Experiment on frost heave failure mechanism of PPR water pipe. (November 2020)

• Record Type: Journal Article
• Authors: Zheng, Ji; Zhang, Jingkui; Xu, Juncai; Liu, Changshun; Xu, Liang
• Is Part Of: Engineering failure analysis. Volume 117(2020)
• Publication Date: 2020-11
• Subjects: PPR water pipe -- Frost heave failure -- Ice expansion pressure -- Mechanism analysis -- Model testing; System failures (Engineering) -- Periodicals; Fracture mechanics -- Periodicals; Reliability (Engineering) -- Periodicals; Pannes -- Périodiques; Rupture, Mécanique de la -- Périodiques; Fiabilité -- Périodiques; Fracture mechanics; Reliability (Engineering); System failures (Engineering); Periodicals; Electronic journals; 620.112
• DOI: 10.1016/j.engfailanal.2020.104831
• Languages: English
• ISSNs: 1350-6307

Abstract

Highlight: Calculation of ice expansion pressure and pipe wall thickness is obtained. PPR pipes frost heave mechanical testing is performed under regulation. Mechanism of frost heave is analyzed and verified based on PPR pipes frost heave mechanical testing. Abstract: To solve the frost heave failure of water pipelines in winter, studying the frost heave failure mechanism of water pipes is a critical issue for ensuring the safety and reliability of field irrigation and urban water supply. This paper is based on the investigation of the current polypropylene random copolymer (PPR) pipe frost heaves in residential buildings. According to theory analysis and model testing, the frost heave failure mechanism of the PPR water pipe is studied systematically. The formula of ice expansion pressure was derived based on ASTM E28-02 standard and related mechanical theories. Then the theory of PPR pipe anti-frost heave failure was proposed. The pipe thickness can be determined from the proposed theory, and the selection criteria of the PPR pipe was also provided for engineering application. Theoretical calculations and frost heave testing results showed that it is more economical and reasonable to choose S4 series PPR water pipes by comprehensively considering the factors of pipe life cycle and cost.