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Lateral Subgrade Moduli for Liquefied Sand under Cyclic Loading
The load-displacement response of liquefied soils surrounding deep foundations has been investigated previously by conducting lateral load tests on a full-scale 3 x 3 steel pipe pile group embedded in sands liquefied by controlled blasting. Based on this testing, p-y curves for fully liquefied sand were developed which included stiffness degradation due to multiple large-displacement load cycles. Additional study of the soil resistance-displacement time histories used to develop these p-y curves indicates that p-y curves for liquefied sand exhibit a generally linear response during an initial, relatively large-displacement cycle of loading. As the number of loading cycles increases, the stiffness of the soil response decreases, and p-y curves become increasingly shaped concave-up. The shapes of the p-y curves during initial and subsequent loading cycles are markedly different than that of a p-y curve for soft clay in the presence of water. One reason for this difference is that the soft clay model cannot reproduce the effects of contractive/dilative phase transformations. The lateral subgrade modulus for liquefied soil decreases rapidly with the first few loading cycles, losing between 50 to 70% of its initial value by the third cycle for a wide range of deflection levels.
Lateral Subgrade Moduli for Liquefied Sand under Cyclic Loading
The load-displacement response of liquefied soils surrounding deep foundations has been investigated previously by conducting lateral load tests on a full-scale 3 x 3 steel pipe pile group embedded in sands liquefied by controlled blasting. Based on this testing, p-y curves for fully liquefied sand were developed which included stiffness degradation due to multiple large-displacement load cycles. Additional study of the soil resistance-displacement time histories used to develop these p-y curves indicates that p-y curves for liquefied sand exhibit a generally linear response during an initial, relatively large-displacement cycle of loading. As the number of loading cycles increases, the stiffness of the soil response decreases, and p-y curves become increasingly shaped concave-up. The shapes of the p-y curves during initial and subsequent loading cycles are markedly different than that of a p-y curve for soft clay in the presence of water. One reason for this difference is that the soft clay model cannot reproduce the effects of contractive/dilative phase transformations. The lateral subgrade modulus for liquefied soil decreases rapidly with the first few loading cycles, losing between 50 to 70% of its initial value by the third cycle for a wide range of deflection levels.
Lateral Subgrade Moduli for Liquefied Sand under Cyclic Loading
Gerber, Travis M. (author) / Rollins, Kyle M. (author)
Workshop on Seismic Performance and Simulation of Pile Foundations in Liquefied and Laterally Spreading Ground ; 2005 ; University of California, Davis, California, United States
2005-10-31
Conference paper
Electronic Resource
English
Lateral Subgrade Moduli for Liquefied Sand under Cyclic Loading
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