Long-exposure oblique photography tunnel holographic measurement method

Abstract

The invention discloses a long-exposure oblique photography tunnel holographic measurement method. The method comprises the following implementation steps: marking image control points and measuring coordinates during drilling and lofting of a tunnel face; collecting tunnel body images with different angles, high resolution and rock stratum textures in a low-illumination environment through the long-exposure photography; identifying feature points on a plurality of cave body images for cave body images, calculating space coordinates of the feature points based on a multi-image space forward intersection method, and expanding the points to form a grid surface model, so as to obtain a digital surface model carrying stratum information and cave body contour surface undulation. The method hasthe advantages that equipment is simple, operation is convenient and fast, environmental constraints are small, the tunnel body condition can be restored in a full-information mode, in-tunnel construction is not affected, and the application range is wide.

Description

technical field [0001] The invention relates to tunnel section measurement technology, in particular to a long-exposure oblique photography tunnel holographic measurement method. Background technique [0002] Tunnel cross-section measurement is often carried out by total station or laser scanner, both of which use equipment to emit laser light and measure in polar coordinates. The equipment is expensive and can only obtain the surface contour data of the tunnel body, and cannot record geological information and blasting parameters. 1. The laser scattering is serious in the water-rich environment, and the signal return rate is low. The geological survey of the face is still at the stage of geological sketches or local planar images. The subjective influence of geological records is great, and the overall traceability of geological conditions is not strong. "Measuring the section for the sake of measuring the section" essentially ignores the geological properties of the tunne...

AI Technical Summary

Problems solved by technology

[0002] Tunnel cross-section measurement is often carried out by total station or laser scanner, both of which use equipment to emit laser light and measure in polar coordinates. The equipment is expensive and can only obtain the surface contour data of the tunnel body, and cannot record geological information and blasting parameters. , Laser scattering is serious in water-rich environment, and the signal return rate is low

The geological survey of the face is still at the stage of geological sketches or local planar images. The subjective influence of geological records is great, and the overall geological situation is not very traceable.

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