Analysis of Mechanical Characteristics of Degradation Railway Ballast by Direct Shear Test

JING Guoqing; HUANG Hongmei; CHANG Jinxiu; QIANG Weile

doi:10.3969/j.issn.0258-2724.2017.06.003

Volume 30 Issue 6

Dec. 2017

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Journal of Southwest Jiaotong University > 2017 > 30(6): 1055-1060.

JING Guoqing, HUANG Hongmei, CHANG Jinxiu, QIANG Weile. Analysis of Mechanical Characteristics of Degradation Railway Ballast by Direct Shear Test[J]. Journal of Southwest Jiaotong University, 2017, 30(6): 1055-1060. doi: 10.3969/j.issn.0258-2724.2017.06.003

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JING Guoqing, HUANG Hongmei, CHANG Jinxiu, QIANG Weile. Analysis of Mechanical Characteristics of Degradation Railway Ballast by Direct Shear Test[J]. Journal of Southwest Jiaotong University, 2017, 30(6): 1055-1060. doi: 10.3969/j.issn.0258-2724.2017.06.003

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Analysis of Mechanical Characteristics of Degradation Railway Ballast by Direct Shear Test

doi: 10.3969/j.issn.0258-2724.2017.06.003

Received Date: 29 Sep 2016
Publish Date: 25 Dec 2017

Abstract

Abstract

In order to study the mechanical characteristics and reuse of a washed recycled ballast, a Los Angeles abrasion tester and strain-controlled direct shear apparatus were used in experiments to investigate the stress-strain characteristics of recycled ballast with different proportions of fresh ballast under different normal stresses (50, 100, and 200 kPa). Based on the experimental results, the mechanical features of the ballast were discussed. The results show that ballast strength increased with the proportion of fresh ballast. The strength of mixtures with 50% and 100% fresh ballast were 143.4 and 176.7 kPa, respectively, under normal stress of 100 kPa; an increase of 24.0% and 52.9%, respectively, compared to pure recycled ballast. The shear dilatation of the mixture also increased with the proportion of fresh ballast. For 50% and 100% fresh ballast samples, the values are 9.842 mm and 7.969 mm, respectively, under normal stress of 100 kPa; a decrease of 25.8% and 39.9%, respectively, compared to pure recycled ballast. There was a small difference in mechanical characteristics between washed recycled ballast and fresh ballast, and the washed recycled ballast can be reused with fresh ballast under certain conditions.
- recycled ballast,
- recycled-fresh ballast mixture,
- direct shear test,
- mechanical characteristics

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Analysis of Mechanical Characteristics of Degradation Railway Ballast by Direct Shear Test

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