Effect of Flakiness-Elongation Index on Shear Behavior of Railway Ballast

JING Guoqing; QIANG Weile; CHANG Jinxiu; LI Xu

doi:10.3969/j.issn.0258-2724.20180677

Volume 55 Issue 4

Jul. 2020

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Journal of Southwest Jiaotong University > 2020 > 55(4): 688-694.

JING Guoqing, QIANG Weile, CHANG Jinxiu, LI Xu. Effect of Flakiness-Elongation Index on Shear Behavior of Railway Ballast[J]. Journal of Southwest Jiaotong University, 2020, 55(4): 688-694. doi: 10.3969/j.issn.0258-2724.20180677

Citation:

JING Guoqing, QIANG Weile, CHANG Jinxiu, LI Xu. Effect of Flakiness-Elongation Index on Shear Behavior of Railway Ballast[J]. Journal of Southwest Jiaotong University, 2020, 55(4): 688-694. doi: 10.3969/j.issn.0258-2724.20180677

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Effect of Flakiness-Elongation Index on Shear Behavior of Railway Ballast

doi: 10.3969/j.issn.0258-2724.20180677

Received Date: 10 Aug 2018
Rev Recd Date: 30 Sep 2018

Available Online: 11 Mar 2020

Publish Date: 01 Aug 2020

Abstract

Abstract

In order to investigate the influences of flat and (or) elongated ballasts on direct shear mechanical properties considering the breakage effect, the direct shear tests with different test conditions were conducted to study the effect of the flat and/or elongated ballast content with the analysis of testing results from the ballast shear strength, deformation and breakage. The results show that: (1) With the increase of the flakiness and elongation index, the shear behavior of the ballast decreases, both the shear strength and internal friction angle (at 100 kPa, the shear strength respectively decreases by 10.9%, 16.8% when the elongation index increases from 0 to 20%, 40%; the shear strength respectively decreases by 14.7%, 22.3% when the flakiness index increases from 0 to 20%, 40%; the shear strength respectively decreases by 12.4%, 18.9% when the flakiness-elongation index increases from 0 to 20%, 40%). (2) The shear dilatation and shrinkage of samples decrease with the flat and/or elongated ballast content increasing. (3) The flat and elongated ballast particles are prone to break up during the direct shear test, and most of them are fractured with the sharp corner breakage, which significantly affects the ballast bed maintenance cycle.
- railway ballast,
- flakiness index,
- elongation index,
- direct shear test

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References(21)

References

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