Seisimic Reliability Analysis Of Water Supply Network Based On Time Delay Simulation And Repair Optimization After Earthquake

The daily water supply for urban residents is provided by underground water supply network.The normal operation of water supply network can effectively guarantee people’s living needs.In addition,emergency water supply plays an important supporting role in disaster relief work.If there is not enough water to provide fire relief supplies(secondary disasters caused by earthquakes,such as fire rescue),it is easy to cause secondary disasters to spread.Considering the great significance of water supply network to urban people’s life,this paper makes a systematic analysis on the reliability of urban water supply network and the optimization sequence of pipeline repair after earthquake based on the time-delay simulation method.The research work is as follows:(1)By comparing the existing reliability evaluation methods,including analytical method,agent method and simulation method,the author puts forward his own ideas and reflections,and expounds the main reasons why he chooses monte carlo simulation method as the reliability analysis method.(2)Considering the changing characteristics of water supply network before and after the earthquake,monte carlo simulation method was used to simulate the earthquake damage to water supply network,and the damaged network was obtained after the earthquake.EPANET software was used for low-pressure hydraulic analysis,and the deficiency of low-pressure operating network was solved by using demand driven method for improvement of GIRAFFE,and the actual water allocation was solved by using pressure driven method.Finally,the hydraulic functional reliability of the network system that was more in line with the actual situation was calculated.The reliability of two different ways to solve the problem of negative pressure is compared and analyzed.(3)Considering the earthquake dynamic change of water supply network topology structure and the pipeline damage,based on the urban water supply network reliability analysis model based on delay simulation network restore dynamic process changes analysis model,combining with earthquake space flow characteristics and user nodes under different relief temporal demand,pressure to flow method is used for water supply pipe network hydraulic simulation after the quake,function reliability analysis of urban water supply pipe network hydraulic dynamic change.(4)In order to optimize the repair arrangement of damaged pipelines after earthquake,a probabilistic statistical method was used to establish the damaged pipeline network model after earthquake,and the evaluation index of pipeline restoration sequence was proposed to optimize the repair sequence of multiple pipelines.