The Research On BIM-based Subway Foundation Pit Monitoring Information Management

Subway Foundation Pit is the focus of the subway construction safety management,Information-based construction is the mainstream strategy for Foundation pit risk control.Monitoring information management is the middle stages from engineering monitoring to information-based construction.Orthodox monitoring information management relied on graphic reports,which might meet bottleneck in large-scale monitoring information management.With features including digitization,visualization and simulation,Building Information Model(BIM)can do better in large-scale complex engineering information managing.Using BIM and BIM-related technologies in the process of subway deep foundation pits monitoring information management,can provide better supports for Information-based construction.The main work and contents of this paper include:(1)Proposed conceptual framework for BIM-based Subway foundation pits monitoring information management,indicated two core strategies are BIM-based engineering information integration management and BIM-based monitoring information visualization,And the conditions include basic BIM models,standardized monitoring data,and the method of Correlated integration of BIM model and monitoring data.Analyzed different technology paths,considering feasibility and potential replication,selected the technical route based on mainstream BIM commercial software Revit,and function tools developed by Dynamo.(2)Oriented to an practical subway station project,designed the BIM-based monitoring information management scheme through model annotation and color annotation.Developed monitoring information model annotation module and monitoring information color labeling module with Dynamo,accomplished the correlation channel between the monitoring data table and the model through model annotation module,and visualize the monitoring risk information by the color labeling module.Experimented the scheme by practical case,established the engineering basic BIM model,and tested the function modules on the model,the results show functional reliability of the modules,and verified the feasibility of BIM-based foundation pit monitoring information management based on model annotation and color labeling.(3)Aimed at the problem of the expression of local monitoring data to theoverall model,developed a monitoring data grid analysis tool,designed the information transfer logic with distance as the main parameter,transmitted the partial monitoring information to all grid units,realized the extension of the monitoring data.Developed the model parametric coloring tool,which can assign grid units corresponding color according to the parameter value,realized the model parametric color visualization.Tested function by particular shield end well foundation pit's horizontal displacement monitoring data,proved the practicability of this scheme.