SUMMARIES OF KEY TECHNOLOGIES AND DIFFICULTIES IN NANJING YANGTZE RIVER TUNNEL PROJECT
GUO Xinjun1，2，MIN Fanlu3，ZHONG Xiaochun3，ZHU Wei4
(1. School of Civil Engineering，Central South University，Changsha，Hunan 410083，China；2. China Railway Construction Corporation Limited，Beijing 100855，China；3. College of Civil and Transportation Engineering，Hohai University，Nanjing，Jiangsu 210098，China；4. National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety，Hohai University，Nanjing，Jiangsu 210098，China)
Abstract：Nanjing Yangtze River tunnel was constructed by slurry shield with diameter of 14.93 m. Along the 3 020 m tunnel，a highly permeable gravel stratum under water pressure of 0.65 MPa was passed through successfully. In the project，the most difficult tunnel with giant size across the Yangtze River，several construction difficulties were overcome，such as opening chamber under high pressure and under-passing the section of super shallow cover under the Yangtze River. Based on conditions of the site，difficulties faced with the project were analyzed and key technologies including filter cake formation and opening chamber under pressure were summarized systematically. These achievements would play a significant role in developing the technology of slurry shield with large size in China.
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2012, Vol. 31 
