摘要
为了获得泥页岩盖层在荷载作用下裂纹的演化规律,采用高分辨率工业CT实时成像系统对单轴压缩试验条件下的页岩试样进行了扫描.利用图像处理技术对不同荷载水平的CT扫描图像进行了处理,获得灰度平均值、孔隙率以及孔隙和裂纹三维重建坐标.在此基础上,对页岩的损伤变量、灰度图的分形维数以及孔隙和裂纹3D重建进行了研究.结果表明:由损伤变量、孔隙率及分维数随荷载水平变化曲线规律可得,泥页岩裂纹演化可以分为4个阶段,即压密阶段—裂纹萌生阶段—裂纹发展阶段—裂纹贯通破坏阶段;同时对不同荷载水平作用下的裂纹进行了孔隙和裂纹三维重建,从三维角度直观地观察分析裂纹开展与演化的全过程,该方法为我们分析裂纹的损伤演化提供了一条新的思路.
In order to obtain the crack evolution law of clay shale cap rock under loading,clay shale specimen under uniaxial compression state was scanned with the real-time Imaging system with high resolution industry computerized tomography.Grayscale-averaged value and threedimensional coordinates to realize 3Dreconstruction of porosities and cracks were obtained by processing CT images of clay shale under different load levels with image technology.On this basis,studies on the damage evolution of clay shale,the fractal dimension of gray-scale image and3 Dreconstruction of porosities and cracks were carried out.These results indicated that crack evolution of clay shale can be divided into four stages from the relation curves of the damage variable calculated and the porosity and fractal dimension under the load levels：the compaction stage,the crack initiation stage and crack development stage,crack failure stage.At the same time we can directly observe and analyze the whole process of crack spreading and evolution from three-dimensional perspective through 3Dreconstruction of porosities and cracks under each load levels.The method provides a new way for us to analyze the evolution of crack damage.
出处
《浙江工业大学学报》
CAS
北大核心
2015年第1期66-72,共7页
Journal of Zhejiang University of Technology
基金
国家自然科学基金资助项目(51234004
41272297)
四川省科技支撑计划项目和国际合作项目(2013GZ0071
2014HH0007)
关键词
泥页岩
CT图像处理
裂纹演化
分形维数
三维重建
clay shale
CT image processing
crack evolution
fractal dimension
3D reconstruction
