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通过对现有损伤参量的定义方法的分析,尝试采用分形维数作为表征岩石损伤的参量,建立分形维数与损伤程度的相对关系。根据盒维数算法思想及数字图像存储原理,编写了基于Matlab的数字图像的简易盒维数算法。结合实际工程爆破施工,采用数字式全景钻孔摄像系统进行了现场测试。通过对实测的爆前、爆后岩体的影像资料进行裂纹提取及图形处理,得到了爆破前后岩体损伤裂纹对应的分形维数,确定了爆破作用下所产生的损伤增量。结果表明,用分形维数来描述岩石的损伤,克服了其他定义方法涉及过多岩石特性参数的不便,其结果为研究岩石的损伤程度及演化过程,探索了一条新的途径。
Through the analysis of the definition of the existing damage parameters, the fractal dimension is taken as the parameter to characterize the rock damage, and the relative relationship between the fractal dimension and the degree of damage is established. According to box dimension arithmetic idea and digital image storage principle, a simple box dimension algorithm of digital image based on Matlab is compiled. Combined with the actual engineering blasting construction, the digital panoramic borehole camera system was used for on-site testing. The fractal dimension of rock mass damage crack before and after blasting is obtained through the crack extraction and graphic processing of the measured blasting and post-explosion rock mass image data, and the increment of damage caused by blasting is determined. The results show that fractal dimension can be used to describe the damage of rock and overcome the inconvenience of other definition methods involving too much rock characteristic parameters. The results have explored a new way to study the damage degree and evolution process of rock.