LIQUEFACTION STUDIES IN THE CENTRIFUGE

12/11/98

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Table of Contents

LIQUEFACTION STUDIES IN THE CENTRIFUGE

Research outline:

Liquefaction phenomenon was best illustrated in the Niigata and the Alaska earthquakes of 1964, where severe damage was done.

INTRODUCTION AND PROBLEM STATEMENT

WHY THE ENERGY BASED METHOD?

WHY CENTRIFUGE MODELING?

Developing equations relating the energy per unit volume required for liquefaction.

BACKGROUND AND REVIEW

REVIEW OF PREVIOUS RESEARCH RELATED TO THE ENERGY CONCEPT TO LIQUEFACTION

Liang (1995) conducted strain-controlled torsional triaxial experiments on hollow cylinder of sand to examine the effects of relative density, initial confining pressure and shear strain amplitude.

EARTHQUAKE CENTRIFUGE MODELING

EXAMPLE OF SIMULATING A REAL EARTHQUAKE MOTION

CWRU Centrifuge

CWRU Centrifuge Control Room

Centrifuge Design

SPECIFICATIONS OF THE SHAKER

The Electro-hydraulic shaker

CWRU Laminar Box and Shake Table

CWRU Centrifuge Control Screen

Earthquake simulation system

CWRU Laminar Box

The surface of the base plate is made rough to provide good coupling with the test specimen.

Preloading the laminar box

CWRU Laminar Box

TIME SCALING FOR DIFFUSION IN DYNAMIC MODELING

DATA PROCESSING AND CALCULATIONS

RESEARCH APPROACH

EXPERIMENTAL PROGRAM

Preparation of Sand for Centrifuge Modeling

Controlling density Calibration test

Lubrication of soil container

Preparation of dry sand model

Saturation process

Determination of the Liquefaction Potential of a soil Deposit by the Energy Method

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