Pore Pressure Responses of Liquefied Numerical Sand Columns

• DOI: 10.22146/jcef.3395
• Publication Date: 2022-07-29T04:10:22Z
• Authors: Widjojo Prakoso; Dheya Mazaya; Rumaisha A. Kartika
• Keywords: OpenSees; Soil liquefaction

The Palu 28 September 2021 M 7.5 Earthquake has brought several new challenges to the understanding of liquefaction and its following geotechnical phenomena. In addition, that main shock was followed by a series aftershocks within short time frame. common conditions area include layered soils conditions, associated variability exists. This paper reports dynamic effective stress analysis (ESA) study four different liquefiable sand columns, above three (layered soils, variability, aftershocks) are explicitly modeled. ESA employs PM4Sand constitutive model for sands, implemented in OpenSees platform. Three ground motion sets (“main only”, “main plus aftershock”, “aftershock” only) variable amplitude, single frequency harmonic motions used. models validated comparing qualitatively their results against laboratory test field measurements. saturated layers all cases subjected only” liquefied with detailed excess pore pressure (EPP) responses, highlighting importance system response liquefying columns. aftershock” show much longer higher EPP state, while both “aftershock indicate state during aftershock. implication duration is lower shear strength would exist. responses resulted from represented columns suggest have an important influence on response.