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岩石节理的粗糙度对结构面的剪切强度起着重要的作用。分形维数对节理的次级细微粗糙结构能够进行很好的描述,而对节理的一级起伏结构体现并不明显。考虑了节理形态的层次性,用分形维数代表节理的次级精细结构,即节理的粗糙度;用起伏度表示节理的一级波状形态,据此提出用分形维数D和起伏度Wd两个指标来描述JRC(节理粗糙度系数),并给出相应的计算公式。另外,针对工程实践中分形维数准确快速量测存在的困难,本文以摄影测量为基础,借助数字图像处理技术,在VC++平台下开发了节理轮廓线分形维数计算程序,为分维较准确方便地应用于工程实践做了有益的探索。
The roughness of rock joints plays an important role in the shear strength of the structural plane. The fractal dimension can describe the subfamily fine sub-structure of the joint well, but it is not obvious to the first order undulating structure of the joint. Considering the hierarchy of the joint shape, the fractal dimension is used to represent the secondary fine structure of the joint, that is, the roughness of the joint. The undulating dimension is used to represent the first-order wavy shape of the joint. It is proposed that the fractal dimension D and the waviness Wd An index to describe the JRC (joint roughness coefficient), and gives the corresponding formula. In addition, aiming at the difficulty of accurate and rapid measurement of fractal dimension in engineering practice, this paper, based on photogrammetry, uses digital image processing technology to develop the calculation program of the fractal dimension of joint contour in VC ++ platform, Conveniently used in engineering practice to do a useful exploration.