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Cumulative permanent strain and critical dynamic stress of silty filler for subgrade subjected to intermittent cyclic loading of trains

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Abstract

The long-term loading of the trains on the subgrade in service is the cyclic loading when the train passes and the intermittent stage when there is no train passing. However, in most studies, continuous loading was used to investigate the dynamic characteristics of a subgrade soil, which ignores the effect of loading intermittence. The aims of this research were first to study the cumulative permanent deformation behaviors under intermittent cyclic loading of trains, then to establish the classification criterion for cumulative permanent strain behaviors, and finally to propose a practical method for estimating the critical dynamic stress in the intermittent loading mode. For this purpose, according to the actual conditions of the subgrade of Shuo-Huang Heavy-Haul Railway, the monotonic triaxial test and the cyclic triaxial test with intermittent loading were performed. Based on the shakedown theory, the cumulative permanent strain behaviors under intermittent loading can be classified into three categories of plastic shakedown, plastic creep, and incremental collapse. Then, the classification criterion was established based on the permanent strain rate. Finally, an empirical formula of critical dynamic stress for intermittent loading, which could also consider the varying moisture content, was proposed.

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Abbreviations

ρs :

particle density

ρdmax :

maximum dry density

w opt :

optimum moisture content

w int :

intermediate moisture content

w sat :

saturated moisture content

k :

permeability coefficient

w L :

liquid limit

w p :

plastic limit

Ip :

plastic index

K :

compaction coefficient

σ3 :

confining pressure

σs :

static deviating stress

σd :

dynamic stress amplitude

εp :

cumulative permanent strain

εe :

resilient strain

σ1max :

maximum axial stress

q f :

undrained shear strength

t :

loading time

N :

number of loading cycles

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Acknowledgements

The authors’ research was supported by the National Natural Science Foundation of China (No.51878666, 51978672) and the Innovation Project of Central South University (Grant No. 2018zzts192).

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Authors and Affiliations

  1. Department of Geotechnical Engineering, School of Civil Engineering, Central South University, Changsha, 410075, Hunan, China

    Yafeng Li, Rusong Nie, Wuming Leng, Junli Dong & Baoli Sun

  2. MOE Key Laboratory of Engineering Structures of Heavy-Haul Railway, Central South University, Changsha, 410075, Hunan, China

    Rusong Nie & Wuming Leng

  3. Department of Geotechnical and Tunnel Engineering, School of Civil Engineering Changsha University of Science and Technology, Changsha, 410114, Hunan, China

    Yipeng Guo

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  1. Yafeng Li
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  2. Rusong Nie
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  3. Wuming Leng
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  4. Yipeng Guo
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  5. Junli Dong
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Correspondence to Rusong Nie.

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Li, Y., Nie, R., Leng, W. et al. Cumulative permanent strain and critical dynamic stress of silty filler for subgrade subjected to intermittent cyclic loading of trains. Bull Eng Geol Environ 80, 3079–3096 (2021). https://doi.org/10.1007/s10064-021-02125-5

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  • DOI: https://doi.org/10.1007/s10064-021-02125-5

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