Study On BIM And Information Resources Management Based On Muti-source Data Fusion Method

Transportation infrastructure investment continues to run at a high level,and transportation network is accelerated and improved.BIM as an information technology steadily promotes the construction of transportation infrastructure information technology.However,there are problems such as non-uniform data standards,difficult business data integration,difficult multisource heterogeneous data fusion,industry management software with single function,inefficient information delivery,and life-cycle information fragmentation,which lead to inefficient sharing and utilization of information resources among participants.These problems make it difficult to meet the high standards of transportation infrastructure construction and results in redundancy and waste of information resources.In order to realize the efficient use of information resources,With the goal of life-cycle management of information resources,the BIM model as information carrier and the SOA was adopted in this thesis.Having Integrated3 D scene information and transportation infrastructure construction process information,the thesis builds the general framework and system structure of BIM information resource management,carries out key technologies such as BIM-based information resource integration standard,multi-scale multi-source heterogeneous model fusion technology,etc.The research has developed a BIM-based information resource management system and carried out practical application verification in combination with trunk highway tunnel projects.The specific research contents and innovative results are as follows:Firstly,this paper puts forward the requirements of transportation infrastructure information resource management around multiple dimensions such as data,architecture,security and expansion performance,according to the characteristics of transportation infrastructure information resource management.The overall scheme of information resource management based on service-oriented architecture is designed.The general architecture establishes three types of data structures and storage methods containing model data,attribute data and real-time data.Based on above architecture,12 sub-modules of BIM information management platform covering two phases of construction,operation and maintenance and considering three dimensions of participants,business process and information flow,which can enhance the value of BIM application from the perspective of information utilization efficiency.Secondly,in order to organizing transportation infrastructure information model data,a multi-scale 3D model construction method is proposed.The method uses IFC standards to build a parametric construction process and multi-detail level integration of 3D tunnel model,realizing the mapping of different division levels such as tunnel design line,tunnel profile,tunnel internal structure and multi-detail level,further realizing the consistent update of geometric and attribute information.According to the 3 dimensions of participants,business process,information flow,information resources for the whole life cycle of transportation infrastructure project are identified and screened,and then the IFC standard information is extended based on object-oriented methods to realize the standardized expression of drawings and record information.The attribute-model separation storage method of IFC model is proposed.IFC entity type discrimination algorithm is designed to extract attribute.and the mapping relationship between database forms and component attributes is constructed to store the attribute data.The bi-directional links between IFC model,attributes and non-geometric information are created by unique encoding of BIM components,which can realize fast storage,extraction and expansion of model,attribute and document.Then,to address the problems of coordinates inconsistency and lack of semantic information in the process of multi-source heterogeneous spatial model data fusion and integration,this paper proposes a spatial data integration method between BIM and GIS based on semantic mapping,spatial coordinates matching,data parsing and reconstruction through the comparison and analysis between semantic and geometric descriptions of IFC and City GML,and verifies the accuracy and lightness of spatial coordinates matching in the application examples of the method.Focusing on the technical problems of multi-source heterogeneous data integration of transportation infrastructure,the matching method between BIM model,tilt photography and terrain is investigated.In details,the operations of cropping and mosaic on tilt photography,terrain are used to achieve the integration and consistency expression between BIM model,tilt photography and terrain.By merging tilt photography root node and constructing quadtree spatial index and multi-level detail model,the fusion of spatio-temporal multidimensional data,light loading of models,dynamic rendering on the web side and multiscale applications were realized.Finally,the tunnel BIM construction management platform architecture design is realized based on service-oriented architecture.Taking engineering metrology as an example,tunnel construction management data storage standard,service interface definition and REST request format are described.Using multi-source heterogeneous model data integration and fusion and cloud rendering technology,the space-time integration map of digital twin platform is built,which provide a visualization environment for information resource utilization.For BIM component information management,professional component coding rules according to the structural decomposition mode and spatial location of open-cut tunnel are developed,which is the key of integration multi-source data integration and attribute inheritance and unstructured data.On the basis of all above components,attributes and files can be viewed and called interactively.With the digital twin platform map as the visualization tool,the BIM model as the carrier,and constructing a closed loop of information flow through business processes,the tunnel BIM construction management platform and operation and maintenance management platform are developed to realize the integration,management and application of tunnel project information resources.