00715540

Component

http://onlinepubs.trb.org...trr/1995/1504/1504-003.pdf

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

Many of the damages caused to structures during earthquakes are due to the failure of sand foundations. Experience in past earthquakes showed that poorly designed sand foundations can cause large vertical settlement and tilting to buildings. However, research efforts are complicated by the lack of field data about the responses of foundations during earthquakes. Centrifuge modeling has the advantage of being able to replicate field events in a controllable environment. For earthquake centrifuge tests, the boundary effects imposed by a model container need to be addressed carefully. A group of dynamic centrifuge tests was conducted at Cambridge University to study the seismic stability of sand foundations. The tests were conducted in a specially designed model container that could simulate a soil layer of infinite lateral extent. A large data base was established, which can be used for the verification of design calculations and validation of numerical procedures. Failure mechanism similar to that which occurred in the field was observed in the tests. When sand in the foundation was saturated, the risk of failure was significantly increased. There was clear indication of deterioration of the stiffness of sand under cyclic loading and with pore pressure increase. Implications for design are discussed.

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. 22-33

1995

Transportation Research Record

0309061725

Figures (13) ; Photos (1) ; References (10)

Centrifuges; Deterioration; Dynamic models; Earthquakes; Failure; Foundations; Loss and damage; Pore pressure; Repeated loads; Sand; Seismicity; Stability (Mechanics); Stiffness

Damages; Model tests; Seismic response

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 FLOWSLIDES CAUSED BY STATIC LOADING
• 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