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

http://doi.org/10.1631/jzus.A2300492


Investigation on the resilient modulus of soil mixture at various water contents and coarse grain contents under train moving loads


Author(s):  Yu SU, Yue ZHANG, Junyi DUAN, Jianglin GAO, Zhongzheng WANG, Da LIU, Bo HAN, Wenzhe ZHU

Affiliation(s):  School of Infrastructure Engineering, Nanchang University, Nanchang 330031, China; more

Corresponding email(s):   jyduan91@ncu.edu.cn

Key Words:  Railway engineering, Resilient modulus, Unsaturated soil, Microstructure


Yu SU, Yue ZHANG, Junyi DUAN, Jianglin GAO, Zhongzheng WANG, Da LIU, Bo HAN, Wenzhe ZHU. Investigation on the resilient modulus of soil mixture at various water contents and coarse grain contents under train moving loads[J]. Journal of Zhejiang University Science A, 1998, -1(-1): .

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%A Yue ZHANG
%A Junyi DUAN
%A Jianglin GAO
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%A Da LIU
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%J Journal of Zhejiang University SCIENCE A
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A1 - Bo HAN
A1 - Wenzhe ZHU
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DOI - 10.1631/jzus.A2300492


Abstract: 
Interlayer soil in railway substructures is characterized by a fine/coarse soil mixture. Considering that the resilient modulus Mr of the mixture is influenced by the microstructure of fine soil, it appears worthwhile to investigate this aspect further. In this work, the microstructure of fines was explored by mercury intrusion porosimetry, and its influence on the Mr of the mixture was studied by multi-stage dynamic triaxial tests with varying deviator stress amplitudes σd. The results showed a fine matrix fabric obtained at water contents of fine soil wf=17.6% and 13.7% (> the plastic limit of fine soil wp=12%), and a fine aggregate fabric identified at wf=10.6% (< wp=12%). Interestingly, the influences of wf and σd on the Mr of the mixture were observed: the rise in σd contributed to a decline in Mr when wf>wp but to an increase in Mr when wf<wp. It was concluded that, for the fine matrix fabric (wf>wp), increasing σd induced a reduction in Mr, while for the fine aggregate fabric (wf<wp), increasing σd gave rise to the growth of Mr. The distinct Mrσd behaviors for these two fabrics were explained by the competing influences between soil hardening upon loading and soil rebounding upon unloading. For the fine matrix fabric (wf>wp), considering its high deformability, the rebounding effect on Mr outweighed the hardening effect, thus a decline in Mr occurred with the growth of σd. Conversely, for the fine aggregate fabric (wf<wp), the rebounding effect on Mr was secondary compared with the hardening effect based on the consideration of its low deformability, thus an increase in Mr was observed with rising σd.

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