Study On Dynamic Risk Assessment Method Of Mountain Highway Tunnel Construction Safety

Mountain highway tunnel is an underground project.Due to complicated geological environment,long construction period and large scale,there are many unpredictable risk factors in the construction,which can easily lead to construction safety accidents.In order to track and control the construction safety of mountain highway tunnel in real time and improve the construction safety of the tunnel,it is necessary to carry out dynamic risk assessment during the construction of mountain highway tunnel.This paper studies and explores the dynamic risk assessment method of mountain highway tunnel construction safety,and successfully applies the relevant results to the construction risk assessment of shanshan mountain highway tunnel.The main research contents and relevant results are as follows:(1)This paper summarizes the research progress of safety risk assessment of tunnel construction at home and abroad,and through the investigation and statistics of safety accidents of mountain highway tunnel construction in recent years,it is determined that the main safety accidents of mountain tunnel construction are landslide and gushing water.Based on the further in-depth analysis of the factors affecting the safety accidents of landslides and water gushing construction,and combined with the thought of man-machine-environment-management system,a safety risk evaluation index system for mountain highway tunnel construction was finally established.(2)Establish the mountain highway tunnel construction safety risk estimation model,and determine the probability membership degree and loss membership degree of construction safety risk;Using the analytic hierarchy process,the initial weight of each construction safety risk evaluation index of mountain highway tunnel is calculated.The construction status information of each construction safety risk assessment index is collected and quantitatively analyzed based on the methods of field inspection and monitoring measurement.This paper introduces the theory of state variable weight,establishes the evaluation model of variable weight,and substitute the initial weight of each risk assessment and the corresponding construction status information into the model to determine the dynamic weight of each construction safety risk evaluation index of mountain highway tunnel.(3)The fuzzy comprehensive method,risk matrix method and weighted average method are adopted to conduct fuzzy evaluation of dynamic risk of mountain highway tunnel construction safety.According to the probability degree and loss degree of mountain highway tunnel construction safety risk,the risk evaluation index and risk grade of each risk factor are determined.On this basis,combined with the risk matrix method and the weighted average method,the overall construction safety risk level of mountain highway tunnel is determined,and the dynamic evaluation of the construction safety risk of mountain highway tunnel is realized.(4)Based on.Net Framework platform,based on the C # language,research and development of "intelligent mountain highway tunnel construction safety dynamic risk assessment system",through the system of dynamic construction of mountain highway tunnel construction safety information storage,query,update and management,implementation of mountain highway tunnel construction safety risk assessment of intelligent state,the work safety of construction personnel based on the system real-time feedback dynamic risk information in a timely manner to understand and control the change of dynamic risk,develop risk control measures in time.(5)The "mountain highway tunnel construction safety dynamic risk intelligent assessment system" is applied to the dynamic risk assessment of the mountain highway tunnel construction safety in zhanmashan,and corresponding risk control measures are formulated in time according to the dynamic risk assessment status of real-time feedback.The risk assessment results determined by the application system are basically consistent with the risk situation in the field construction of shanling highway tunnel in zhuama mountain,indicating that the dynamic risk intelligent assessment system developed in this paper is applicable to the dynamic risk assessment of the construction safety of shanling highway tunnel.