基于试验视频图像的花岗岩细观组分运动过程研究

doi:10.13722/j.cnki.jrme.2015.1066

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Abstract The analysis of the movements of various meso-compositions of granite specimen is of great significance in exploring the deformation/failure process of rock material and can be performed using the video image processing techniques. In the current study，the video images were photographed during the laboratory axial compression test. The frame images were extracted from the original video recordings and transformed into the grayscale and binary ones. The actual distributions of the quartz，feldspar，and biotite existed on the specimen were pin-pointed according to the image features of the corresponding compositions. The Fourier transform based shape indices were then used to describe the geometry features and to examine the changes of the indices with time. The particle image velocimetry technique was thereafter used to compute the displacements of various meso-compositions at different times. The relations between the deformation/failure of the specimen and the movement directions/sequences of the meso-compositions were also explored. It shows that Fourier indices may effectively quantify the shape characteristics and their changes of meso-materials on the granite specimen. During the axial compression，the failure of the meso-compositions in the granite specimen were in sequence of biotite，feldspar，and quartz. The components perpendicular to the axial load were the principal parts of the displacements in these minerals.

Key words： rock mechanics granite video image meso-composition movement Fourier transform

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	LIU Fang1
	2
	XU Jinming1

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LIU Fang1,2,XU Jinming1. An investigation on movements of meso-compositions of granite specimen using video image processing[J]. , 2016, 35(8): 1602-1608.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2015.1066 OR http://www.rockmech.org/EN/Y2016/V35/I8/1602

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