Insights from numerical simulations of liquefaction behaviour within LEAP using the CycLiq model

抄録

The Liquefaction Experiments and Analysis Projects (LEAP) have provided an excellent international collaborative platform for liquefaction research and have stimulated advances in both experimental and numerical modelling. This paper summarizes the findings gained by the Tsinghua University team within the LEAP events from 2017 to 2022 from a numerical simulation perspective. Numerical prediction and simulation of two categories of centrifuge models, mildly sloping ground and sheet pile wall in saturated sand, were performed in four LEAP events during this period at Tsinghua University, using the CycLiq plasticity constitutive model, which was developed with special attention on reflecting soil liquefaction behaviour. Development and calibration of the constitutive model advanced with the accumulation of element test data, from triaxial tests, hollow cylinder torsional shear tests, and direct simple shear tests. These developments have shown to be crucial to improving the prediction capabilities for soil liquefaction for boundary value problems. Two numerical simulation frameworks, OpenSees and FLAC3D, were used for the simulation of the two categories of centrifuge models, respectively. Insights were also gained on key numerical aspects for the successful simulation of the centrifuge tests.