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 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.
摘要
目的
由于列车长期的荷载作用, 道砟嵌入基床表层细粒土形成铁路路基夹层。随着荷载幅值、道砟含量和含水量的变化, 夹层中粗-细粒混合物的回弹模量发生改变, 严重影响整个路基的正常服役性能。本文旨在研究在荷载幅值σd、粗颗粒含量fv和含水量wf共同作用下混合物回弹模量Mr的演化规律和在此过程中细粒土微观结构的变化, 并揭示两者之间的内在关联。
创新点
揭示σd和wf对混合物回弹模量的耦合作用, 并解释这种耦合作用产生的微观机理。
方法
1. 基于动三轴试验, 揭示σd、fv和wf共同作用下混合物回弹模量的演化规律; 2. 通过压汞试验, 揭示不同含水量下细粒土微观结构的变化。
结论
σd和wf对Mr存在耦合作用——当wf>wp(塑限), 随着σd增加, Mr降低; 当wf<wp, 随着σd增加, Mr增加。这种耦合作用的产生可归因于细粒土微观结构变化: 当wf<wp时, 细粒土为双孔隙特征的团粒结构, 具有低压缩性, 因此随着σd增大, Mr增大; 当wf>wp时, 随着含水量增加, 团粒结构逐渐分解、解体, 可压缩性增加, 因而出现相反的情况。
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Acknowledgments
This work is supported by the Jiangxi Provincial Natural Science Foundation of China (Nos. 20224BAB214063, 20224BAB214064, and 20232BAB204083), the National Natural Science Foundation of China (Nos. 52208347 and 52208348), the China Postdoctoral Science Foundation (No. 2023M731436), and the Key Projects of Jiangxi Provincial Department of Water Resources (No. 202426ZDKT01).
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Junyi DUAN designed the research. Yue ZHANG processed the corresponding data. Yu SU wrote the first draft of the manuscript. Jianglin GAO and Zhongzheng WANG helped to organize the manuscript. Da LIU, Bo HAN, and Wenzhe ZHU revised and edited the final version.
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Yu SU, Yue ZHANG, Junyi DUAN, Jianglin GAO, Zhongzheng WANG, Da LIU, Bo HAN, and Wenzhe ZHU declare that they have no conflict of interest.
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Investigation on the resilient modulus of soil mixture at various water contents and coarse grain contents under train moving loads
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Su, Y., Zhang, Y., Duan, J. et al. Investigation on the resilient modulus of soil mixture at various water contents and coarse grain contents under train moving loads. J. Zhejiang Univ. Sci. A (2024). https://doi.org/10.1631/jzus.A2300492
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DOI: https://doi.org/10.1631/jzus.A2300492