Borehole optical imaging technique-based RQD (rock quality designation) analysis method

Abstract

The invention discloses a borehole optical imaging technique-based RQD (rock quality designation) analysis method. The method includes the following steps that: S11, a borehole optical imaging photograph and RGB pixel values are read through an image reading function provided by Matlab; S12, image cutting is carried out, so that the image of the hole wall of the borehole can be obtained; S13, the hole wall image is converted into a grayscale image; S14, image enhancement processing is performed on the grayscale image through using a Wiener filtering method; S15, an enhanced image obtained in the step S14 is segmented; S21, edge detection and marking are performed on structural surfaces, hole gaps, corroded fissures and corroded hole parts in a segmented image obtained in the S15; S22, communicated region codes are merged according to the distribution characteristics of the structural surfaces and broken belts in the borehole image; and S23, a new communicated region range is obtained through doing statistics, and rock quality designation (RQD) calculation is carried out. With the method of the invention adopted, influences on RQD statistics caused by drilling and coring quality can be avoided.

Description

technical field [0001] The invention relates to a rock quality index analysis method, in particular to an RQD analysis method based on borehole optical imaging technology. Background technique [0002] Rock quality index (RQD) is an important parameter to evaluate the integrity of rock mass. The acquisition of RQD requires the use of a diamond drill bit with a diameter of 75 mm and a double-layer core tube to drill in the rock. Ratio of footage per round, expressed as a percentage. As an important parameter to evaluate the quality of rock mass, RQD is an important index in the Q system and RMR system of the international surrounding rock classification method, and is widely used by engineers from various countries in rock mass engineering. However, the shortcomings of the RQD acquisition method are: 1. The RQD obtained by this method is greatly affected by the drilling process, personnel quality, and construction quality, and cannot truly reflect the quality of the rock ma...

AI Technical Summary

Problems solved by technology

However, the shortcomings of the RQD acquisition method are: 1. The RQD obtained by this method is greatly affected by the drilling process, personnel quality, and construction quality, and cannot truly reflect the quality of the rock mass; 2. The RQD value obtained by this method is consistent with Drilling times have a great relationship with the same rock mass, different drilling times, the RQD value will be different, which is inconsistent with the objectivity of rock mass quality

Therefore, the borehole image obtained based on borehole imaging technology contains all the rock mass, structural plane and fracture zone information in the borehole, which also creates conditions for RQD analysis based on borehole image, but it has not yet been seen. A report on RQD analysis using digital image processing of borehole optical imaging photos

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