Estimation method of extra-long tunnel horizontal through error

Abstract

The invention relates to an estimation method of an extra-long tunnel horizontal through error. Hole exterior and hole interior control measuring errors are not inevitable when a tunnel is excavated, and so that the tunnel opposite excavation has the through error. The estimation method provided by the invention comprises the following steps of: establishing a hole exterior horizontal control network, obtaining a breakthrough point coordinate form an inlet point, an outlet point and a directional point, estimating the horizontal through error caused by a hole exterior horizontal control measuring error according to a differential formula method; and then establishing a tunnel hole interior wire network, designing the wire network from the inlet and the outlet and a through surface in a simulating manner according to an equal side, and estimating a tunnel horizontal through error caused by the hole interior wire measuring error. The estimation method provided by the invention can be used for carry outing hole exterior GPS (Global Positioning System) network and hole interior wire net simulation and flat difference without measured data, the horizontal through error caused by the hole exterior GPS network measuring error and the horizontal through error caused by the hole exterior horizontal control measuring error of any length tunnel are estimated, and the problem of extra-long tunnel control measuring horizontal through error and control network optimization design is solved.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a method for estimating lateral penetration errors of super-long tunnels. Background technique [0002] Tunnel construction is characterized by either excavating from two openings in opposite directions, or starting from several openings (including horizontal holes, inclined shafts, vertical shafts, and parallel pilot pits), and then digging opposite to each other along the center line of the line after reaching the center line of the line. . That is to say, the construction method of "long tunnel and short construction" is generally adopted at present. Regardless of the construction method, the tunnel penetration error is an important indicator for evaluating the quality of tunnel construction. Although a high-precision independent construction control network outside the tunnel and inside the tunnel has been established before the tunnel construction,...

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Problems solved by technology

[0003] The existing "Specifications for Surveying High-Speed ​​Railway Engineering" does not clearly stipulate the penetration error of extra-long tunnels (20 kilometers and above), and the design institutes, construction units, and colleges and universities in the road currently do not specify the horizontal The problem of penetration error has been comprehensively and systematically studied, and the estimation and tolerance of the penetration error have not given a clear value in various specifications.

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