Journal of the Korean Society of Mineral and Energy Resources Engineers ISSN:2288-0291(Print) 2288-2790(Online) 한국자원공학회지

In this study, images of borehole wall were captured to get the joint traces revealed on the borehole wall using borehole scanner, BIPS, and the characteristics of joints were interpreted by applying image processing techniques. The targets included in this study were orientations, pole concentrations and roughness coefficients of joints or joint sets and their normal and shear stiffnesses using Barton-Bandis model. To verify the results from borehole wall image, measurement of JRC for the actual joint surface in the core and joint shear test were executed and compared with those from image processing. Comparing JRCs and stiffnesses from both cases, JRCs of about 81% of 94 measurements were coincided fairly well and the stiffnesses estimated using Barton-Bandis model could be determined to be acceptable considering experiment condition. As a general result of this study, joint map including characteristics of joint set was produced for utilization to rock mass numerical modeling.