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A Method Study on Data Conversion between 3-D Geological Modeling Software and Numerical Simulation Software

Three-dimensional geological modelling is a very important and hard work in the numerical simulation of engineering geology and geotechnical engineering. However, the 3D modelling capability of preprocessing of existing numerical simulation software is far less than professional CAD / CAM modelling software. Therefore, in order to enhance the 3D modelling efficiency of numerical simulation, data conversion between the CAD / CAM modelling software and numerical simulation software is often in great need. For some historical reasons, the data between CAD / CAM modelling software and numerical simulation software is not so compatible, and there are still some unsolved problems in the process of data transformation, such as incomplete information definitions, lost of topology relations after conversion and failed to identify attribute information, etc. To improve this situation, data conversion interfaces between several commonly used CAD / CAM modelling software and numerical simulation software have been studied in detail, then the shortcomings of existing common data transfer structures are discussed, and then the advantages and disadvantages of commonly used data standards are compared. Based on the STEP standards, a preliminary data conversion method applicable to the engineering geology has been suggested. It is primary method that can implement data conversion between CAD / CAM software and numerical simulation software by programming. Not only the accuracy of the geometry data exchange and the requirements for topological relations are met, but also important attribute description information is included. Finally the 3D model conversion of Xiangjiaba hydropower station is taken as an example to confirm that the model data interface development method based on the STEP standard is feasible.