Research On Safety Risk Assessment Of Railway Long And Large Tunnel Construction

In recent years,with the speeding up of railway construction in western my country,the scale of long railway tunnels has expanded year by year and the number has begun to increase substantially.Compared with road and bridge engineering,long and large tunnels are more susceptible to environmental factors such as hydrology,geology,etc.The construction environment is harsh and technical requirements are high,often accompanied by unpredictable construction safety risks.Therefore,safety risk assessment during the construction phase of railway long and large tunnels has Very important meaning.First,the paper identifies the potential safety risk factors of the long tunnel through the statistical analysis of the safety risk accident cases in the construction stage of the long tunnel in recent years,and combines the literature review identification method to supplement the identification of the safety risk factors in the tunnel construction stage,and obtains the safety risk Preliminary evaluation index system,use questionnaire survey method to integrate and screen the obtained preliminary safety risk evaluation indexes,and finally build a safety risk evaluation index system during the construction phase of long railway tunnels.On the basis of the construction of the index system,this paper sets quantitative standards through existing tunnel safety risk related laws and regulations,and combines the quantitative standards and expert advice to fuzzy and quantify the safety risk index system.Then,the fuzzy neural network Layer parameters are designed to obtain a model combining principal component analysis and neural network;finally,two evaluation methods of evaluation model and fuzzy algorithm are used to evaluate the safety risk of WLS railway tunnels,and comparative analysis is performed to verify the accuracy and effectiveness of the model.According to the evaluation results,the key influencing factors of the safety risk in the construction stage of the WLS railway tunnel are analyzed and the overall safety risk status of the WLS tunnel is obtained,and countermeasures are proposed for the key influencing factors of the safety risk in the construction stage.