Simulation Analyses of Seismic Tests of a Pile-Supported Structurein Liquefiable Sand Using Large-Scale Blast Excitation

摘要

Seismic tests have been conducted on a pile-supported structure in a liquefiable sand deposit using ground motionsgenerated from large mining blasts. This paper presents simulation analyses of the seismic tests.A 2-D finite element model (2-D FEM) was constructed and response analyses considering effective stresses wereperformed to simulate responses of the sand deposit and the adjacent free field. The analysis results confirmed that theeffective stress analysis method could simulate the nonlinear behavior of a sand deposit under liquefaction.A beam-interaction spring model was used to simulate the dynamic behavior of the pile-supported structure. The inputmotions to the beam-interaction spring model were obtained from the effective stress analyses using 2D-FEM. Comparisonof the analysis results and the test results confirmed that the beam-interaction spring model employed here simulated thedynamic behaviors of the soil-pile-structure system very well.