The Risk Assessment Of Urban Drain Pipeline Operational Safety And Its Engineering Application

The municipal drainage network is responsible for the city’s function of collecting rainwater and drain sewage.The operating environment of the drainage pipe network is very complicated,and there are many potential danger sources,which can easily cause the failure of the drainage pipe network.In order to reduce the occurrence of drainage network accidents,many scholars have carried out research on the risk assessment of drainage networks,but the research carried out mainly focuses on disaster risks such as gas explosions.There are few studies on the comprehensive risks of operational safety.There is a lack of a comprehensive risk assessment method that can be applied to actual projects.To solve this problem,the research contents are as follows:1.Through the analysis of the existing literature,we summarize the development and research status of the drainage network in China,and study the risk principle and risk assessment method to find out the main problems of the municipal municipal drainage network,which is convenient for follow-up.the study.2.Study and analyze the composition of urban drainage system,identify the dangerous sources in the operation process,and summarize the main risk factors from the two aspects of structural failure functional failure,and construct a human-machinemanagement-environment classification method.The drainage network operates a comprehensive risk indicator system.3.Establish a finite element model of buried pipeline based on temperature and tunneling caused by uneven settlement,analyze the change of pipeline stress under single factor and multi-factor coupling,so that the evaluation risk cannot ignore the difference between different factors interaction.The model was improved to calculated the failure probability of the pipeline.4.Introduce the ANP analysis method that can evaluate the interaction between different factors to calculate the weight of each factor,use fuzzy comprehensive evaluation method to classify each index,establish a fuzzy comprehensive evaluation model based on ANP,and propose the steps of comprehensive risk assessment of drainage network..The model is used to evaluate the risk of a city’s drainage network,and the drainage network is randomly tested to verify the evaluation results.The results show that the model has good accuracy.