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
