摘要
单轴压缩条件下花岗岩中不同细观组分的运动过程对花岗岩变形破坏过程分析具有重要意义,可以使用视频图像处理技术进行研究。根据花岗岩试件室内常规单轴压缩试验时摄取的试验视频,在提取单帧图像、进行灰度化和二值化处理基础上,得到试样中石英、长石、黑云母的实际分布,用Fourier变换指数评价这些细观组分的形状特征及其随时间的变化过程,使用粒子图像测速技术得到不同时刻、不同细观组分的位移情况,研究细观组分的运动方向、破坏顺序及其与岩石变形破坏过程的关系。结果表明,Fourier变换指数可以用于定量评价花岗岩细观组分的形状特征和细观组分形状的改变过程;在单轴受压过程中,不同细观组分发生明显变形的先后顺序是黑云母、长石、石英;细观组分的运动方向主要是垂直于加荷方向。本文研究成果对于分析岩石变形破坏机理具有一定的参考价值。
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.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2016年第8期1602-1608,共7页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(41472254
40972191)~~