根据试验视频确定石灰岩中的位移场

Displacement field of limestone using video images from laboratory tests

根据室内石灰岩抗压强度试验拍摄得到的彩色视频图像与试验数据,使用数字图像相关分析技术,在对原始彩色视频图像进行可读格式转换、灰度变换、傅里叶变换基础上,利用最大相关匹配技术与小变形假设实现了石灰岩视频图像中不同位置相对位移的计算,通过循环计算得到整个石灰岩试样中的位移场与试样中各点位置的变化过程。本文方法对分析岩石变形和破坏机理具有一定的参考价值。

According to the colorful video images and experimental data from the laboratory uniaxial compression test of limestone, the displacement field was obtained in this paper. Using the digital image correlation （DIC） technique, the colorful video images were converted first into a readable format of frames, and then into the gray-scale images. A Fourier transformation and the small deformation assumption were used to match characteristics of different points in a limestone specimen. The reafter the displacement field was obtained by cycling in the global regions of the specimen. The techniques proposed herein may provide valuable information in investigating the deformation and/or failure mechanism of rocks.