The morphological characteristics of core disking can reflect the in-situ stress field characteristics to a certain extent, but a quantitative description method for disking-induced fracture surfaces is needed. The fractal geometry was introduced to refine the three-dimensional characteristics of the core disking fracture surfaces, and the disking mechanism was explored through morphological characteristics. The innovative concentric-different scale method was proposed to divide the circular surfaces into square surfaces of different sizes. Furthermore, the applicability of four cubic covering methods for single fractal calculation was studied. Finally, the relative differential cubic covering method and multifractal method were used to calculate the three-dimensional data of core disking fracture surfaces in the Jinping area. The results showed that the concentric-different scale method fits the fractal dimension changing law in the exploration of different surface sizes. Using the differential cubic covering method and the relative differential cubic covering method can obtain good results for smoother surfaces. The disking was caused by tensile stress due to high crustal stress unloading, and the cracks originated from the inside of the core. Fractal theory is conducive to analyzing the morphology of rock fracture surfaces and provides guidance for exploring the failure mechanism and influencing factors.

岩心盘状形态特征可以在一定程度上反映地应力场特征，但需要一种盘状断裂面的定量描述方法。引入分形几何来细化岩心盘状断裂面的三维特征，并通过形态特征探索盘状机理。提出了创新的同心异尺度方法，将圆形表面划分为不同尺寸的方形表面。此外，还研究了四种三次覆盖方法对单分形计算的适用性。最后采用相对微分三次覆盖法和多重分形法计算了锦屏地区岩心盘状断裂面三维数据。结果表明，同心异尺度法在不同表面尺寸的探测中符合分形维数变化规律。对于较光滑的表面，使用微分三次覆盖法和相对微分三次覆盖法可以获得很好的效果。盘状现象是由于高地应力卸载造成的拉应力造成的，裂纹起源于岩心内部。分形理论有利于分析岩石断裂面的形貌，为探索破坏机理和影响因素提供指导。