(1. College of Civil Engineering, Tongji University, Shanghai 200092, China;
2. State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China;
3. College of Civil Engineering, Qingdao University of Technology, Qingdao 266033, Shandong, China;
4. Shanghai Tunnel Engineering & Rail Transit Design and Research Institute, Shanghai 200092, China)
Abstract: To address the low efficiency of traditional geological logging and the excessive manual intervention required in numerical modeling, an integrated digital-numerical analysis method for discontinuous rock masses based on binocular vision was proposed. In this method, binocular photogrammetry, automated 3D/2D geometric Boolean operation modeling, and discontinuous deformation analysis (DDA) were integrated. By constructing a unified framework for geometric and mechanical data, an automated data workflow from on-site image acquisition and digital extraction of geological information to mechanical analysis of discrete blocks was achieved. To verify the reliability and engineering applicability of the proposed method, simulations of the progressive instability and failure processes of surrounding rocks induced by discontinuity cutting were carried out in two-dimensional and three-dimensional spaces, based on a tunnel in Southwest China and the Suocaopo Tunnel in Guizhou Province, respectively. The results showed that the exposed discontinuity information of rock masses was identified and converted into discontinuous block models for DDA simulations. Under given geometric and mechanical parameters of discontinuities, the sliding, separation, falling, and collision processes of rock blocks cut by complex joints were analyzed. An automated technical workflow for discontinuity identification, discontinuous modeling, and stability analysis of complex jointed rock masses was therefore established, by which a reference could be provided for the identification of potentially unstable blocks, rockfall risk assessment, and support design during tunnel construction.
