Theoretical analysis of the influence of plane control network on lateral breakthrough error

What is it about?

There is extremely strict precision requirement for the lateral breakthrough error of long immersed tunnel in the offshore island and tunnel project, but the point location layout range of the outer plane control network is limited in the artificial island, and the space inside the tunnel is long and narrow, which is not conducive to high-precision through-measurement control. A mathematical model of the influence of the lateral breakthrough error caused by the orientation direction of the outer control point and the position of the breakthrough point has been established through the theoretical analysis in this study, and the favorable orientation directions and the favorable penetration point are analyzed.

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Why is it important?

In order to further lower the lateral penetration error of long-distance immersed tunnels, the influences of the direction of the orientation edge of the ground GNSS control network and the position of the breakthrough plane on the lateral penetration error are analyzed in this study, and possible optimization design schemes for the through out measurement are proposed to provide reference for similar engineering construction.

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