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Journal of Zhejiang University SCIENCE A 1998 Vol.-1 No.-1 P.

http://doi.org/10.1631/jzus.A2200019


Analysis of the breakage parameters of railway ballast based on the discrete element method


Author(s):  Gan-zhong LIU, Jia-cheng DAI, Ping WANG, Rong CHEN, Hao LIU, Xian-kui WEI

Affiliation(s):  MOE Key Laboratory of High-speed Railway Engineering, Southwest Jiaotong University, Chengdu 610031, China; more

Corresponding email(s):   chenrong@home.swjtu.edu.cn

Key Words:  Ballasted track, Breakage, Discrete element method, Response surface, Parameters


Gan-zhong LIU, Jia-cheng DAI, Ping WANG, Rong CHEN, Hao LIU, Xian-kui WEI. Analysis of the breakage parameters of railway ballast based on the discrete element method[J]. Journal of Zhejiang University Science A, 1998, -1(-1): .

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publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A2200019"
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%A Jia-cheng DAI
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A1 - Xian-kui WEI
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Abstract: 
During the service lives of ballasted tracks, the ballast experiences degradation, such as breakage and fragmentation, which reduces the stability of the tracks. Ballast breakage is directly related to the shapes, sizes, and stress states of particles. The key to solving this problem is to determine the breakage parameters of railway ballast. In this study, through uniaxial compression and uniaxial shear tests, the factors associated with ballast breakage for a simple stress state were obtained. Then a refined discrete element model of railway ballast was established. The Box-Behnken method was used to design a simulation test, and a response surface method was used to obtain the optimal ballast breakage parameters. Lastly, the results of a direct shear test were compared with the simulation results to verify the correctness of the parameters and to study the shear resistance of the ballast aggregates. The results showed that for ballast particles with sizes of 22.4–63 mm, the characteristic stresses of compression and shear were not significantly affected by the size of the particles, but were greatly affected by their shape. In particular, long particles were more likely to break. During the direct shear test, the cumulative ballast breakage ratio gradually increased to 13.97%. The optimal breakage parameters of the ballast determined by this approach have high application value in the management of ballasted tracks.

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