail skin brush maintenance can be successfully solved by liquid nitrogen freezing technology. This technology can provide reference for shield boring in similar stratum with confined groundwater in the future.

Key words: liquid nitrogen freezing technology, stratum with confined water, tail skin brush, maintenance