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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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Received: 12 April 2012
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2012, Vol. 31 
