Abstract:

A case study is conducted on a superlong waterdiversion tunnel in Xinjiang, China, to address the many disadvantages of the current plane control network, such as low precision, large lateral swing, and penetration error. A novel plane control measurement network is designed based on observations from fixed and free measurement stations. Computer simulation is used to generate simulated observation values for the network, and the transverse penetration error in the tunnel is estimated after processing. The designed network is then used to measure the actual plane control network in the tunnel. The results show that the precision indices of the tunnel plane control network obtained by the recommended network can meet the secondary requirements of the tunnel, and the precision of transverse penetration estimated from the measured data is close to the simulation results, validating the feasibility and reliability of the simulation calculation method in estimating the precision of the plane control network in a tunnel.

Key words:  , super-long tunnel, root mean square error of transversal penetration, free station, simulation calculation