Evaluation of open-pit rock slope stability using coupled UAV terrain following and close-range photogrammetry

ZHANG Zongying

doi:10.13235/j.cnki.ltcm.20250285

Abstract：To address issues such as texture distortion,shadow occlusion,and insufficient accuracy in traditional oblique photogrammetry for complex steep slope terrains,the article proposes a technical approach combining terrain-followingoblique photography with multi-angle close-rangephotography to construct high-precision 3D models,aiming to provide a data foundation for high-accuracy structural plane identification and block stability analysis.The specific approach involves building a low-resolution base model using conventional oblique photogrammetry,followed by terrain-followingoblique photography to systematically capture topographic features and structural plane geometric parameters in open-pit mine steep slope areas.Based on the spatial distribution patterns of structural planes,a principal orthogonal shooting scheme supplemented by multi-directional angles significantly enhances rock mass image clarity and interpretability.The results show that this method successfully constructs millimeter-level precision 3D real-world models,effectively eliminates texture distortion and shadow occlusion,and enables accurate acquisition of key parameters such as structural plane orientation,trace length,and aperture,achieving effective identification and stability evaluation of potentially hazardous blocks,and significantly improving the credibility and reliability of geological hazard analysis for high-steep rock slopes in open-pit mines.