LEAP-ASIA-2019 Centrifuge Test at KAIST

Abstract

AbstractSince Niigata and Alaska earthquakes in 1964, the dangers of liquefaction are well established, and research into liquefaction has been actively performed. In this context, Liquefaction Experiments and Analysis Projects (LEAP) was launched to provide high-quality experimental data on soil liquefaction using laboratory testing and centrifuge modeling and then validating numerical models to improve predictions. The purpose of LEAP-ASIA-2019, which is one of the LEAP programs, was to fill the gaps and further extend/establish/confirm the trends obtained in the previous LEAP-UCD-2017 program. Further, the validity of the generalized scaling law was also tested for liquefaction simulation using different 1-g and centrifuge scaling factors. During LEAP-ASIA-2019, KAIST performed two model tests (Model A and Model B) with the same target relative density (Dr = 85%) and input motion intensity of 0.3g. Models A and B were identical in construction but were tested under different centrifugal accelerations to verify the generalized scaling factors. This paper describes the experimental procedure in detail and the responses of dense model grounds to strong base shaking in terms of ground accelerations, excess pore pressure, surface displacements, stress-strain behavior, and CPT profiles. Further, discussion on the generalized scaling law and the effect of shaking history on the model behavior are also presented.