Determination of the Discontinuitiy Orientation Using Photogrammetric Method (Case Study:GolgoharMineNo. 1)

The purpose of this paper is to investigate the performance of photogrammetric method for determining the orientation of the discontinuities. The application of photogrammetric method for surveying discontinuities is applied as useful method. In the scanline method because of topographic constraints, disontinuities in the top part of the bench can not be measured. In addition, in this method when the angle between the discontinuities and scanline approaches to 90 degrees the discontinuities have more chance to sample. The discontinuities in a rock outcrop in the Golgohar mine No. 1 in Sirjan were sampled using the two described methods. In the scanline method, 42 discontinuities and in the photogrametric method, 258 discontinuities were sampled. In the scanline method, two joint sets and in the photogrametric method three joint sets were recognized. The two joint sets J1 and J2 are similar in the two methods showing a small difference. However, the joint set J3, which is the most critical joint set in the view of slope stability, was only sampled by the photogrametric method. Since the photogrammetric method uses many points in the plane of discontinuity, it is more precise for determining the mean orientation of discontinuities.