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Open AccessArticle

Effect of Cyclic Load Amplitude on the Evolving Characteristics of Accumulative Deformation in Subgrade Bed

by Gang Liu 1,2,3, Mingzhi Zhao 1,2,*, Qiang Luo 3,4 and Hongyu Jia 4
1
School of Civil Engineering, Architecture and Environment, Xihua University, Chengdu 610039, China
2
Institute of Geotechnical Engineering, Xihua University, Chengdu 610039, China
3
MOE Key Laboratory of High-Speed Railway Engineering, Southwest Jiaotong University, Chengdu 610031, China
4
School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China
*
Author to whom correspondence should be addressed.
Appl. Sci. 2019, 9(7), 1435; https://doi.org/10.3390/app9071435
Received: 20 February 2019 / Revised: 24 March 2019 / Accepted: 2 April 2019 / Published: 5 April 2019
(This article belongs to the Special Issue Bridge Dynamics)
To investigate the evolving characteristics of plastic deformation for the angular gravels that are used to construct subgrade bed, a laboratory model test is performed with cyclic load applying. Vertical deformation is measured in real time by displacement transducers and further modified to analyze the plastic behavior of model fillings. It can be found that vertical plastic deformation shows quite different developing patterns under the effect of different cyclic amplitudes for a given model. A power function is adopted to describe the relationship between deformation rate and loading times. By analyzing the value of the power exponent and the corresponding developing features of plastic deformation rate, model filling status can be classified into four different zones, i.e., rapid stabilization, tardy stabilization, tardy failure, and rapid failure. Such a classification reveals different developing patterns of plastic deformation and satisfies the design of subgrade bed for ballasted and unballasted railway. View Full-Text
Keywords: subgrade bed; angular gravel; accumulative deformation; rapid stabilization; tardy stabilization; tardy failure; rapid failure subgrade bed; angular gravel; accumulative deformation; rapid stabilization; tardy stabilization; tardy failure; rapid failure
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Liu, G.; Zhao, M.; Luo, Q.; Jia, H. Effect of Cyclic Load Amplitude on the Evolving Characteristics of Accumulative Deformation in Subgrade Bed. Appl. Sci. 2019, 9, 1435.

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