基于修正线粗糙度法的岩石节理粗糙度估值

考虑了节理形态的层次性，提出了用修正的线粗糙度法表征节理轮廓线粗糙度（JRC），即用节理轮廓线的起伏度表示节理的一级波状形态，用伸长率代表节理的次级精细结构。通过对Barton给出的10条典型节理轮廓线的特征参数计算，并与相应的JRC值进行回归分析，给出了JRC值计算公式。另外，要获得节理轮廓线的伸长率，节理全迹长是一个很重要的参数。在工程实践中，针对全迹长量测存在的困难，研究以摄影测量为基础，借助数字图像处理技术，在VC⁺⁺平台下开发了节理轮廓线特征参数计算程序，实现了节理全迹长的快速量测，并对该方法在工程实践中的方便应用做了有益的探索。

Estimation of Rock Joint Roughness Based on Modified Line-Roughness

Based on the asperity of a rough joint occurring on many scales，Joint roughness coefficient (JRC) is presented using the elongation rate (Er) and degree of the undulation(wd），and their relationship is established through the value of standard profiles suggested by ISRM. The elongation rate (Er) is used to show the roughness character offered by secondary asperity，while the degree of an undulation (wd) is used to reflect the roughness property at the first order. On the other hand，in virtue of the difficulties in calculating the value of curve length in engineering practice，this paper provides the program for obtaining the value of curve length based on the digital image of rock joints. It would be helpful for applying the method to describe the JRC in engineering practices.