Method for water-containing homogeneity detection and diffusion coefficient calculation of rock sample based on digital image

Abstract

The invention belongs to the field of mechanics of rock flow through porous media, and relates to a method for water-containing homogeneity detection and diffusion coefficient calculation of rock sample based on a digital image. The method includes steps of (1), collecting a rock sample of a target rock zone, and preparing a rock sample and red ink solution for a steeping test; (2), acquiring an image of sample surface chromatic aberration during the humidity diffusion process; (3), identifying and extracting color grey value of a rock sample; (4), calculating the variance of the grey value ofthe rock cross section pixel; (5), performing regressive analysis on the grey value of the rock cross section pixel and the selected rock water content; (6), building up a numerical value model applicable to the diffusion of the rock humidity by means of the diffusion position data in the humidity diffusion test, and inverting the diffusion coefficient. Through the water containing homogeneity detection of the rock sample, an image identifying procedure applicable to the water containing distribution image of the rock sample is compiled, and exact input parameter is provided for the varianceof the calculated image grey value, thereby improving the forecasting precision of the water containing homogeneity.

Description

technical field [0001] The invention belongs to the field of rock seepage mechanics, and relates to a method for detecting the water content uniformity of rock specimens and calculating the diffusion coefficient based on digital images. technical background [0002] Among the many risk factors in mining engineering, water inrush is undoubtedly one of the most important factors. Water inrush will seriously affect the progress of the project, increase the cost of the project, and even cause catastrophic consequences such as equipment damage and casualties. Determining the hidden danger of water inrush in the mining process has become the primary task of safe mining for enterprises. Therefore, studying the distribution of water content in rock formations and testing the uniformity of water content in rocks are very important for evaluating the stability of underground excavation space and designing permanent support for underground rock engineering. protection has important th...

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Problems solved by technology

[0005] In view of the existing laboratory research on the influence of water on the mechanical properties of rock, the main method is to calculate the quality of water intruded into the rock through soaking tests. This method cannot describe the distribution of water in the rock test piece. The p

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