Centrifugal Model Test and Numerical Simulations on the Seismic Behavior of Landfill Ground Consisting of Rock Debris Under Embankment

Abstract

Landfill ground consisting of rock debris has been treated as ground that is resistant to liquefaction. However, in recent years, the number of cases requiring stability evaluation that considers the effects of liquefaction is increasing due to the increase in design seismic ground motion. In this study, we conducted a centrifugal model test and its numerical simulations on the seismic behavior of rock debris under conditions in which a 10 m-high cement-improved embankment was constructed on a 15 m-deep rock debris landfill ground. In the numerical analyses, two types of effective stress analysis codes, one for undrained conditions and the other for drained conditions, were used. As a result, it was clarified that the effective stress analysis method of the drainage condition was more consistent with the test results, because rock debris had a greater effect on permeability and dilatancy than sand.