Numerical Simulation of Seismic Response of a Cantilevered Sheet-Pile Wall with Liquefiable Backfill Sand
Publication: Geo-Congress 2022
ABSTRACT
This paper presents numerical predictions for a dynamic centrifuge test of a submerged cantilevered sheet-pile wall retaining a liquefiable backfill. The numerical analysis was performed using PM4sand model in FLAC2D. The PM4sand model was calibrated for a liquefaction strength based on cyclic torsional shear tests, while the modulus reduction at larger shear strains (γ > 1%) was calibrated based on an empirical G/Gmax curve. The wall rotation was driven by shear failure in the backfill due to excess pore pressure buildup. The use of relative density (Dr) estimated from measured cone penetration resistance over Dr from mass and volume measurements resulted in a better prediction of liquefaction triggering and wall rotation. There was a further improvement in the predicted wall rotation when the degradation of elastic shear modulus at large shear strains fitted the empirical curve. However, the post-liquefaction backfill settlement could not be predicted accurately due to limitation of the PM4sand model.
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Geo-Congress 2022
Pages: 329 - 338
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Published online: Mar 17, 2022
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