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Cyclic and postcyclic simple shear behavior of binary sand-gravel mixtures with various gravel contents
Abstract The effect of gravel contents on the cyclic and post-cyclic monotonic simple shear behavior of gravelly soils during seismic events has significant implications for civil infrastructure. Large-scale cyclic simple shear tests and post-cyclic monotonic simple shear tests were performed on gravelly soils with different levels of gravel content (GC) and loading conditions. The test results indicated that the GC of a sand-gravel mixture (SGM) profoundly influences the mixture's cyclic simple shear characteristics. The SGM specimen with the lowest GC had the broadest hysteresis loops. The shear modulus of the SGM specimens differing in GC was found to increase with increasing cyclic number. The increase in shear modulus was more pronounced during the first 10 cycles. The damping ratio of the SGM decreased to some extent as the cyclic loadings increased. Overall, the results suggested a modified relationship between the damping ratio and shear modulus. The modified function accurately represented the relationship between the normalized damping ratio and the normalized secant shear modulus for SGMs varying in GC. Shear strain obviously decreased with the number of cycles during the initial cyclic loadings, when loading frequency was low. However, at a higher loading frequency, shear strain was less affected by the number of cycles. In general, the inclusion of gravel particles slightly reduced the post-cyclic monotonic shear resistance.
Highlights The SGM specimen with the lowest gravel content had the broadest hysteresis loops. The increase in shear modulus with cyclic numbers was pronounced at first 10 cycles. Proposed an improved function related the damping ratio and shear modulus. The cyclic loading frequency has more effects on the initial hystersis loops. Post-cyclic monotonic shear resistance slightly reduced with inclusion of gravels.
Cyclic and postcyclic simple shear behavior of binary sand-gravel mixtures with various gravel contents
Abstract The effect of gravel contents on the cyclic and post-cyclic monotonic simple shear behavior of gravelly soils during seismic events has significant implications for civil infrastructure. Large-scale cyclic simple shear tests and post-cyclic monotonic simple shear tests were performed on gravelly soils with different levels of gravel content (GC) and loading conditions. The test results indicated that the GC of a sand-gravel mixture (SGM) profoundly influences the mixture's cyclic simple shear characteristics. The SGM specimen with the lowest GC had the broadest hysteresis loops. The shear modulus of the SGM specimens differing in GC was found to increase with increasing cyclic number. The increase in shear modulus was more pronounced during the first 10 cycles. The damping ratio of the SGM decreased to some extent as the cyclic loadings increased. Overall, the results suggested a modified relationship between the damping ratio and shear modulus. The modified function accurately represented the relationship between the normalized damping ratio and the normalized secant shear modulus for SGMs varying in GC. Shear strain obviously decreased with the number of cycles during the initial cyclic loadings, when loading frequency was low. However, at a higher loading frequency, shear strain was less affected by the number of cycles. In general, the inclusion of gravel particles slightly reduced the post-cyclic monotonic shear resistance.
Highlights The SGM specimen with the lowest gravel content had the broadest hysteresis loops. The increase in shear modulus with cyclic numbers was pronounced at first 10 cycles. Proposed an improved function related the damping ratio and shear modulus. The cyclic loading frequency has more effects on the initial hystersis loops. Post-cyclic monotonic shear resistance slightly reduced with inclusion of gravels.
Cyclic and postcyclic simple shear behavior of binary sand-gravel mixtures with various gravel contents
Xu, Dong-sheng (Autor:in) / Liu, Hua-bei (Autor:in) / Rui, Rui (Autor:in) / Gao, Yuan (Autor:in)
Soil Dynamics and Earthquake Engineering ; 123 ; 230-241
25.04.2019
12 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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