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岩体结构面表面形貌的各向异性是岩体结构面的力学、渗流及其耦合性质存在各向异性的主要因素。采用人工劈裂方法制备了4个花岗岩结构面,在精确测试其表面形貌并进行数值化表达的基础上,截取二维表面轮廓线并对其几何组成进行分析,将二维表面轮廓线分为非稳态倾向、稳态一阶起伏度、稳态二阶粗糙度3个几何组成部分,并由此提出了二维表面轮廓线的3参数描述系统。基于小波分析,实现了对稳态一阶起伏度与稳态二阶粗糙度的分离。在上述基础上,对岩体结构面表面形貌的各向异性特征进行了系统深入的研究。研究表明,非稳态倾向与稳态一阶起伏度具有明显的各向异性特征;而稳态二阶粗糙度则可视为各向同性,对于岩性相同的结构面,稳态二阶粗糙度的描述参数值大多分布在某一长度较小的区间内。
The anisotropy of surface topography of rock mass is the main factor of the anisotropy of mechanics, seepage and coupling properties of rock mass structural plane. Four granite structural surfaces were prepared by artificial splitting method. On the basis of accurate testing of the surface morphology and numerical expression, the two-dimensional surface contour lines were intercepted and analyzed. The two-dimensional surface contour lines It is the non-steady-state tendency, the first-order undulating steady-state and the second-order steady-state third-order geometric components, and the three-parameter description system of two-dimensional surface contour is proposed. Based on wavelet analysis, the separation of steady first-order undulation and steady-state second-order roughness is achieved. On the basis of the above, the anisotropy characteristics of the surface topography of rock mass are systematically and deeply studied. The results show that the non-steady-state tendency and the first-order undulating degree have obvious anisotropy characteristics, while the steady-state second-order roughness can be regarded as isotropic. For the same lithological structural plane, the steady second-order roughness The values of the descriptive parameters are mostly distributed in a smaller interval.