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地下水位埋深较浅、地层软弱复杂环境下,盾构洞门冻结法加固时,在洞门周围布置水平冻结孔,并在冻结孔中循环低温盐水,使冻结孔附近的含水地层结冰,形成强度高,封闭性好的冻结壁(冻结帷幕),然后在冻结壁的保护下进行盾构始发、接收作业。
When the shield tunnel door freezing method is used to reinforce the shield tunnel, horizontal frozen holes are arranged around the door of the tunnel, and low temperature brine is circulated in the frozen holes to freeze the hydrous stratum near the frozen holes. The formation of high strength, closed good frozen wall (frozen curtain), and then under the protection of the frozen wall shield originating, receiving operations.