00715539

Component

http://onlinepubs.trb.org...trr/1995/1504/1504-002.pdf

https://scholar.google.co...yrne&publication_year=1995

The phenomenon of liquefaction can occur in saturated loose sands and is characterized by a large strength or stiffness loss resulting in substantial deformation or a flowslide when subjected to rapid static or cyclic loading. To study this phenomenon, the Canadian geotechnical engineering community has started the Canadian Liquefaction Experiment (CANLEX), which has planned to include a large, controlled liquefaction event in the field. Numerical predictions of the response of this full-scale event will be compared with the field measurements. Centrifuge model tests are being conducted to aid in the design of the field event and to allow for calibration of numerical models. These tests could serve as a substitute for calibration of numerical models in the event that a dynamic field event is not possible or not conducted at the site. The first of these tests ascertained that a gravitational flowslide event could be induced under undrained static loading. A surcharge dropped on the crest of an equivalent 16-degree submerged 8.8-m-high slope of loose oil sand tailings caused the slope to liquefy and flow with deep-seated lateral movements throughout the soil slope to an angle of 7 degrees. A finite difference numerical model, calibrated against laboratory element test data, captured the essence of the observed undrained response of the centrifuge test in terms of pore pressure rise and deformation pattern. These modeling techniques will be used to evaluate other triggering mechanisms for the field event.

This paper appears in Transportation Research Record No. 1504, Modeling and Model Verification; Testing Pavement Layers and Materials; and Low-Cost Drainage Structures. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

01399829

English

p. 12-21

1995

Transportation Research Record

0309061725

Figures (13) ; References (14) ; Tables (2)

Calibration; Centrifuges; Deformation; Dynamic models; Liquefaction; Mathematical models; Pore pressure; Prototype tests; Sand; Soils; Static loads

Model tests; Numerical models

Geotechnology; Highways; I42: Soil Mechanics

TRIS, TRB

Jan 2 1996 12:00AM

• CENTRIFUGAL MODELING OF LEAKING UNDERGROUND STORAGE TANKS
• DETERMINATION OF DEPTH TO BEDROCK FROM FALLING WEIGHT DEFLECTOMETER TEST DATA
• DETERMINATION OF RESILIENT MODULUS OF SUBGRADES USING BENDER ELEMENTS
• ESTIMATING PERMEABILITY OF ASPHALT-TREATED BASES
• METHODOLOGY FOR FUNCTIONAL DESIGN OF LOW-LEVEL RIVER CROSSINGS IN SOUTH AFRICA
• MODELING THE STABILITY OF SAND FOUNDATIONS DURING EARTHQUAKES
• PORTABLE CROSSINGS FOR WEAK SOIL AREAS AND STREAMS
• RESILIENT PROPERTIES OF LABORATORY COMPACTED SUBGRADE SOILS
• RESPONSE OF PAVEMENT SYSTEMS TO DYNAMIC LOADS IMPOSED BY NONDESTRUCTIVE TESTS
• SHEETPILE CELL FILLING: FINITE ELEMENT MODEL VERIFICATION FOR TWO CASE HISTORIES
• TESTING AND MODELING OF TWO ROCKFALL BARRIERS