Resilience And Vulnerability Evaluation And Comparative Study Of Direct Buried Pipeline Integrated System

In recent years,with the rapid development of urban construction,the municipal pipeline network has expanded rapidly in the underground space of cities,and accidents have occurred frequently,which has attracted significant attention to the safety of directburied pipeline systems.With the development of the concepts of "resilience" and "vulnerability," pipeline systems are now envisioned as having high resilience and low vulnerability.This paper evaluates the resilience and vulnerability of the direct buried pipeline system from a integrated system perspective,combining prospect theory and network cascading failure,and compares the similarities and differences between the two.The main research is as follows:(1)Based on existing literature research,the possible influencing factors and research perspectives of the pipeline integrated system safety are explored.The intercorrelation of various influencing factors is analyzed using complex network analysis,and indicators such as network node density and importance are calculated to select key influencing factors and establish research perspectives.(2)Combining the resilience theory,an evaluation index system for the resilience of the pipeline integrated system is built based on the selected influencing factors.The resilience of the pipeline integrated system is evaluated from the three stages of resistance,damage,and recovery using the prospect theory method.Evaluation calculation programs are written in Matlab,and an example calculation is completed using data from a certain university pipeline network system.(3)Based on vulnerability theory,various buried pipeline networks are topologically analyzed in Matlab according to their characteristics,and a single-layer network cascading failure simulation is performed using the load-capacity model after single-point damage.Starting from the perspective of the pipeline integrated system,the inter-pipeline correlation relationship function is added,and a multi-layer network cascading failure simulation of various pipeline networks after single-point damage is performed using the improved load-capacity model.The failure scale caused by each point damage is calculated to evaluate the vulnerability of pipeline segments in the pipeline network,and the critical vulnerable points of the single-layer and multi-layer pipeline networks are determined.An example calculation verification is completed using the same instance as the resilience evaluation.(4)The resilience evaluation results of the buried pipeline integrated system are compared and analyzed with the vulnerability evaluation results from both theoretical and results aspects to explore their similarities and differences.This paper has important theoretical significance and practical value for evaluating the resilience and vulnerability of the buried pipeline integrated system,determining the vulnerable points and improving the safety of the pipeline system in a targeted manner.