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Development of Discontinuity Orientation Measurement (DOM) Drilling System and Core Joint Analysis Model  

조태진 (부경대학교 환경탐사공학과)
유병옥 (한국도로공사 도로연구소)
원경식 (지오텍 컨설탄트(주))
Publication Information
Tunnel and Underground Space / v.13, no.1, 2003 , pp. 33-43 More about this Journal
Abstract
Field investigations of the orientations of discontinuity planes inside the borehole for designing the underground rock structures have been depend solely on the borehole image-taking techniques. But, borehole image-taking has to be processed after the completion of drilling operation and also requires the handling of highly expensive apparatus so that practical application is very restricted. In this study Discontinuity Orientation Measurement (DOM) drilling system and discontinuity analysis model RoSA-DOM are developed to acquire the reliable information of rock structure by analyzing the characteristics of joint distribution. DOM drilling system retrieves the rock core on which the reference line of pre-fixed drilling orientation is engraved. Coordinates of three arbitrary points on the joint surface relative to the position of reference line are assessed to determine the orientation of joint plane. The position of joint plane is also allocated by calculating the location of core axis at which joint plane is intersected. Then, the formation of joint set is analyzed by utilizing the clustering algorithm. Total and set spacings are calculated by considering the borehole axis as the scanline. Engineering applicability of in-situ rock mass around the borehole is also estimated by calculating the total and regional RQDs along the borehole axis.
Keywords
DOM; RoSA-DOM; RQD; DOM; RoSA-DOM; The reference line; Drilling; Orientation; Joint position; Clustering algorithm; Spacing; RQD;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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