Segment Monitoring Method for Quasi-Rectangular Shield Tunnel

Abstract

The invention discloses a segment monitoring method of a quasi-rectangular shield tunnel. The method includes the following steps that: a total station is arranged at the rear part of the quasi-rectangular shield tunnel; a plurality of segment blocks are spliced together to form an integrated-loop segment of the quasi-rectangular shield tunnel, a plurality of segment blocks to be measured are selected from the plurality of segment blocks, and an intervisible state is constantly maintained between the segment blocks to be measured and the total station in a tunnel construction process; biaxial tiltmeters and target prisms are arranged on the segment blocks to be measured; the initial angles and current angels of the segment blocks to be measured are obtained through the biaxial tiltmeters, the initial coordinate information and current coordinate information of the target prisms are obtained through the total station; and the initial angles and current angels of the segment blocks to be measured are compared, and the initial coordinate information and current coordinate information of the target prisms are compared, and the convergence and deformation conditions of the segment blocks to be measured are obtained through analysis. According to the method of the invention, the biaxial tiltmeters form a sectional monitoring ring on the integrated-loop segment, and the target prisms and the total station are used in cooperation, so that the convergence information of the segment of the quasi-rectangular tunnel can be obtained.

Description

technical field [0001] The invention relates to the technical field of tunnel shield construction, in particular to a segment monitoring method for a rectangular shield tunnel. Background technique [0002] In recent years, with the increasing use of urban underground space, shield construction technology has been widely used in various underground projects due to its advantages of low impact on the surrounding environment, high safety, high molding quality and fast construction progress. Among them, it has become the main construction method for underground large-scale projects such as subway tunnel projects and municipal pipeline projects. During the construction of shield tunnels, for the segments that have just left the shield tail, local or overall deformation often occurs, which has been confirmed by many engineering practices, manifesting as segment misalignment, cracks, damage, and even axis deviation. , especially when crossing shallow river bottom soil, this probl...

AI Technical Summary

Problems solved by technology

The formed tunnel will also produce certain settlement and displacement during the long-term operation process. These deformations will generate shear stress on the section of the segment, resulting in dislocation, cracking, damage and water leakage of the segment, reducing the resistance of the segment structure. Compressive strength and anti-seepage pressure will have adverse effects on the normal use and durability of the tunnel

Images