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

A technology of close-range photography and tunneling, which is applied in the direction of measuring devices, optical devices, instruments, etc., and can solve problems such as difficulty in meeting exposure time, insufficient natural light space, etc.

Pending Publication Date: 2018-08-28
中铁八局集团第二工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

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Embodiment Construction

[0086] The present invention will be further described below in conjunction with accompanying drawing:

[0087] The present invention The present invention realizes above-mentioned purpose through following technical scheme:

[0088] Such as figure 1 As shown, a method for rapid deformation measurement of tunnels using close-range photography, including camera calibration, image acquisition, spatial three-matching, point cloud generation and deformation detection;

[0089] S1. Camera calibration, by establishing the corresponding relationship between known object points and image points, calculate the internal orientation elements of the imaging system;

[0090] Specifically include the following steps:

[0091] A1. Fix the camera to shoot the calibration plate, obtain the image of the calibration plate, and obtain the equation according to the imaging model of the collinear equation of the camera:

[0092]

[0093] The eigenvector corresponding to its minimum eigenvalue...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/16
CPCG01B11/16
Inventor 谭俊张瑞卢勇张献州陈强张波岳绍忠
Owner 中铁八局集团第二工程有限公司
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