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Seismic Response of Shallow Foundations Resting on Liquefiable Sand
In this study, the seismic response of shallow foundations resting on a liquefiable soil layer is modeled using a coupled smoothed particle hydrodynamics (SPH)-discrete element method (DEM) scheme. In this framework, the soil deposit is represented by an assembly of DEM particles, and the fluid domain is lumped into a set of SPH particles carrying local fluid properties. The averaged forms of Navier-Stokes equations dictate the motion of the fluid-particle mixture, and the interphase forces are estimated using well-known semi-empirical equations. A saturated soil-foundation system with an average contact pressure of 50~kPa was created using the coupled scheme. The foundation block was composed of a collection of DEM particles glued together by high-stiffness bonds. No-penetration boundary condition was applied to all sides of the foundation block to allow for fluid-foundation interaction. The model was subjected to a strong base acceleration, and the response was analyzed and compared to the free-field. The obtained results indicate that ground settlement in the soil-foundation system mostly originated from co-seismic deviatoric deformations, while volumetric strains were the main contributing factor at the free-field. In addition, unlike the soil-foundation system, a large part of the free-field settlement occurred post-shaking.
Seismic Response of Shallow Foundations Resting on Liquefiable Sand
In this study, the seismic response of shallow foundations resting on a liquefiable soil layer is modeled using a coupled smoothed particle hydrodynamics (SPH)-discrete element method (DEM) scheme. In this framework, the soil deposit is represented by an assembly of DEM particles, and the fluid domain is lumped into a set of SPH particles carrying local fluid properties. The averaged forms of Navier-Stokes equations dictate the motion of the fluid-particle mixture, and the interphase forces are estimated using well-known semi-empirical equations. A saturated soil-foundation system with an average contact pressure of 50~kPa was created using the coupled scheme. The foundation block was composed of a collection of DEM particles glued together by high-stiffness bonds. No-penetration boundary condition was applied to all sides of the foundation block to allow for fluid-foundation interaction. The model was subjected to a strong base acceleration, and the response was analyzed and compared to the free-field. The obtained results indicate that ground settlement in the soil-foundation system mostly originated from co-seismic deviatoric deformations, while volumetric strains were the main contributing factor at the free-field. In addition, unlike the soil-foundation system, a large part of the free-field settlement occurred post-shaking.
Seismic Response of Shallow Foundations Resting on Liquefiable Sand
El Shamy, Usama (author) / Farzi Sizkow, Saman (author)
Geo-Congress 2023 ; 2023 ; Los Angeles, California
Geo-Congress 2023 ; 236-245
2023-03-23
Conference paper
Electronic Resource
English
Seismic Response of Shallow Foundations Resting on Liquefiable Sand
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