Anchor rod pallet load visualization digital imaging method

Abstract

The invention relates to an anchor rod pallet load visualization digital imaging method suitable for a non-contact measurement method of a stressed underground anchor rod. The anchor rod pallet load visualization digital imaging method specifically comprises the following steps: a plurality of images of a pallet before and after a deformation is shot using a CCD camera, space identification is performed on the multiple images of the pallet before and after the surface deformation through adoption of a digital speckle correlation technology, a three-dimensional coordinate is obtained through calculation, a three-dimensional model before and after the surface deformation of the pallet is established through fitting, and data before and after the surface deformation of the pallet are obtained; and a strain field is obtained through a rapid three-dimensional deformation analysis and comparison of the three-dimensional space data before and after the deformation of the pallet, a stress field is obtained through a combination with pallet bending rigidity, and a real-time load of an anchor rod can be obtained through integral back calculation of the stress field. Compared with a traditional strain foil, a traditional displacement sensor, a traditional anchor rod puller and a traditional hydraulic pillow, the anchor rod pallet load visualization digital imaging method is advantageous in that usage of a pallet load visualization digital imaging technology is simple and convenient, and three-dimensional deformation and strain measurement are achieved rapidly.

Description

technical field [0001] The invention relates to a visual digital imaging method for the anchor rod tray load, which is suitable for the non-contact measurement method of the stress of the anchor rod in underground mines and tunnels. Background technique [0002] Bolt is the most widely used support and reinforcement method in mining engineering. The purpose of bolt load observation is to analyze the load change of the bolt during the service period of the roadway, monitor the working state of the bolt, and provide actual measurements for adjusting and modifying support parameters. in accordance with. The bolt is installed in the borehole and is in a closed state, so it is impossible to directly observe its stress and strain. Traditional contact measurement methods, such as strain gauges, optical fiber sensors, displacement sensors, etc., have single functions, few measurement points, and limited data. And the shortcomings of large theoretical calculation errors; the non-con...

AI Technical Summary

Problems solved by technology

The bolt is installed in the borehole and is in a closed state, so it is impossible to directly observe its stress and strain. Traditional contact measurement methods, such as strain gauges, optical fiber sensors, displacement sensors, etc., have single functions, few measurement points, and limited data. And the shortcomings of large theoretical calculation errors; the non-contact visual measurement method is developing rapidly due to its speed and convenience, and is gradually developing from the traditional coordinate visual measurement of marker points to three-dimensional full-field visual measurement

[0003] Only by measuring the dynamic deformation and strain data of the three-dimensional full-field of the bolt can accurately reveal its dynamic performance. Therefore, it is urgent to accurately measure the deformation of the three-dimensional full-field under complex working conditions to provide scientific data for the related research of the bolt. Now Some traditional contact-based detection methods cannot solve this problem well due to their own problems.

Images