Longitudinal resistance performance of granular ballast beds under cyclic symmetric displacement loading

• Published in: Journal of Zhejiang University. A. Science Vol. 18; no. 8; pp. 648 - 659
• Main Authors: Xiao, Jie-ling, Liu, Hao, Xu, Jing-mang, Wang, Ping, Liu, Gan-zhong, Chen, Rong
• Format: Journal Article
• Language: English
• Published: Hangzhou Zhejiang University Press 01.08.2017; Springer Nature B.V
• Subjects: Civil Engineering; Classical and Continuum Physics; Deformation; Displacement; Energy consumption; Engineering; Industrial Chemistry/Chemical Engineering; Load resistance; Mechanical Engineering; Railroad ballast; Softening; Cyclic loading; Displacement amplitude; 位移幅值; Granular ballast bed; Longitudinal resistance; U213.71; 循环加载; 纵向阻力; 散粒体道床
• ISSN: 1673-565X; 1862-1775
• DOI: 10.1631/jzus.A1700058

The longitudinal resistance performance of a granular ballast bed under cyclic symmetric displacement loading was studied based on a full-scale test model of ballast track structures. The change law of the longitudinal resistance characteristics of the ballast bed under variable displacement amplitudes was analyzed. The results show that： the resistance-displacement curves of a granular ballast bed are a set of closed hysteretic curves, indicating obvious energy consumption; a granular ballast bed softens gradually during the cyclic process with constant displacement amplitude, and the residual deformation rate increases nonlinearly with increasing cycle number; the peak value of the longitudinal resistance of lines decreases with increasing cycle number; the cyclic softening of a granular ballast bed is dependent on the displacement amplitude-the higher the displacement, the more severe the cyclic softening will become; after cyclic displacement loading is applied several times, the longitudinal resistance of the bed will degenerate obviously, and the higher the displacement amplitude, the higher the longitudinal resistance attenuation rate of the ballast bed will become.