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Chapter 1 Introduction 1.1 Salt caverns and application 1.1.1 Salt rock 1.1.2 Salt caverns 1.2 3D geological modeling methods 1.2.1 3D GIS and 3D geological modeling 1.2.2 Attribute-oriented information expression 1.2.3 Subdivision surface modeling technology 1.3 Application of 3D geological models 1.3.1 The development of spatial indexing structures 1.3.2 3D geological platforms and software Chapter 2 Geological data management and processing 2.1 Drill data management and processing 2.2 Sonar logging data management and processing 2.3 Multi-source database for 3D geological modeling 2.3.1 Geodatabase data mode 2.3.2 Quality control method of urban engineering Chapter 3 Key technologies of 3D geological modeling 3.1 Review of intersection detection methods 3.2 The fast intersection detection method 3.2.1 Related concepts and spatial scanning strategies 3.2.2 Space Sweep algorithm description 3.2.3 Experiment and analysis 3.3 Boolean operation methods 3.4 3D mesh generation methods 3.5 Mesh subdivision of 3D spatial models 3.5.1 The concept of subdivision virtual drills 3.5.2 The realization principle of subdivision virtual drills 3.5.3 3D geological models based on subdivision virtual drills 3.5.4 The case study of subdivision virtual drills Chapter 4 3D geological modeling of salt caverns and wall rocks 4.1 3D salt stratum modeling 4.2 3D salt cavern modeling 4.2.1 Data structure of 3D surface topological reconstruction of caverns 4.2.2 3D surface topological reconstruction of salt caverns 4.2.3 The validity checking of 3D surface model of salt caverns 4.3 3D surface modeling of the wall rock of salt caverns 4.4 3D voxel modeling of the wall rock of salt caverns 4.4.1 Tetrahedral mesh generation technique 4.4.2 A direct volume rendering method Chapter 5 Management and application of 3D geological models for wall rock of salt caverns 5.1 A hybrid spatial indexing structure based on Octree and 3D R-tree 5.1.1 Experimental design 5.1.2 The new GTM-oriented hybrid spatial indexing structure 5.1.3 Validation 5.1.4 Results and discussion 5.2 A hybrid spatial indexing--3D RR-Tree 5.2.1 3D index tree construction algorithm of the underground entity 5.2.2 3D RR-Tree properties 5.2.3 3D RR-Tree performance analysis 5.3 The analysis and application platform of 3D geological modeling of salt rock 5.3.1 Design of system function structure 5.3.2 Conclusion 5.4 3D computing model of wall rock of salt caverns 5.4.1 Spatial data structure 5.4.2 Case study and analysis 5.4.3 Conclusion References