Method for carrying out tunnel rapid deformation measurement by close-range photography

Abstract

The invention discloses a method for carrying out tunnel rapid deformation measurement by close-range photography. The method includes camera calibration for calculating the internal orientation element of an imaging system; image acquisition for placing a stereoscopic photography system in the tunnel to acquire the images of the measurement area; three-dimensional matching for giving the rough offset amount between the two images of the matched image pair; point cloud generation for generating the three-dimensional point cloud of the internal structure of the tunnel to construct a three-dimensional model; deformation detection for acquiring the three-dimensional point cloud generated at different time phase in the same region and fitting the generated three-dimensional point cloud by means of kriging interpolation to obtain a fitted curved surface, making the difference of the fitted curved surface at different time phases to obtain a point cloud interpolation graph, so that the deformation monitoring of the tunnel is realized. According to the method for carrying out the tunnel rapid deformation measurement by close-range photography, the photographing measurement is assisted bya multi-camera stereoscopic photography system to obtain the inner orientation element and the distortion parameter of the camera, so that the three-dimensional modeling of the surface of the tunnel is realized, and the deformation of the tunnel in the construction period is monitored.

Description

technical field [0001] The invention relates to the technical field of deformation monitoring, in particular to a method for fast deformation measurement of tunnels by using close-range photography. Background technique [0002] The economic development of society is inseparable from the support of transportation. Especially in remote mountainous areas, traffic factors are particularly important, but due to its own complex terrain, it has inherent disadvantages in material communication with the outside world. Considering factors such as cost and convenience, the method commonly used nowadays is to use tunnels to penetrate the mountain. The tunnel has the characteristics of large cross-section, many auxiliary facilities, and high requirements for the operating environment. It requires a high technical level for tunnel construction. Especially with the rapid development of emerging expressways and high-speed railways, the quality and safety requirements of tunnel engineering...

AI Technical Summary

Problems solved by technology

However, during the construction and operation of the tunnel, there are insufficient natural light or limited space constraints, especially during the construction of the tunnel due to the influence of dust and other effects, it is difficult to meet the requirements of the exposure time when shooting with the hands of the operators

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