Analysis of mechanical properties of polyurethane-mixed ballast based on energy method. (10th September 2018)

• Record Type: Journal Article
• Authors: Ling, Xing; Xiao, Hong; Cui, Xuhao
• Is Part Of: Construction & building materials. Volume 182(2018)
• Page Start: 10
• Page End: 19
• Publication Date: 2018-09-10
• Subjects: Polyurethane-mixed ballast -- Energy -- Field test -- Discrete element model; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2018.06.008
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: The evolution law of macro energy was analyzed through the field test. The discrete element model of polyurethane-mixed ballast was established. The mechanical properties were analyzed using the energy method. Abstract: The vertical loading-unloading trial was conducted on the polyurethane-mixed ballast of high-speed railway, obtaining the evolution law of macro energy of the polyurethane-mixed ballast. The discrete element model of the polyurethane-mixed ballast was established by PFC3D, and the parameters were calibrated and verified by the field test data. The evolution laws of micro energy of under the quasi-static load and trainload were analyzed. The results show that there were four main energies in the polyurethane-mixed ballast, namely elastic strain energy, viscous strain energy, friction energy and dashpot energy. The friction energy was the main form of energy, followed by the elastic strain energy. The viscous strain energy was larger than the dashpot energy under the quasi-static load, while the dashpot energy was larger than the viscous strain energy under the trainload. Under the quasi-static load, the elastic strain energy of the contact points between sleeper and ballast decreased at power rate, while other energy decreased exponentially. Under the trainload, the four kinds of energy of sleeper-ballast contact points decreased exponentially. The friction energy and elastic strain energy had a higher proportion on the bottom of sleeper. The viscous strain energy and dashpot energy had a higher proportion on the side of sleeper.