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Identification and imaging of soil and soil-pile deformation in the presence of liquefaction

M. Zeghal1, P. V. Kallou2, C. Oskay3, T. Abdoun1 and M. K. Sharp4

  1. Dept. of Civ.and Env. Engrg.,Rensselar Polytechnic Institute, Troy NY l2l80, USA
  2. Mueser Rutledge Consulting Engineers, 225 W 34th Street, New York, NY 10122, USA
  3. Dept. of Civ. and Env. Engrg., Vanderbilt University, Nashville, TN 37235, USA
  4. Centrifuge Research & Development Center, Vicksburg, MS 39180, USA

Abstract: A simple identification technique is developed to visualize the dynamic deformation mechanisms of centrifuge models of saturated soil and soil-pile systems using the measurements provided by sparsely distributed sensors. Cross-correlation analyses are employed first to assess the variation of shear wave velocity profile with time as soil experiences stiffness reduction and degradation during dynamic excitations. The corresponding time-dependent modal configurations are determined using the finite-element technique. These configurations are used along with recorded motions to evaluate optimal time histories of displacement and strain fields based on a spectral motion reconstruction. Visualizations of the response of infinite slope and soil-pile centrifuge models revealed salient and complex multi-dimensional deformation patterns, especially at high pore pressure ratios. The developed technique provides an effective tool to visualize and analyze the dynamic response of centrifuge, shake-table and field soil systems.

Keywords: soil dynamics; liquefaction; visualization; centrifuge model

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Copyright 2009 IEM. Journal of Earthquake Engineering and Engineering Vibration. All Rights Reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, scanning or otherwise, except as described below, without written permission from the Publisher. Copying of articles is not permitted except for personal and internal use, to the extent permitted by national copyright law, or under the terms of a license issued by the National Reproduction Rights Organization of China.