Optimization Technology and Simulation Analysis of Transverse Accuracy of Cross Traverse Networks in Long Tunnels
The error of the planimetric control survey in the tunnel is the main factor that causes the transverse penetration error of the long tunnel,and the excessive transverse penetration error will bring some difficult engineering problems to the tunnel construction.Therefore,the research of the method of the planimetric control survey in the long tunnel has always been the research hotspot in this field.In this paper,the advantages and disadvantages of three main methods of planimetric control survey in the long tunnel are ana-lyzed,and the transverse error of conventional cross transverse network is relatively minimum among the three methods.Then,the main factor causing the transverse error of conventional cross traverse network is analyzed and the influence of side refraction is consid-ered.Therefore,the abnormally shaped cross traverse network is proposed on the basis of an optimized normally shaped cross traverse network.The simulation results show that this kind of network has the same lateral accuracy as the normally shaped cross traverse net-work,and is basically not affected by the side-refraction.Therefore,it is a recommended method for planimetric control survey in tunnels.
long tunnelsnormally shaped cross traverse networksabnormally shaped cross traverse networksroot mean square error of transverse penetrationsimulation calculationside refraction
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