Vulnerability Analysis Of Water Supply Pipe Network By Zoning Classification

With the continuous progress of urbanization and the continuous improvement of infrastructure construction,the construction of water supply network has been all over the city,the penetration rate of urban tap water has reached 98.5%,according to the Ministry of Water Resources issued "Guidance on Ensuring the work of Rural Water Supply" pointed out that by 2025,the penetration rate of rural tap water will reach 88%;The modernization of water supply in rural areas will be basically realized by 2035.At the same time,with the continuous development of the city,the load of the water supply network also increases,and the consequences of earthquake and other disastercausing factors are also aggravated.Water supply pipe network is an important part of urban lifeline engineering.Earthquake disaster risk assessment of large regional urban water supply pipe network is one of the important basic work for regional earthquake disaster risk zoning and formulating countermeasures.At present,domestic scholars have presented earthquake vulnerability models of different materials for water supply network in our country.However,the study on the earthquake vulnerability of water supply network in different regions has not been made,which restricts the smooth implementation of earthquake disaster risk assessment of large regional water supply network.Based on this research status,this paper classifies the comprehensive seismic capacity of urban pipe networks in Northeast China by using the basic data of the structure composition and scale of some urban pipe networks in seven regions of China and combined with the seismic vulnerability of pipelines of different materials,and establishes seismic vulnerability models of five urban water supply networks with different seismic capacity categories.This paper provides a reference seismic vulnerability model for earthquake disaster risk assessment of urban water supply network without basic data support.The main work of the thesis is as follows:Firstly,according to the loss of pipelines of different materials in earthquakes and the existing vulnerability curves of pipelines of different materials,the pipelines of different materials are divided into three categories of strong and weak seismic capacity according to their seismic capacity,and the influencing factors of their seismic capacity are assigned.Collected the composition of the urban water supply network in different regions of the country,according to the data of the pipe network in the "Water supply Yearbook",respectively counted the composition of the urban water supply network,counted the length and proportion of the water supply pipeline of different materials,and calculated the comprehensive seismic capability evaluation index of different cities.According to the seismic capacity of water supply network,cities in different regions are divided into five categories.Secondly,according to the existing earthquake damage rate models of water supply pipelines with different materials,combined with the pipe network composition of seven regions and the proportion of pipes without materials,the weighted average method is used to calculate the earthquake damage rate models of pipes with different seismic capabilities in different regions.Thirdly,the damage number of water supply pipes is subject to discrete Poisson distribution.According to the damage rate model of pipes with different seismic capacities in different regions,combined with the calculation formula of Poisson distribution,the earthquake failure transcendence probability matrix and vulnerability matrix of cities with different seismic capacities in different regions are obtained,and the two-parameter lognormal cumulative distribution function is used to fit the vulnerability curve.Fourth,in order to ensure the rationality of the vulnerability curve obtained in this paper,this paper adopts the method of chi-square test to test each vulnerability curve obtained in this paper,so as to verify the rationality of the results obtained in this paper.By comparing the difference between the actual damage rate and the theoretical damage rate,the vulnerability curves obtained in this paper can all pass the goodness of fit test with a confidence rate of 95%.Fifth,according to the earthquake vulnerability curve of water supply network obtained in this paper,the loss rate of different urban water supply network in different areas of our country is analyzed.This paper introduces the traditional method of loss rate analysis and interpolation algorithm,and finally the traditional algorithm of earthquake loss rate calculation for different cities in different regions to carry out seismic loss rate analysis,and draw the PGA-based seismic loss rate curve of different urban water supply networks in different regions.