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A Comparison between the Core Orienter and the Borehole Impression Device

Abstract The core orienter and the borehole impression device have both been used for the orientation of discontinuities in boreholes during the site investigation for a large site formation project in weathered granitic rock in Hong Kong. The borehole impression device was found to have a number of advantages over the core orienter as it gave a more detailed picture of the discontinuity characteristics, it provided a permanent record, and was more cost effective. Core orientation techniques are recommended in areas where there is insufficient exposure of bedrock at the surface to carry out surface outcrop logging.