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

http://doi.org/10.1631/jzus.A2100664


Effects of water content, coarse grain content and deviator stress amplitude on the resilient modulus of a fine/coarse soil mixture subjected to long-term cyclic loading


Author(s):  Yu SU, Bo HAN, Jun-yi DUAN, Zhong-zheng WANG, Jiang-lin GAO, Fu-min ZHAO, Da LIU

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

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

Key Words:  Resilient modulus, Soil mixture, Cyclic triaxial test, Mercury intrusion porosimetry, Water content, Coarse grain content


Yu SU, Bo HAN, Jun-yi DUAN, Zhong-zheng WANG, Jiang-lin GAO, Fu-min ZHAO, Da LIU. Effects of water content, coarse grain content and deviator stress amplitude on the resilient modulus of a fine/coarse soil mixture subjected to long-term cyclic loading[J]. Journal of Zhejiang University Science A, 1998, -1(-1): .

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%T Effects of water content, coarse grain content and deviator stress amplitude on the resilient modulus of a fine/coarse soil mixture subjected to long-term cyclic loading
%A Yu SU
%A Bo HAN
%A Jun-yi DUAN
%A Zhong-zheng WANG
%A Jiang-lin GAO
%A Fu-min ZHAO
%A Da LIU
%J Journal of Zhejiang University SCIENCE A
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%I Zhejiang University Press & Springer
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A1 - Bo HAN
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A1 - Zhong-zheng WANG
A1 - Jiang-lin GAO
A1 - Fu-min ZHAO
A1 - Da LIU
J0 - Journal of Zhejiang University Science A
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PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.A2100664


Abstract: 
An interlayer soil was identified in French conventional rail tracks, corresponding to a mixture of subgrade fine soil and ballast grains. To investigate the role of fine soil on the resilient modulus Mr of the mixture, three water contents of fine soil wf (17.6%, 13.7% and 10.6%), five coarse grain contents fv (0%, 10%, 20%, 35% and 45%) and five deviator stress amplitudes σd (10, 15, 20, 25, 30 kPa) were considered. Multi-stage cyclic triaxial tests were conducted for the determination of Mr. mercury intrusion porosimetry tests were performed for the microstructural observation of the fine soil. A uni-modal porosity microstructure, characterized by a global fine matrix, was identified at wf =17.6% and 13.7% (> plastic limit of fine soil wp=12%), while a bi-modal porosity microstructure with well-developed aggregates was identified at wf =10.6% (< wp=12%). Interestingly, combined effects of wf and σd on Mr of the mixture were found. Increasing σd led to a decrease of Mr when wf>wp, but an increase of Mr when wf<wp. This led to the conclusion that, for the fine matrix fabric (wf>wp), an increase of σd led to a decrease of Mr, while for the fine aggregate fabric (wf<wp) an increase of σd led to an increase of Mr. The distinct Mr - σd behaviors for these two fabrics were attributed to the competing effects between soil hardening during the loading procedure and rebounding during the unloading procedure. For the fine matrix fabric (wf>wp), due to its high deformability, the rebounding effect on Mr appeared to be more significant than the hardening effect, resulting in a decrease of Mr with increasing σd. By contrast, for the fine aggregate fabric (wf<wp), owing to its low deformability, the rebounding effect on Mr was not as significant as the hardening effect, and thus an increase of Mr with increasing σd.

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