Intelligent Evaluation And Real-Time Early Warning Of Safety Risks Of Offshore Tunnel Construction Based On BIM

Due to the complex construction environment of offshore tunnel,there are many hazard in the construction process,which leads to a high probability of safety accidents such as water inrush.In the process of construction safety risk management,risk assessment often relies on subjective experience and methods,resulting in weak reliability of the evaluation results.In addition,the diversity of sources and structures that affect construction safety risk factors makes the evaluation results difficult to verify,further reducing the accuracy of the results.Furthermore,risk assessment is generally conducted before the construction of the project,and on-site operators are unable to timely propose reasonable avoidance measures based on actual safety issues.In response to the above issues,this article proposes an intelligent evaluation and real-time warning of safety risks in offshore tunnel construction based on BIM,aiming to achieve standardization and standardization of safety risk management in offshore tunnel construction.The main research content and conclusions of this article are as follows:1.A DS evidence theory construction safety risk evaluation method based on confidence Hellinger distance was exploredAccording to the different information sources and structures,the fusion method is divided into image fusion method and data fusion method.By comparing and studying the advantages,disadvantages and scope of application of Bayesian statistical theory,Dempster Shafer evidence theory,artificial neural network and expert system method,DS evidence theory method is determined as a research method.For this problem,the Dempster fusion rule fails when the conflict factor K of the two chains of evidence is close to 1,and this paper uses the Hellinger distance as a method to measure the degree of conflict between the two chains of evidence.By calculating the evidence chain conflict measurement value,credibility and evidence weight,the purpose of modifying the conflict evidence is achieved,and the modified evidence chain is fused with Dempster rule to obtain multi-source heterogeneous data fusion results.2.A safety risk evaluation of offshore tunnel construction based on improved DS evidence theory is proposedIn view of the limitations of traditional construction safety risks affected by the subjectivity of experts,this paper proposes a safety risk evaluation of offshore tunnel construction based on improved DS evidence theory,and uses real-time engineering monitoring data to dynamically evaluate the safety risk of offshore tunnel construction site.Taking an undersea tunnel in Ningbo as an example,the feasibility of this method was verified.The results showed that the risk evaluation level of K7+780 of the monitoring point was level I.,the risk evaluation level of K7+860 of the monitoring point was level II.,and the rest of the monitoring points were in normal state.Based on the construction monitoring data,the dynamic safety risk level of the monitoring point is obtained through data fusion technology,which can better reflect the safety risk level of the construction site than the monitoring scattered data.3.A dynamic safety risk assessment and early warning system for offshore tunnel construction based on BIM was establishedUsing Revit as the research means and C sharp programming language under the Microsoft Visual Studio 2017.Net framework as the development environment,the "construction site real-time monitoring" plug-in based on BIM model was developed.By adding Revit UI.dll,Revit APIui.dll and references to Windows controls and their namespaces,the purpose of calling IExternal Application and IExternal Command interfaces is achieved.Use IExternal Application and IExternal Command interfaces to add the "Construction Site Real-time Monitoring" plug-in,and write an.addin file to start or close the plug-in.The "Construction Site Real-time Monitoring" plug-in contains two sub-options,"Monitoring Data" and "Changes in Various Data in the Past Week",and the functions of the two sub-options are realized by the Task Dialog.Show property.Taking the Ningbo offshore tunnel as an example,the feasibility of the system is verified.When the risk level exceeds the warning limit,the system will automatically alarm and guide the engineering personnel to deal with it.This study provides technical support for the application of monitoring information in BIM,and provides a more complete construction safety management basis for project participants.