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A platform for research: civil engineering, architecture and urbanism
Experimental Research on the Dynamic Parameters Characteristics of Coarse Granular Soil Filler for Heavy-Haul Railways
The dynamic characteristics of the railway have important engineering significance for guiding the design and construction of railway subgrades. In this paper, we conducted a large-scale indoor dynamic triaxial experiment for coarse-grained fillers. Through this experiment, the effects of confining pressure, loading frequency as well as other factors on the dynamic parameters (backbone curve, dynamic shear modulus Gd, and damping ratio λ characteristics of coarse granular soil were studied. The results showed that: The varied curve of the dynamic shear stress σd and the dynamic shear strain γd of the coarse-grained soil satisfies the Hardin hyperbolic model. With an increase in confining pressure and loading frequency, the dynamic shear stress σd required to yield the same dynamic shear strain γd increases; The dynamic shear modulus Gd of the coarse-grained soil decreases nonlinearly as the dynamic shear strain γd increases; furthermore, the dynamic shear modulus increases gradually with the increase of confining pressure and loading frequency; The damping ratio λ of the coarse granular soil increases rapidly first and then stabilizese with the dynamic shear strain γd. The damping ratio λ is positively correlated with the confining pressure and the loading frequency. Finally, according tothe test results, the equation of the curve of the damping ratio λ and the dynamic shear strain γd is established.
Experimental Research on the Dynamic Parameters Characteristics of Coarse Granular Soil Filler for Heavy-Haul Railways
The dynamic characteristics of the railway have important engineering significance for guiding the design and construction of railway subgrades. In this paper, we conducted a large-scale indoor dynamic triaxial experiment for coarse-grained fillers. Through this experiment, the effects of confining pressure, loading frequency as well as other factors on the dynamic parameters (backbone curve, dynamic shear modulus Gd, and damping ratio λ characteristics of coarse granular soil were studied. The results showed that: The varied curve of the dynamic shear stress σd and the dynamic shear strain γd of the coarse-grained soil satisfies the Hardin hyperbolic model. With an increase in confining pressure and loading frequency, the dynamic shear stress σd required to yield the same dynamic shear strain γd increases; The dynamic shear modulus Gd of the coarse-grained soil decreases nonlinearly as the dynamic shear strain γd increases; furthermore, the dynamic shear modulus increases gradually with the increase of confining pressure and loading frequency; The damping ratio λ of the coarse granular soil increases rapidly first and then stabilizese with the dynamic shear strain γd. The damping ratio λ is positively correlated with the confining pressure and the loading frequency. Finally, according tothe test results, the equation of the curve of the damping ratio λ and the dynamic shear strain γd is established.
Experimental Research on the Dynamic Parameters Characteristics of Coarse Granular Soil Filler for Heavy-Haul Railways
Iran J Sci Technol Trans Civ Eng
Zhang, Yu (author) / Wang, Xuan (author) / Ding, Yu (author) / Jia, Yu (author) / Li, Yongqiang (author) / Zhang, Jiasheng (author) / Chen, Xiaobin (author)
2025-02-01
11 pages
Article (Journal)
Electronic Resource
English
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