Abstract
The practical constitutive model UBCSAND2, which combines two-mobilized planes—a maximum shear stress plane and a horizontal plane within a framework of classical plasticity approach—is used to incorporate shear-induced effects in both loading and unloading as well as principal stress rotation effects. UBCSAND2 was calibrated by capturing cyclic direct simple shear (CDSS) test results of Pohang sand, which was collected from liquefied paddy fields due to the 2017 Pohang earthquake (Mw = 5.4) in South Korea. The model procedure focuses on simple shear condition because it best simulates field conditions under earthquake loading. The calibrated UBCSAND2 model is then used to assess the liquefaction-induced damages that occurred at the quay wall and backfill layer in Youngil-man port near the epicenter of the Pohang earthquake. The numerical results show that liquefaction mostly occurred in silty sand layers, in which the excess pore pressure ratio reached almost one. The estimated displacements of the quay wall and the predicted settlement of reclaimed area obtained from the analysis were in good agreement with those obtained from field measurements.
Highlights
Earthquake-induced liquefaction is one of the primary causes of major damages to geotechnical structures under saturated soil conditions
K0 is in the range of 0.2–0.4, and α ranges from 0.05 to approximately 0.1
Since widespread damages on geotechnical structures caused by liquefaction during the
Summary
Earthquake-induced liquefaction is one of the primary causes of major damages to geotechnical structures under saturated soil conditions. To date a reliable prediction of liquefaction-resulted displacements that developed in the plasticity formulation has still been challenging. Beaty and Perlea [2] pointed out these challenges should be considered when choosing and applying a constitutive model for a finite element analysis to predict liquefaction, which include:. The fully coupled effective stress model is considered to be the most sophisticated class of continuum models of liquefaction [2]. Another one of the conventional models that has been widely used in earthquake engineering applications (e.g., dams, bridges, buildings, and ports) is the UBCSAND model. A major advantage of this model is its relative simplicity in predicting
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