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The setting up of directing system on shield tunnel

LUO San-ming,WAN Wen-ni,GAO Pei-zhi,SU Jian-feng(GIS Department,First Monitoring Center,China Earthquake Administration,Tianjin 300180,China)  
Introducing the factors affecting shield tunnel orientation,detailing the process of building mathematical model on directing construction of Metro Tunnel,presenting the method of determining state parameters of Tunnel Boring Machine(TBM) and elements of affecting TBM's state parameters,as well as correcting them.In the course of application of Shen Zhen subway's construction,implementing the tunnel's holing through smoothly,supporting the tunnel's boring quality. Accuracy of tunnel's breaking through reaches requirement of good engineering.
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