Evaluation of Liquefaction Potential of Impounded Class F Fly Ash
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Date
2013-05
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The Ohio State University
Abstract
The purpose of this study was to evaluate the liquefaction potential of impounded Class F fly ash and compare the results to a 2005 study at the Ohio State University by Zand et al. A computer ground response analysis program, SHAKE, was used to obtain the cyclic stress ratios and equivalent number of cycles during several variations of a design earthquake. The profiles are based upon an actual impounded fly ash unit at an American Electric Power (AEP) plant. Cyclic triaxial tests were also performed on reconstituted specimens. The tests were performed at varying cyclic stress ratios, sample densities, and confining stresses. The results of the computer analyses were compared with laboratory testing which found the design seismic loading to be lower than the cyclic strength of the fly ash. This result is consistent with the 2005 study; however, the correlation between confining stress and liquefaction potential was not.
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Keywords
fly ash, liquefaction, ground response analysis, shake