In the field of intelligent mine construction, the swift, accurate, and automated generation of three-dimensional roadway models remains a formidable challenge. The complex spatial interconnections inherent in roadways necessitate effective automatic segmentation and linkage at spatial intersections to address this issue. Conventional approaches frequently depend on substantial manual adjustments at roadway intersections, which are not only time-consuming and labor-intensive but also susceptible to inconsistencies in model accuracy. To mitigate these limitations, this study introduces an automatic method for spatial intersection segmentation and connection of roadways, based on a hierarchical processing framework. This framework amalgamates Axis-Aligned Bounding Box (AABB) pre-screening (coarse screening phase), constrained Delaunay triangulation (refinement phase), and tolerance mechanisms (error correction phase) to establish a cohesive “coarse-refine-correct” workflow, thereby markedly enhancing the stability and efficiency of processing intricate 3D roadway intersections. The methodology is structured as follows: initially, potential intersecting triangular meshes are swiftly identified through AABB intersection detection. Subsequently, precise intersection calculations are conducted on the detected meshes to generate closed intersection lines. These lines are then integrated into the roadway’s triangular mesh network, and constrained Delaunay triangulation is employed to reconstruct the local topology of intersecting regions. By utilizing intersecting polygons, the original mesh is partitioned into multiple sub-regions. Sub-meshes located within the original mesh are identified and removed, while the remaining sub-meshes are amalgamated to create a seamless, interconnected roadway structure. This methodology facilitates the construction of high-precision and reliable 3D roadway models, significantly reducing the need for manual intervention and enhancing modeling efficiency. Validation using a real-world mine roadway model demonstrated the method’s efficacy: 63 spatial intersections (comprising 58 roadway junctions and 5 crossings) were automatically processed, achieving 100% intersection line closure and a topological error rate of less than 2%. These findings confirm the method’s capability to address complex 3D roadway modeling scenarios, offering a robust solution for intelligent mine planning and digital twin applications.
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