Constitutive Modelling of Liquefaction and Computer Implementation Using Nonlinear Finite Element Analysis
Date27th Feb 2024
Time04:00 PM
Venue Conference Room (BSB 104)
PAST EVENT
Details
Engineers must adopt modern construction technology and pace up structural and substructural constructions to fulfil the demand for rapid urbanization. In this process, the engineers might confront several difficulties, among them, one severe issue might be the presence of liquefiable soil deposits in the urban areas. Seismic liquefaction, an earthquake associated phenomena is a major concern especially in the upcoming urbanized cities in seismically active zones. The assessment of liquefaction potential of soils during earthquake is an important activity and a prerequisite for adopting suitable liquefaction mitigation measures. In the last few decades, many advanced constitutive models and numerical tools have been developed to understand the liquefaction phenomena, however more studies need to be attempted in the area of liquefaction potential assessment. Over the years, these constitutive models have been calibrated using advanced experimental facilities for liquefaction potential assessment. The confidence to certify one such constitutive model as the best to simulate the liquefaction is not yet established and seems to be a challenging task. In the present study, an attempt will be made to evaluate the liquefaction potential of sandy deposits using advanced constitutive relations within the framework of a nonlinear finite element analysis (FEA). A post liquefaction behavior is also proposed to be analyzed as part of the current study. Seismic response analysis of embankment constructed on liquefiable sandy deposits will be attempted considering site-specific spectrum compatible ground motions. In this seminar, a detailed review of literature is presented in the beginning followed by a critical appraisal, objectives of the current investigation and methodology to be adopted for the present study. As a preliminary study, the UBC3D-PLM model has been calibrated with laboratory test results performed on Fraser River sand and validated using the results obtained from the centrifuge tests. An attempt has also been made to evaluate the seismic response of embankment constructed on the liquefiable sandy deposits.
Speakers
Mr. Shiladitya Mandal
Department of Civil Engineering