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

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

扫码查看
原文链接
  • NETL
  • NSTL
  • 万方数据
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 is worthwhile to investigate this aspect further.In this study,the microstructure of fines was explored by mercury intrusion porosimetry (MIP),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 Mr-σd 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,and 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,and thus an increase in Mr was observed with rising σd.

Railway engineeringResilient modulusUnsaturated soilMicrostructure

Yu SU、Yue ZHANG、Junyi DUAN、Jianglin GAO、Zhongzheng WANG、Da LIU、Bo HAN、Wenzhe ZHU

展开 >

School of Infrastructure Engineering,Nanchang University,Nanchang 330031,China

Jiangxi Provincial Technology Innovation Center for Ecological Water Engineering in Poyang Lake Basin,Jiangxi Academy of Water Science and Engineering,Nanchang 330029,China

School of Mechanical,Medical and Process Engineering,Faculty of Engineering,Queensland University of Technology,Brisbane QLD 4001,Australia

2024

10.1631/jzus.A2300492

浙江大学学报(英文版)(A辑:应用物理和工程)
浙江大学

浙江大学学报(英文版)(A辑:应用物理和工程)

CSTPCD
影响因子：0.556
ISSN：1673-565X
年,卷(期)：2024.25(12)