Sécurité des réseaux d’adduction d’eau potable en présence de défaut superficiel sous l’effet du phénomène de coup de bélier

Abstract : The water crisis in the world and the shortage of water resources require good management of this precious resource. Good management requires, first and foremost, a reliable drinking water supply system with low leakage rate. Leakage caused by the rupture of pipes, fairly frequent phenomenon in urban areas, initiate from a pre-existing defect in the pipe wall. The initiation and propagation of the crack occur under environmental stress caused by passing vehicles, or it can happen brutally due to water hammer phenomenon. The severity of these phenomena depends on several parameters including the nature of the piping material. Polymeric materials such as HDPE, take a great part of the water transport market, thanks to their many qualities (reduced cost, ease of installation, flexibility), especially in secondary network distribution system. Currently, the use of this material in the supply networks (aqueducts) is booming but less studied in research works. The aim of the present work is to study the failure of high density polyethylene pipes for the supply of drinking water and their resistance to water hammer phenomenon. In order to address this issue, first we have characterized experimentally the mechanical fracture behavior of HDPE pipe. Then, we have developed a finite element calculation tool allowing the modeling of pipes subjected to internal pressure loads. As a result of this numerical study, we proposed a semi-empirical model linking the failure pressure to the size of pre-existing defects as well as the pipe dimensions. Finally, we applied the developed tools on an existing drinking water system. The behavior of HDPE pipe subjected to a water hammer phenomenon was analyzed
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Mohamed Ali Bouaziz. Sécurité des réseaux d’adduction d’eau potable en présence de défaut superficiel sous l’effet du phénomène de coup de bélier. Autre. Université de Lorraine; Université de Sfax (Tunisie), 2016. Français. ⟨NNT : 2016LORR0044⟩. ⟨tel-01754690⟩

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