Digital image-based method, system and device for identifying microcracks inside rock core

Abstract

The invention belongs to the field of rock characteristic analysis, and particularly relates to a digital image-based method, system and device for identifying microcracks inside a rock core, aiming at solving the problem that the microcracks inside the rock core cannot be identified. The method comprises the following steps: acquiring a first rock sample, acquiring an initial slice sequence through CT scanning, and acquiring reference image points of each initial slice in the initial slice sequence; performing a fracturing test on the first rock sample based on a triaxial pressurization device, and acquiring each process slice sequence corresponding to the initial slice sequence under different loading strengths through CT scanning; based on a local area image matching method, acquiring corresponding points of reference image points in each process slice to obtain a first displacement field of each process slice; and acquiring a matching map point after sub-pixel positioning based onthe first displacement field of each process slice, acquiring a second displacement field, and extracting microcracks after rock deformation damage. The digital image-based method, system and device for identifying microcracks inside the rock core effectively improves the identification precision of the crack and is beneficial to simulating the expansion and the evolution of the rock crack.

Description

technical field [0001] The invention belongs to the field of rock characteristic analysis, and in particular relates to a method, system and device for identifying micro-cracks inside rock cores based on digital images. Background technique [0002] The propagation and distribution of cracks, as well as the morphological characteristics of cracks are an integral part of studying the failure characteristics of rocks. At present, there are two methods to detect the distribution of rock cracks: one is based on the observation of rock surface cracks, and the other is to obtain the internal crack distribution of rocks by means of CT scanning. The second method can obtain the internal deformation and failure of the rock, but due to the limitation of the equipment hardware, it can only identify cracks whose width is higher than the resolution size of the equipment. Currently, high-energy accelerator CT can obtain cracks inside rocks. During the dynamic scanning triaxial pressuriz...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the above-mentioned problems in the prior art, that is, in order to solve the problem that the micro-cracks inside the rock core cannot be identified, the first aspect of the present invention proposes a method for identifying micro-cracks inside the rock core based on digital images, including:

Images