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Engineering Geology | 1993

Observed and predicted earthquake response of La Villita Dam

Mohamad F. Succarieh; Ahmed-W. Elgamal; Liping Yan

Abstract La Villita earth and rockfill dam in Mexico has been subjected to five major earthquakes during the period 1975–1985. The recorded time histories of crest acceleration and associated permanent displacements imply the occurrence of seismically induced localized stick-slip slope deformations. In this paper, the upstream-downstream seismic response of La Villita dam is investigated in detail. The dam vibration characteristics are represented by a one-dimensional shear-wedge elasto-plastic numerical model. Available bedrock acceleration histories are employed as input excitation and seismic response is calculated using a step-by-step time integration procedure. Crest acceleration histories are computed and further employed to predict the observed permanent displacements. For that purpose, an elastic-perfectly plastic single-degree-of-freedom (SDOF) model is used in a Newmark-type sliding mass analysis. The predicted SDOF permanent displacements are found to be similar to their recorded counterparts. Moreover, this yielding SDOF model is found to capture the peculiar asymmetric response characteristics associated with the evolution of stick-slip displacements, and observed in the recorded crest accelerations of La Villita Dam. Finally, the employed numerical procedures are found to demonstrate the possible development of additional permanent crest displacements during future seismic events.


Archive | 1994

Interlaboratory Studies to Evaluate the Repeatability of Dynamic Centrifuge Model Tests

K. Arulanandan; Ricardo Dobry; Ahmed-W. Elgamal; H. Y. Ko; B. L. Kutter; J. Prevost; M. F. Riemer; A. N. Schofield; R. F. Scott; R. B. Seed; R. V. Whitman; X. Zeng

As part of the VELACS (VErification of Liquefaction Analysis Using Centrifuge Studies) Project, a series of dynamic centrifuge model tests were duplicated at different Universities (U.C. Davis, UC Berkeley, Caltech, Cambridge, Colorado, MIT, Princeton, and RPI) to assess the repeatability of the test results and to provide a data base for a Class A (before the event) type prediction of the test results. This paper will present the results obtained on different centrifuges, the evaluation of the repeatability of the results, and discussions on the use fulness of the results for the validation of constitutive models and numerical procedures. The experience and lessons learnt from this practice show that standardization of dynamic centrifuge modeling is very important in order to achieve repeatability of test results. The results resented here are based on the materials published in a Proceedings of the VELACS Symposium.


Journal of Geotechnical Engineering | 1994

Analysis of Site Liquefaction Using Earthquake Records

Mourad Zeghal; Ahmed-W. Elgamal


Journal of Geotechnical Engineering | 1995

LOTUNG DOWNHOLE ARRAY. II: EVALUATION OF SOIL NONLINEAR PROPERTIES

Mourad Zeghal; Ahmed-W. Elgamal; H. T. Tang; J. C. Stepp


Journal of Geotechnical Engineering | 1996

LIQUEFACTION OF RECLAIMED ISLAND IN KOBE, JAPAN

Ahmed-W. Elgamal; Mourad Zeghal; Ender Parra


Journal of Geotechnical and Geoenvironmental Engineering | 1998

FOUNDATION LIQUEFACTION COUNTERMEASURES FOR EARTH EMBANKMENTS

Korhan Adalier; Ahmed-W. Elgamal; Geoffrey R. Martin


Journal of Geotechnical Engineering | 1995

LOTUNG DOWNHOLE ARRAY. I: EVALUATION OF SITE DYNAMIC PROPERTIES

Ahmed-W. Elgamal; Mourad Zeghal; H. T. Tang; J. C. Stepp


Soils and Foundations | 1996

Analysis of Site Liquefaction and Lateral Spreading Using Centrifuge Testing Records.

Ahmed-W. Elgamal; Mourad Zeghal; Vm Taboada; Ricardo Dobry


Journal of Geotechnical Engineering | 1996

FORCED VIBRATION OF FULL-SCALE WALL-BACKFILL SYSTEM

Ahmed-W. Elgamal; Sreenivas Alampalli; P. Van Laak


Earthquake Engineering & Structural Dynamics | 1991

Shear hysteretic elasto-plastic earthquake response of soil systems

Ahmed-W. Elgamal

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Korhan Adalier

Rensselaer Polytechnic Institute

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Mourad Zeghal

Rensselaer Polytechnic Institute

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Ricardo Dobry

Rensselaer Polytechnic Institute

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H. T. Tang

Electric Power Research Institute

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B. L. Kutter

University of California

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H. Y. Ko

University of Colorado Boulder

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K. Arulanandan

University of California

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Liping Yan

California Institute of Technology

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