Method for measuring surface roughness of tunnel lining concrete segment

Abstract

The invention discloses a method for measuring the surface roughness of a tunnel lining concrete segment. The method comprises the following steps of: 1, calibrating a measurement sub-surface, wherein the measurement sub-surface comprises a calculation sub-surface and a characteristic sub-surface; step 2, image acquisition: the illumination is controlled to be 250-400 lux during photographing; the same photographing equipment is adopted on the surface of the same tunnel lining concrete segment; the distance between a lens of the photographing equipment and the surface of the tunnel lining concrete segment is controlled to be 30-50 cm; 3, cutting and preprocessing the image; 4, measuring the actual roughness; 5, calculating image feature parameters; step 6, selecting a roughness calculation general formula; step 7, calculating a measured sub-surface roughness calculation value; 8, determining an error correction coefficient; and step 9, calculating the surface roughness of the lining concrete segment. According to the method, random errors in the measurement process can be reduced to the maximum extent, the measurement precision is improved, and the method is efficient, easy to operate and low in cost and has good application prospects and popularization value.

Description

technical field [0001] The invention relates to the application field of concrete material surface image processing, in particular to a method for measuring the surface roughness of tunnel lining concrete segments. Background technique [0002] Tunnel lining concrete segment is widely used in mud-water shield tunnel engineering, and it is a permanent structure that supports and maintains the long-term stability of the tunnel. The surface roughness of the concrete segment is an important parameter for calculating the roughness of the tunnel wall and measuring the strength and sealing degree of the cemented surface between the segment and the surrounding rock and soil or the secondary lining concrete. It is of great engineering value and theoretical significance to study high-precision and high-efficiency concrete segment roughness measurement methods. [0003] At present, there are many methods for measuring the surface roughness of concrete, which are mainly divided into tw...

AI Technical Summary

Problems solved by technology

[0005] 1. Digital image technology is easily restricted by the measurement environment and operating methods, and it is impossible to obtain high-quality and uniform image data, so that the accuracy of the calculated roughness cannot be guaranteed

[0006] 2. The digital processing method of image data has not yet achieved simplicity and ease of operation, and the calculation method of high-efficiency and high-precision image feature parameters still needs to be studied

[0007] 2. There are hundreds of existing roughness calculation formulas, and the quoted parameters include more than ten kinds of roughness profile index, structural depth, undulation root mean square, etc., involving exposed concrete surfaces, new and old concrete surfaces, etc. Surface characteristics, and have achieved good applications, which shows that different structural surfaces have their uniqueness, and there are differences in the calculation formulas of roughness. At present, there is no mature calculation formula for lining surface roughness, so for When performing characterization calculations, it is based on the existing common formulas and combined with real conditions to obtain high-precision calculation formulas

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