Dynamic interaction of coral sand-pile-superstructure during earthquakes: 3D numerical simulations

Abstract

The seismic safety of piles and superstructures in coral sand deserves attention. To explore the particular dynamic interaction of the coral sand–pile-superstructure during earthquakes, fully nonlinear, 3 D numerical models were established using the Fast Lagrangian Analysis of Continuum (FLAC3D). Hysteresis damping was adopted to indicate the particular stress–strain relationship and shear modulus attenuation of coral sand. The results show that increasing the pile diameter reduces the superstructure settlement but amplifies the bending moment of the piles and superstructures. Specifically, when the pile radius increases from 0.05 m to 0.25 m, the superstructure settlement is reduced by 30.0%, while the moments of the piles and superstructures are increased by an average of 993.9% and 29.5%, respectively. Although the excess pore pressure ratio decreases when the coral sand permeability increases, the pile bending moment increases with an increase in permeability. Effectively balancing the superstructure settlement, pile bending moment and coral sand liquefaction should be considered in the earthquake resistance of coral sand.

Keywords:

• Coral sand
• pile-soil interaction
• dynamic response
• numerical simulation
• liquefaction

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

The research was financially supported by the National Natural Science Foundation of China (Grant No. 51878103, 41831282 and 51778092) and Innovation Group Science Fundation of the Natural Science Fundation of Chongqing, China (Grant No. cstc2020jcyj-cxttX0003).