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《Traffic Engineering and Technology for National Defence》 2009-04
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Study of Improving the Design of and Engineering Application of TBM Tools to the Nanjing Yangtze River Tunnel

Zhang Gongshe(14th Bureau Group Co.,Ltd.,Railway Building Corporation of China,Jinan 250014,China)  
The Nanjing Yangtze River Tunnel under construction is about 2900 m in chainage,with bidirectional six lanes in two tunnels in design.The section mainly involves fine sand and gravel in geology.The originally designed cutting tool for the tunnel is a once-and-for-all one,without the needs of replacing it midway.However,the cutting tools suffered from serious wear failures during the practical construction.An all-round analysis is made in the paper of the status quo of failures happening to the original tools for the Nanjing Yangtze River Tunnel from the angles of such aspects as geology,layout of tools,material selection,and techniques,upon the basis of which proposals on the design improvement are brought forward,namely,enlarging the cross-section sizes of the hard alloy,and the width of the monoblock alloy of the cutting tool,improving the welding technique,and optimising the tunneling parameters.It is proved in practical work that the improved tools are fully adaptable to the current geological conditions,and the distance for tool changing has increased from fewer than 50 rings(100 m) before the improvement to more than 300 rings(600 m),with economic benefits remarkably promoted for the project.
【CateGory Index】: U455.3
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