55 Numerical Modeling for Centrifuge Tests on Large Deformations of Dyke on Liquefiable Soils Available to Purchase

In order to insure the safety of dyke founded on the liquefiable soils in the earthquake prone area, deformation analysis of dyke earthquake-induced is of prime importance. Dynamic centrifuge model tests and numerical predictions were conducted to investigate the seismic behaviors of dyke with a saturated liquefiable foundation in this paper. And detailed discussions and comparisons between numerical modeling and centrifuge tests were included. Centrifuge tests with peak shaking amplitudes of 0.08, 0.18 and 0.32 g in prototype scale were adopted to simulate the seismic performances of dyke on a saturated soil layer foundation with a relative density of about 30%. Effective stress analysis method based on a multiple shear plasticity model was employed for conducting the numerical predictions and validation. Moreover, the computational results for the case of 0.32 g were compared with the test. It is concluded that the measured and computed responses of settlement on the top of dyke, acceleration and excess pore pressure of sand deposit are in good agreement with each other. The physical and numerical models both indicate that the dyke on the liquefiable soils during earthquakes behaves larger settlement and lateral spread. And the stronger the motion, the larger deformation of dyke is. The ratios of excess pore water pressure are smaller in the liquefiable soil beneath the dyke in spite of larger deformations.