High-precision tunnel slab staggering positioning system and method based on low-coherence interference technology

Abstract

The invention aims to provide a high-precision tunnel slab staggering positioning system and method based on a low-coherence interference technology. The system comprises a broadband light source, a first optical fiber cable, a second optical fiber cable, a third optical fiber cable, a first coupler, a second coupler, three LCI displacement meters, an optical mobile scanning platform, an optical fiber with a flat tail end, and a signal collection and processing system. According to the invention, the 3D printing technology and the Michelson low-coherence interference technology are combined; the sensor has the advantages of convenience, quickness, low cost, improvement of the monitoring stability of the sensor and the like of a 3D printing manufacturing technology, also has the advantagesof high precision, strong electromagnetic interference resistance and suitability for long-term monitoring of tunnels of a low-coherence interference technology, and can be applied to engineering practical situations.

Description

technical field [0001] This application relates to the technical field of monitoring shield tunnel misalignment, in particular to a high-precision tunnel misalignment positioning system and method based on Low-coherence Interferometry (LCI) technology. Background technique [0002] As an emerging technology of rapid prototyping, 3D printing technology has developed rapidly in recent years. Its basic idea is: based on digital model files, using bondable materials, through layer-by-layer processing and layer-by-layer superposition molding way to get 3D solids. [0003] As the construction of shield tunnels has gradually become the main construction form of subway, underwater and other traffic tunnels, the lining ring is mainly assembled from prefabricated segments, and the segments are connected by bolts. The bending rigidity of the segment is different from that of the segment, and the relative displacement of the joint may occur due to uneven stress on the segment, resultin...

AI Technical Summary

Problems solved by technology

[0007] Patent Publication No. CN105089702A discloses a system and method for large-scale and high-precision online monitoring of shield tunnel misalignment. Although the system is simple in structure and low in cost, the technology based on the patent is Brillouin technology; the patent disclosure No. CN110044268A describes the shield tunnel seam opening and stagger monitoring system based on the principle of optical fiber reflection, which uses different light reflectivities to calibrate the amount of seam staggering, but does not mention which one to use specifically Fiber Optic Sensor

[0008] As an emerging monitoring technology, fiber optic sensors are increasingly used in tunnel disease monitoring. However, no method based on Michelson low-coherence interferometric fiber optic sensing technology has been found in the current monitoring methods for tunnel segment misalignment.

Images