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Dynamic damping ratio of mudded intercalations with small and medium strain during cyclic dynamic loading
Abstract Identifying the dynamic damping ratio attenuation behaviour of mudded intercalations with small and medium strain is valuable. This work aimed at exploring a correction model to describe the relationship between the dynamic damping ratio and small and medium dynamic strain. The impacts factors included (i) dynamic strain, (ii) confining pressure, (iii) water content, (iv) clay content, and (v) frequency. Specimens of mudded intercalations were sampled from China, and remodeled to prepare for the dynamic triaxial tests with small and medium strain. The test results show that the dynamic damping ratio under a low frequency is correlated with the small and medium dynamic strain (negative), confining pressure (positive), water content (positive), and clay content (initially positive and then negative). The correction model offers a good adaptability to the dynamic damping ratio of mudded intercalations and other soils with small and medium strain. The correction model parameters are impacted by clay content (strongly), water content (strongly) and confining pressure (weakly). When frequency is excessive, the dynamic damping ratio is correlated with the small and medium dynamic strain (positive), confining pressure (initially positive and then negative), and water content (negative); no significant correlation with clay content was detected.
Highlights Experimentally identifying the attenuation behaviour of small-strain dynamic damping ratio of mudded intercalations. Formulating a correction Hardin-Drnevich model to describe the small-strain dynamic damping ratio properties. Revealing the impact factors of the small-strain dynamic damping ratio of mudded intercalations along with their impacts. The healing of damage has a great influence on the small-strain dynamic damping ratio properties of mudded intercalations
Dynamic damping ratio of mudded intercalations with small and medium strain during cyclic dynamic loading
Abstract Identifying the dynamic damping ratio attenuation behaviour of mudded intercalations with small and medium strain is valuable. This work aimed at exploring a correction model to describe the relationship between the dynamic damping ratio and small and medium dynamic strain. The impacts factors included (i) dynamic strain, (ii) confining pressure, (iii) water content, (iv) clay content, and (v) frequency. Specimens of mudded intercalations were sampled from China, and remodeled to prepare for the dynamic triaxial tests with small and medium strain. The test results show that the dynamic damping ratio under a low frequency is correlated with the small and medium dynamic strain (negative), confining pressure (positive), water content (positive), and clay content (initially positive and then negative). The correction model offers a good adaptability to the dynamic damping ratio of mudded intercalations and other soils with small and medium strain. The correction model parameters are impacted by clay content (strongly), water content (strongly) and confining pressure (weakly). When frequency is excessive, the dynamic damping ratio is correlated with the small and medium dynamic strain (positive), confining pressure (initially positive and then negative), and water content (negative); no significant correlation with clay content was detected.
Highlights Experimentally identifying the attenuation behaviour of small-strain dynamic damping ratio of mudded intercalations. Formulating a correction Hardin-Drnevich model to describe the small-strain dynamic damping ratio properties. Revealing the impact factors of the small-strain dynamic damping ratio of mudded intercalations along with their impacts. The healing of damage has a great influence on the small-strain dynamic damping ratio properties of mudded intercalations
Dynamic damping ratio of mudded intercalations with small and medium strain during cyclic dynamic loading
Qin, Yaguang (author) / Xu, Xiao (author) / Yan, Changbin (author) / Wen, Lei (author) / Wang, Zhuo (author) / Luo, Zhouquan (author)
Engineering Geology ; 280
2020-12-03
Article (Journal)
Electronic Resource
English
Geotechnical dynamics , Dynamic triaxial test , Mudded intercalations , Correction Hardin-Drnevich model , Dynamic damping ratio , Small and medium strain , <italic>λ</italic> <inf>d</inf> , <italic>λ</italic> <inf>dmax</inf> , The maximum dynamic damping ratio , <italic>λ</italic> <inf>dmin</inf> , The minimum dynamic damping ratio , <italic>G</italic> <inf>d</inf> , Dynamic shear modulus, MPa , <italic>G</italic> <inf>d0</inf> , Initial dynamic shear modulus, MPa , <italic>γ</italic> <inf>d</inf> , Dynamic shear strain , <italic>γ</italic> <inf>dr</inf> , Reference dynamic shear strain , <italic>ε</italic> <inf>d</inf> , Dynamic strain , <italic>ε</italic> <inf>dr</inf> , Reference dynamic strain , <italic>σ</italic> <inf>d</inf> , Dynamic loading, kPa , <italic>τ</italic> <inf>d<italic>f</italic></inf> , Dynamic strength, kPa , <italic>μ</italic> <inf>d</inf> , Dynamic Poisson's ratio , <italic>N</italic> , Cycle number , Δ<italic>W</italic> <inf>d</inf> , Total energy lost during a single cycle of dynamic loading , <italic>W</italic> <inf>d</inf> , Total energy stored during a single cycle of dynamic loading
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