Expansive potential of ballastless track on high speed railway mudstone foundation with low clay mineral content

DING Xiaogang; MA Lina; ZHANG Rongling; LI Jiamin; ZHANG Tangyu; WANG Binwen

doi:10.16031/j.cnki.issn.1003-8035.2021.01.15

2021 Vol. 32, No. 1

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Article navigation > The Chinese Journal of Geological Hazard and Control > 2021 > 32(1): 108-116

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DING Xiaogang, MA Lina, ZHANG Rongling, LI Jiamin, ZHANG Tangyu, WANG Binwen. Expansive potential of ballastless track on high speed railway mudstone foundation with low clay mineral content[J]. The Chinese Journal of Geological Hazard and Control, 2021, 32(1): 108-116. doi: 10.16031/j.cnki.issn.1003-8035.2021.01.15

Citation:

DING Xiaogang, MA Lina, ZHANG Rongling, LI Jiamin, ZHANG Tangyu, WANG Binwen. Expansive potential of ballastless track on high speed railway mudstone foundation with low clay mineral content[J]. The Chinese Journal of Geological Hazard and Control, 2021, 32(1): 108-116. doi: 10.16031/j.cnki.issn.1003-8035.2021.01.15

Expansive potential of ballastless track on high speed railway mudstone foundation with low clay mineral content

1.
College of Civil Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu　730070, China
2.
Key Laboratory of Road & Bridges and Underground Engineering of Gansu Province, Lanzhou Jiaotong University, Lanzhou, Gansu　730070, China
3.
Cardiff University School of Engineering, UK, CF24 3AA

More Information

Corresponding author: MA Lina, malinalanzhou@163.com

Received Date: 12 January 2020

Revised Date: 19 February 2020

Publish Date: 25 February 2021

Abstract

Abstract

In order to study the influence of different clay mineral contents in low clay mineral content mudstone foundation on the swelling potential and swelling upper arch deformation of ballastless track subgrade of high-speed railway, supplement and improve the existing standards for the determination and classification of ballastless expansive soil. Mudstone samples were selected from 25 typical roadbed arch diseased sections to conduct X-ray diffraction experiments. The free expansion rate experiment and cation exchange capacity experiment were optimized. The principal component analysis (PCA) method was used to extract the cumulative variance interpretation amount of 90.098% for dimension reduction analysis. And combined with the actual project to classify the interval. The results show that: PCA can exclude the influence of co-linearity between factors on the model results. Based on statistical significance, three factors can be used to characterize the good linear relationship between the swelling potential of expansive soil and micro-factors; by simplifying and optimizing physical indicators, the obtained index F for expansive soil has a Person correlation with the amount of arch on the actual track increased to 0.902; according to the actual expansion conditions of the line and the expansion grade interval divided by F, the accuracy of the judgment of the existing standards is significantly improved. The research results can provide reference and theoretical support for the identification of the expansive soil and disaster prevention along the high-speed railway.
- ballastless track /
- clay mineral /
- expansive mudstone /
- principal component analysis /
- grade determination

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References

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