Location

San Diego, California

Session Start Date

5-24-2010

Session End Date

5-29-2010

Abstract

In this paper, the pyhsical model tests which were carried out in the laboratory on uniform sand columns, silt inter layered sand columns and two layered sand columns deposited at various relative densities and subjected to different input accelerations are numerically modelled. The numerical analyses are performed by using Towhata-Iai liquefaction model in a finite element program called DIANA and the excess pore water pressures computed from the numerical analyses are compared with the experimental results. The numerical analyses have shown that the development of excess pore water pressures is highly influenced by the relative density of the sand and the presence of a less permable soil layer within the sand deposit. The numerical modeling of silt interlayered sand tests showed that there is an abrupt increase in the ru values below the silt seam demonstrating the accumulation of pore water pressures due to the presence of silt layer. The results of the numerical analyses also revealed that a constitutive model coupled with a ground water flow analysis must be used to simulate the generation of excess pore water pressures especially in layered sand deposits.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Meeting Name

Fifth Conference

Publisher

Missouri University of Science and Technology

Publication Date

5-24-2010

Document Version

Final Version

Rights

© 2010 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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May 24th, 12:00 AM May 29th, 12:00 AM

Numerical Modeling of Liquefaction in Layered and Silt Inter Layered Sands

San Diego, California

In this paper, the pyhsical model tests which were carried out in the laboratory on uniform sand columns, silt inter layered sand columns and two layered sand columns deposited at various relative densities and subjected to different input accelerations are numerically modelled. The numerical analyses are performed by using Towhata-Iai liquefaction model in a finite element program called DIANA and the excess pore water pressures computed from the numerical analyses are compared with the experimental results. The numerical analyses have shown that the development of excess pore water pressures is highly influenced by the relative density of the sand and the presence of a less permable soil layer within the sand deposit. The numerical modeling of silt interlayered sand tests showed that there is an abrupt increase in the ru values below the silt seam demonstrating the accumulation of pore water pressures due to the presence of silt layer. The results of the numerical analyses also revealed that a constitutive model coupled with a ground water flow analysis must be used to simulate the generation of excess pore water pressures especially in layered sand deposits.