JZUS - Journal of Zhejiang University SCIENCE

Journal of Zhejiang University SCIENCE A

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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, Nanchang330031, China; more
Corresponding email(s): jyduan91@ncu.edu.cn
Key Words: Railway engineering; Resilient modulus; Unsaturated soil; Microstructure

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Abstract: Interlayer soil in railway substructures is characterized by a fine/coarse soil mixture. Considering that the resilient modulus M_r 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 M_r of the mixture was studied by multi-stage dynamic triaxial tests with varying deviator stress amplitudes σ_d. The results showed a fine matrix fabric obtained at water contents of fine soil w_f=17.6% and 13.7% (>the plastic limit of fine soil w_p=12%), and a fine aggregate fabric identified at w_f=10.6% (<w_p=12%). Interestingly, the influences of w_f and σ_d on the M_r of the mixture were observed: the rise in σ_d contributed to a decline in M_r when w_f>w_p but to an increase in M_r when w_f<w_p. It was concluded that, for the fine matrix fabric (w_f>w_p), increasing σ_d induced a reduction in M_r, while for the fine aggregate fabric (w_f<w_p), increasing σ_d gave rise to the growth of M_r. The distinct M_r-σ_d 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 (w_f>w_p), considering its high deformability, the rebounding effect on M_r outweighed the hardening effect, and thus a decline in M_r occurred with the growth of σ_d. Conversely, for the fine aggregate fabric (w_f<w_p), the rebounding effect on M_r was secondary compared with the hardening effect based on the consideration of its low deformability, and thus an increase in M_r was observed with rising σ_d.

列车荷载-含水量-粗颗粒含量共同作用下混合物回弹模量的演化机制研究

作者：粟雨^1,2，张悦¹，段君义¹，高江林²，王中正³，刘达²，韩波¹，朱文哲¹
机构：¹南昌大学，工程建设学院，中国南昌，330031；²江西省水利科学院，江西省鄱阳湖流域生态水利技术创新中心，中国南昌，330029；³昆士兰科技大学，工程学院，澳大利亚布里斯班，QLD 4001
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σ_d、粗颗粒含量f_v和含水量w_f共同作用下混合物回弹模量M_r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σ_d和w_f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σ_d、f_v和w_f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：σ_d和w_f对M_r存在耦合作用--当w_f>w_p（塑限）,随着σ_d增加，M_r降低；当w_f<w_p，随着σ_d增加，M_r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w_f<w_p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σ_d增大，M_r增大；当w_f>w_p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。

关键词组：铁路工程；回弹模量；非饱和土；微观结构

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列车荷载-含水量-粗颗粒含量共同作用下混合物回弹模量的演化机制研究

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