Evaluation of surface roughness of rock-like joints using close range photogrammetry method

Abstract The surface roughness of the joints affects their hydraulic and mechanical behavior. There are various methods for assessing discontinuities. With development photography technology release powerful software, a photogrammetric analyzer has been introduced as non-contact evaluation method. In this research, three-dimensional model fracture was constructed using close-range procedure joint coefficient (JRC) is derived from profiles. Also, profiles were surveyed Profilometers (Barton Comb) JRC values obtained Z 2 Calculations performed in two sampling steps 0.42 1.27 mm. Ultimately, results compared. A Sony Cybershot HX1 digital camera used to capture images. To process images build 3D model, they loaded “Agisoft metashape” software. point cloud data with very high accuracy distance 0.13 mm between points model. show that photogrammetry method, upper joint, recorded 8% 11% difference intervals mm, respectively. While bottom these differences 6.1% 10%