岩体结构面的表面形态直接控制着结构面的抗剪强度。为了准确地描述岩体结构面的表面形态 ,介绍了一种用来描述结构面表面形态的方法三棱锥曲面分维法。并将其应用于西南地区某水电站坝区发育的层间错动带表面形态的研究 ,并由曲面分维值计算获得了结构面的起伏角。计算结果与野外观察到的总体宏观规律吻合 ,表明利用三棱锥曲面分维法来求得结构面的表面分维 ,近而获得起伏角有一定的可信度。 The surface morphology of the rock mass structure surface directly controls the shear strength of the structure surface. In order to accurately describe the surface morphology of rock mass, a method for describing the surface morphology of the structure surface is presented. The study was applied to the study of the surface morphology of interlaminar stagnant zone developed in the dam area of ​​a hydropower station in Southwest China. The undulating angle of the structural plane was obtained from the fractal dimension of the surface. The calculated results are in good agreement with the general macroscopic laws observed in the field, indicating that the surface fractal dimension of the structural surface can be obtained by using the three-dimensional pyramid surface fractal dimension method.