高承压含水层中更换盾尾刷长距离液氮冻结技术  

Technology of Long-distance Liquid Nitrogen Freezing in Replacing Shield Tail Brushes in High-confined Aquifer

作　　者：陈成[1] 杨平[1] 张婷[1] 史志铭 

机构地区：[1]南京林业大学土木工程学院,江苏南京210037 [2]中煤五建集团公司上海分公司,上海200135

出　　处：《施工技术》2011年第4期74-77,共4页Construction Technology

基　　金：江苏省"六大人才高峰"计划资助项目(2004)

摘　　要：以杭州庆春路过江隧道为例,论述了长距离液氮冻结需要解决的关键技术,介绍了该工程的冻结参数设计、施工工艺以及测温系统布设与冻土帷幕判断、盾尾刷更换应具备的条件、强制解冻设计及盾构重新推进条件判断等。结果表明,长距离液氮冻结在封水应用中有着显著成效,与注浆法和盐水冻结法相比技术可靠、安全性好、节约工期,解决了承压含水层中封水更换盾尾刷的难题。Based on Qingchun Road cross-river tunnel of Hangzhou,the key technologies of long-distance liquid nitrogen freezing are obtained.The project design,construction techniques,layout of temperature measurement system,thickness of frozen soil determination,the qualifications of shield tail brush replacement,compulsory thaw design and the condition of shield to re-promote are introduced.The results show that long-distance liquid nitrogen freezing has a significant effect in sealing water.Compared with grouting method and brine freezing,the technology is reliable,safe and saving time limit.It has resolved the confined aquifer in the shield tail sealing water replacement brush problem.

关 键 词：盾构 长距离液氮冻结 高承压含水层 冻结参数 冻结帷幕 盾尾刷更换 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]