A Study On Three-dimensional Geosciences Modeling And Visualization Of Engineering Rock Mass

There are structural complexity, environmental complexity and utilization complexity in engineering rock mass. This thesis aims to combine geological phenomena and engineering phenomena by three-dimensional geosciences modeling and visualization. Additionally, integration of 3D geosciences model and mechanical analysis model is discussed. Several aspects are studied, including:1. Based on analysis of original data tightly related to engineering rock mass, standard data format for topographical phenomena, geological phenomena and engineering phenomena is set up.2. After reviewing and classifying the three-dimensional data model, surface-cylinder model for engineering rock mass is set up and its geometrical feature and data structure are studied. Spatial entity is induced to point object, line object, surface object and body object in the model. Geological interface is represented by digital surface model, while slope and cavity entity are represented by cylindrical object.3. Because of the difference between the spatial property of the slope and the cavity, different cut arithmetic are adopted, algebraic operation between digital elevation model for the slope and section incision method for the cavity.4. Engineering rock mass database is set up and some functions are implemented, i.e. data input, edit, query, sortation, transformation and statistic analysis.5. By using object-oriented method and OpenGL API, three-dimensional visual system, which contains rotating, moving, zooming, rambling along appointed road and section drafting, is constructed for engineering rock mass.6. Intimate mode is adopted for the integration of three-dimensional geosciences model and two-dimensional, three-dimensional stability calculation program, while loose mode, completed by data transformation from three-dimensional regular grid to elements acceptable in FLAC 3D, is adopted for underground project.7. The application in highway slope and submarine tunnel proves validity and practicability of the system, which can be of beneficial guidance to analogous projects.