Study On Construction Permit Evaluation Of Mountain Tunnel Based On BIM

In recent years,with the rapid development of my country’s social economy,investment in the field of infrastructure has continued to increase,and the field of tunnel engineering has also developed rapidly.Most of the tunnels are built in the mountains,are linearly distributed,and are deeply buried underground,and are relatively concealed.It is difficult to accurately reveal the geological conditions of the tunnel through the limited drilling in the survey and design stage.At the same time,the pregnancy risk environment and hazard factors of tunnel construction are complex and changeable,and there are many potential risk factors;the existing construction permit evaluation work is also in the exploratory stage,and the accuracy of the results is relatively low,the reliability is poor,and it is difficult to meet the construction requirements.Safety requirements;coupled with the constraints of various subjective and objective factors,the geological advance forecast results during tunnel construction failed to effectively guide tunnel construction,resulting in frequent occurrence of disasters such as collapse,mud outburst,and water gushing during tunnel construction.Therefore,it is necessary to explore a tunnel construction permit mechanism based on BIM and real-time advanced geological forecast in order to achieve efficient,real-time and dynamic risk control and early warning.In response to the above problems,this article takes the actual project of Wenbishan Tunnel as an example to carry out related research on tunnel construction information and construction permit mechanism.First,based on traditional two-dimensional drawings and related text reports,a three-dimensional BIM macroscopic and rough model of the tunnel structure and its geological conditions was established;then,during the tunnel excavation process,based on the tunnel’s advanced geological prediction results,the typical structural planes and faults,Geological structure and other information are introduced into the aforementioned macro and rough geological BIM model to realize real-time dynamic update,correction and fine modeling of the geological model;finally,based on the fine geological model and the proposed tunnel construction method,excavation technology,support The quantitative evaluation of tunnel construction permits was carried out for factors such as protection parameters,to evaluate the possibility of accidents in the tunnel using the proposed construction plan in front of the master under fine geological conditions,and whether the safety is guaranteed,and to realize the evaluation of the proposed construction plan based on the evaluation results.Dynamic Adjustment.Through the above-mentioned macro modeling-advanced geological forecasting-refined revised modeling-appraisal of the proposed scheme-dynamic adjustment,a practical method is provided for the evaluation of tunnel construction permit,and the feasibility of the method is verified with actual cases.The research results can be applied to general mountain tunnel engineering and have certain reference significance.