Rough surface crack generation method based on digital image technology and test system

Abstract

The invention provides a rough surface crack generation method based on a digital image technology and a test system, and relates to the technical field of rock mechanics tests. The method comprises the following steps: A. loading a rock test piece, forming a through crack in the test piece, and removing debris on the surface of the test piece; B, scanning the surface of the rough crack by a scanner to obtain a digital image of the surface of the rough crack; C, processing the digital image, including noise removal processing and threshold segmentation processing; D, performing normalization processing on the RGB value of the digital image to obtain a normalization matrix, establishing a space coordinate system, and obtaining an image digital matrix reduction proportion; E, calculating a digital reduction matrix; F, completing simulation of cracks of the rough surface, and restoring complete space cracks. The test system comprises a shell, a stand column, a telescopic oil cylinder array, a control system and a hydraulic loop. The invention provides a method for researching rock rough fracture seepage physical and mechanical rules. The method accurately describes a rough structure of a rock fracture.

Description

technical field [0001] The invention relates to the technical field of rock mechanics tests, in particular to a method for generating cracks on rough surfaces based on digital image technology and a test system for simulating cracks on rough surfaces. Background technique [0002] The natural fracture structure and seepage behavior of rock mass are extremely complex, and the seepage mechanism and quantitative description of rock mass fractures have always been a difficult problem of great concern in geotechnical, mining, geology, petroleum and natural gas engineering, and the joints and cracks in rock mass are the source of groundwater As the main channel of seepage, the surface roughness of rock mass fissures has a great influence on groundwater seepage. The cracks in natural rock mass have been affected by complex geological processes for a long time, and the roughness of the surface varies widely. It is difficult to intuitively characterize the roughness of the rock mass ...

AI Technical Summary

Problems solved by technology

[0004] Most of the existing natural rock rough fracture surface simulations use resin materials to replicate rock surface features, and use similar materials to reconstruct the fracture surface. This method cannot avoid the interference of uncertain factors in the test on fracture reconstruction, and the flow In the solid coupling test, different tests cannot be carried out on two specimens with the same fracture condition, and the hydraulic opening of the joint surface cannot be accurately obtained. There is a lack of necessary research methods for studying the fluid-solid coupling of fractured rock mass from the mesoscopic scale. and test methods; for this reason, further improvements to existing test methods and test systems are required

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