三轴压缩煤岩三维裂隙CT图像重构及体分形维研究

通过对煤岩试件进行常规三轴力学试验,并对破坏后的煤岩试件进行CT扫描,之后将处理过的CT图片导入Mimics10.01进行三维重构,得到了煤岩试件内部裂隙空间的分布情况。另外,利用自编的Matlab程序对煤岩试件的体分形维进行了初步分析。结果表明:煤岩试件在三轴加载条件下主要发生压剪破坏;且围压不同,煤岩试件表现出了特定的力学规律;利用Mimics10.01重构得到的煤岩三维裂隙空间分布情况显示,随着围压的增大,煤岩试件剪切破坏面的连通率和体密度有增大的趋势;体分形维计算的结果显示,煤岩内部破坏越严重,体分形维值越小。

CT image reconstruction of coal rock three-dimensional fractures and body fractal dimension under triaxial compression test

The conventional triaxial compression test is conducted on coal specimens, then the destroyed coal specimens are taken to perform CT scanning test, and thus the spatial distributions of fracture within the coal specimens are obtained by importing processed CT images into Mimics10.01. In addition, the body fractal dimension of coal specimens is preliminarily analyzed by self-compiled Matlab program. The results show that under triaxial compression condition, compression and shear failures prevail in coal specimens, and coal specimens exhibit a specific mechanical mechanism with varying confining pressure. The spatial distribution of coal three-dimensional fractures reconstructed by Mimics10.01 indicates that the connectivity rate and bulk density of shear failure plane of coal specimens tend to increase with the confining pressure. And the calculated results of body fractal dimension suggest that the more serious damage inside coal rock, the lower the fractal dimension value.