Research On Integration Of 3D Geological Modeling Based On BIM

As a new key technology of building informatization,BIM(Building Information Model)is exerting a great influence on China's construction industry.Based on the theory of three-dimensional geological modeling and combined with BIM technology,this paper tries to carry out three-dimensional modeling of geological exploration data aiming at the present situation and the requirements of the application and realization of the 3D model of geological exploration data.In this paper,the BIM application framework of 3D geological model and the method of establishing 3D geological model of BIM is put forward,and the integration of BIM technology and 3D geological modeling theory is realized in order to explore the feasible path of applying BIM in 3D geological modeling.The main contents are as follows.(1)Based on the 3D geological modeling theory,a three-dimensional stratigraphic model is established by selecting a triangular prism-like stratigraphic simulation method.The method for judging the stratigraphic sequence is improved,the ordering method of statistical parameters of stratigraphic relations is optimized,and the treatment methods for repetitive strata and special cases are proposed.(2)Using the B-rep entity representation method of IFC standard to build a triangular prism element,SweptSolid combined with CSG method to build a quadrangular pyramid and a tetrahedron.The IFC standard extension method for 3D geological model is proposed.The IfcProxy entity is used to realize the IFC extension for the 3D geological model,and the integration of the attribute set is used to realize the integration of the 3D geological model non-geometric information.(3)Establish a feasible technical framework for constructing a 3D geological model in BIM,refer to the results of stratigraphic sequence judgment,adopt the IFC representation method of 3D geological model,based on the connection rules between the stratum demarcation points and the 3D geological transformation mechanism,and finally propose BIM-based 3D geological modeling method of technology.The method is based on the connection rule between the boreholes and the stratigraphic sequence,and treats each stratum boundary point included in the borehole from top to bottom,determines the vertex used to establish the triangular prism,and adjusts the vertex order to match The right-hand rule achieves the goal of integrating BIM technology with 3D geological modeling theory.(4)Establish BIM-GM system,realize the main frame and data structure design of the system,improve the functional modules of the system,and build the system user interface to provide selectable import file format and save format.Taking a project as an example,the practicality of the 3D geological modeling method based on BIM technology is studied,which provides an effective centralized management method for the complex information of the actual 3D geological model.