Location

San Diego, California

Session Start Date

3-26-2001

Session End Date

3-31-2001

Abstract

Liquefaction is one of the most important, complex and controversial topics in geotechnical earthquake engineering. Since Niigata earthquake in 1964, it has been popularly recognized that the liquefaction induced ground failures cause severe damage to the built environment. To take measures against such damage, understanding the mechanism of liquefaction and its associated phenomena from macroscopic and microscopic viewpoints is very important. There are two approaches, which are experimental and numerical ones, to study them. Although discussion from the macroscopic viewpoints can be done by experiments, it is not so easy to perform experiment to obtain microscopic information on liquefaction and its associated phenomena. Among the numerical tools available at present, Distinct Element Method (DEM) is an effective method that can simulate the mechanism of liquefaction at microscopic level. We have developed a new 3-D DEM model with a simple algorithm by which the effect of pore water and its behavior can be directly considered to improve the mechanical behavior of the particles. Conventionally, these effects were not considered in the field of DEM. Our primary objective in this paper is to simulate the hollow cylindrical torsion test, which replicates the ground condition before and during the earthquake, under undrained and cyclic loading conditions using the proposed model.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

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

Meeting Name

Fourth Conference

Publisher

University of Missouri--Rolla

Publication Date

3-26-2001

Document Version

Final Version

Rights

© 2001 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Mar 26th, 12:00 AM Mar 31st, 12:00 AM

3-D Modeling of Liquefaction Phenomenon Using Distinct Element Method

San Diego, California

Liquefaction is one of the most important, complex and controversial topics in geotechnical earthquake engineering. Since Niigata earthquake in 1964, it has been popularly recognized that the liquefaction induced ground failures cause severe damage to the built environment. To take measures against such damage, understanding the mechanism of liquefaction and its associated phenomena from macroscopic and microscopic viewpoints is very important. There are two approaches, which are experimental and numerical ones, to study them. Although discussion from the macroscopic viewpoints can be done by experiments, it is not so easy to perform experiment to obtain microscopic information on liquefaction and its associated phenomena. Among the numerical tools available at present, Distinct Element Method (DEM) is an effective method that can simulate the mechanism of liquefaction at microscopic level. We have developed a new 3-D DEM model with a simple algorithm by which the effect of pore water and its behavior can be directly considered to improve the mechanical behavior of the particles. Conventionally, these effects were not considered in the field of DEM. Our primary objective in this paper is to simulate the hollow cylindrical torsion test, which replicates the ground condition before and during the earthquake, under undrained and cyclic loading conditions using the proposed model.