A photogrammetric approach for quantifying the evolution of rock joint void geometry under varying contact states

• DOI: 10.1016/j.ijmst.2024.04.001
• Publication Date: 2024-05-11T11:42:10Z
• Authors: Rui Yong; Changshuo Wang; Nick Barton; Shigui Du
• Keywords: Void (composites)

Accurate measurement of the evolution rock joint void geometry is essential for comprehending distribution characteristics asperities responsible shear and seepage behaviors. However, existing techniques often require specialized equipment skilled operators, posing practical challenges. In this study, a cost-effective photogrammetric approach proposed. Particularly, local coordinate systems are established to facilitate alignment precise quantification relative position between two halves joint. Push/pull tests conducted on joints with varying roughness levels induce different contact states. A high-precision laser scanner serves as benchmark evaluating photogrammetry method. Despite certain deviations exist, measured generally consistent qualitative findings previous studies. The measurements yield comparable accuracy scanning, maximum errors 13.2% aperture 14.4% volume. Most matching coefficient (JMC) below 20%. Larger occur primarily in highly mismatched JMC values 0.2, but even cases where exceed 80%, error only 0.0434. Thus, proposed holds promise widespread application joints.