Contribution à l’optimisation de la gestion intégrée des infrastructures urbaines

Abstract

This thesis aims to elaborate new grids and methodologies for accessing water and sewer pipes condition in order to identify in an optimal, cost-effective and sustainable way, required interventions, priorities of each intervention, and the opportunities for effective coordination of interventions between infrastructures coexisting in the same trench, especially water pipes, sewer pipes and pavements. To optimize water pipes renewal, we have developed a new approach that integrates a dynamic process for establishing pipes lifetimes, spatial and temporal impact of previous breakages on future degradation, and results from comparative analysis of the performance of various status indicators. The new approach is based on data collected from nearly 6,000 kilometers of water pipes, such as the good spatial and temporal correlation detected between successive breaks on a pipe, and differences observed between actual lifetimes established with the dynamic proposed method and theoretical lifetimes stated in the literature. The proposed approach has been validated through a case study. The results are very conclusive and demonstrate that interventions resulting from the proposed approach are more optimal than the interventions from the comparative approaches used in the case study. For sewer pipes, it was proposed to combine MAMH methodology with that of the WRc in order to establish a new status of condition assessment grid, based on a more robust, effective and proactive approach that integrates structural indicators, hydraulic or functional indicators and aggravating factors. The feasibility and interest of the new methodology have been validated in a case study conducted on some sewers of Montreal City. The results show the enormous potential of this method to better illustrate the reality of sewer pipes in terms of status of condition, vulnerability and taking into account internal and external factors influencing their behaviour and temporal degradation. The development of simple and effective criteria for interventions coordination on water pipes, sewer and road was carried out using a method of comparative analysis of costs and benefits associated with various integrated and non-integrated intervention scenarios. The results of this comparative analysis of effectiveness, have made it possible to propose in this thesis, a rigorous, objective and realistic framework intended to support the infrastructure managers and to inform them on the best opportunities for projects coordination, all depending on the condition of each infrastructure of the trench, at the time of the study.

Date	25 Feb 2022
Original language	French
Awarding Institution	École de technologie supérieure
Supervisor	Saad Bennis (Supervisor)