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A platform for research: civil engineering, architecture and urbanism
Modeling the Dynamic Response of a Level Ground Unsaturated Sand Deposit Using a Fully Coupled Finite Element Analysis Procedure
In earthquake prone areas, problems arise from dynamic loading of unsaturated soils. Recent devastating earthquakes in Japan have demonstrated the importance of understanding the seismic behavior of the geotechnical engineering structures found on unsaturated soils. In this paper, the behavior of a level ground deposit of an unsaturated sand subjected to earthquake loading is studied using a fully coupled flow-deformation finite element code with solid displacements, pore water pressure, and pore air pressure as nodal variables. A fully coupled hydro-mechanical elastoplastic constitutive model for unsaturated sands and silts, which includes a hysteretic model for soil water characteristic curves and the hydro-mechanical coupling, is utilized to describe the stress-strain behavior of the unsaturated sand. The simulation results show the occurrence of liquefaction up to a certain depth and the effects of liquefaction such as the damping of surface accelerations. The depth of liquefaction was found to decrease with a decrease in the degree of saturation.
Modeling the Dynamic Response of a Level Ground Unsaturated Sand Deposit Using a Fully Coupled Finite Element Analysis Procedure
In earthquake prone areas, problems arise from dynamic loading of unsaturated soils. Recent devastating earthquakes in Japan have demonstrated the importance of understanding the seismic behavior of the geotechnical engineering structures found on unsaturated soils. In this paper, the behavior of a level ground deposit of an unsaturated sand subjected to earthquake loading is studied using a fully coupled flow-deformation finite element code with solid displacements, pore water pressure, and pore air pressure as nodal variables. A fully coupled hydro-mechanical elastoplastic constitutive model for unsaturated sands and silts, which includes a hysteretic model for soil water characteristic curves and the hydro-mechanical coupling, is utilized to describe the stress-strain behavior of the unsaturated sand. The simulation results show the occurrence of liquefaction up to a certain depth and the effects of liquefaction such as the damping of surface accelerations. The depth of liquefaction was found to decrease with a decrease in the degree of saturation.
Modeling the Dynamic Response of a Level Ground Unsaturated Sand Deposit Using a Fully Coupled Finite Element Analysis Procedure
Zhang, Bo (author) / Muraleetharan, Kanthasamy K. (author)
Second Pan-American Conference on Unsaturated Soils ; 2017 ; Dallas, Texas
PanAm Unsaturated Soils 2017 ; 574-583
2018-06-20
Conference paper
Electronic Resource
English
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