Study On Construction Information Management And Collapse Risk Evaluation Method Of Mountain Tunnel Based On BIM

After more than 40 years of rapid development since the reform and development of China’s expressway mountain tunnel engineering,the construction technology has reached a certain height,the focus gradually from survey and design,construction technology to risk assessment and management.Disaster induction during tunnel construction is related to many risk factors,such as surrounding rock properties,excavation methods,support forms,etc.Due to the complexity of rock and soil mass and multi-source heterogeneity of information in tunnel engineering,it is difficult to obtain the parameters of tunnel risk factors,and there are many uncertainties in risk assessment.Secondly,as the numerical simulation method is increasingly used for risk assessment in tunnel engineering,how to determine model parameters is the most important step,and the accuracy of parameter values of numerical modeling will affect the results of risk assessment.In the whole life cycle of mountain tunnel engineering from survey to design to construction to operation and maintenance,it is inevitable that a large amount of information data will be generated.How to store and manage these data efficiently to provide strong data support for risk assessment needs further study.Any field needs to learn favorable factors from other fields to promote its own development.BIM(building information model)technology originating in the field of construction is worthy of reference in the field of risk assessment and management of tunnel engineering,and can also effectively improve the informatization level of mountain tunnel construction.Therefore,based on Autodesk Revit software platform,this paper proposes a tunnel collapse risk assessment system and combines BIM technology to carry out research on tunnel parametric modeling,construction information management and risk visualization management methods,and applies them to Yanglin tunnel.The main research contents are as follows:(1)In view of the current situation that the parameterization ability of existing tunnel modeling methods is insufficient,the structural characteristics of mountain tunnel are analyzed,the visual programming technology is used for secondary development,and the BIM parameterization modeling method of mountain tunnel is proposed.Develop tunnel parametric modeling and construction information management program to realize parametric drive modeling of tunnel model components such as primary support,secondary lining,waterproof plate,side ditch,road surface,invert filling,cover plate,steel arch,anchor,monitoring device,etc.Realize parametric design,mass modeling and batch processing of model information in the whole process of tunnel from route creation to 2D profile generation to 3D entity generation.(2)In order to make up for the lack of geological modeling ability in BIM environment,the development program module based on borehole investigation information is used for the rapid construction of three-dimensional geological model.The integrated application of tunnel3 D model and geological model is completed to realize the fusion of multi-source heterogeneous information such as geological parameters,hydrological parameters,construction parameters,support parameters and monitoring data during construction.(3)Study for BIM model information interaction of IFC(industrial base class)in the field of standards in the field of tunnel and the geological entity expression method,extending the original IFC data standard of spatial entity and the physical elements,to express mountain tunnel construction through the custom attribute set professional information and geological information,based on the IFC standard system of mountain tunnel data,Realize information interaction between BIM models.(4)Based on the tunnel collapse risk assessment index,a collapse risk assessment model of mountain tunnel during construction period based on analytic hierarchy process + ideal point method is established.Based on the analysis of a large number of tunnel collapse cases,the events that may cause tunnel collapse are systematically classified based on the work decomposition structure-risk decomposition structure method.Starting from the analysis of the main influencing factors of tunnel collapse,the risk identification of mountain tunnel construction period is completed.The risk indexes of geological and hydrological conditions and construction factors are selected to carry out the primary and secondary static risk assessment respectively.At the same time,the dynamic risk assessment is carried out based on the dynamic feedback information of monitoring measurement,and the classification standard of tunnel collapse risk grade is given.(5)Develop tunnel construction collapse risk assessment module based on building information model.Through the three-dimensional model into finite element model and the method realizes the BIM information model and numerical model of interaction,to obtain monitoring data,the data of investigation in the module based on engineering example input in each risk index score can be directly according to the proposed risk assessment model to calculate the risk probability of collapse and complete visual management risk,It is applied to yanglin tunnel project,and the evaluation result accords with the actual situation.