DYNAMIC CENTRIFUGE SHAKING TABLE TESTS AND NUMERICAL SIMULATION OF AN UNCONFINED SANDY FOUNDATION

Dynamic centrifuge shaking table tests of an unconfined sandy foundation are conducted under 50g gravitational fields in Tsinghua University. The tests were performed using a laminar shear box with plan dimensions of 0.5 m and 0.2 m, and the experiment system is subjected to strong ground motions Kobe wave and Parkfield wave. In this paper, the study focuses on the dynamic responses of accelerations and displacements. Also, the numerical simulation of the system is conducted. The match of experiment and numerical responses in both frequency and time domain are satisfying. Meanwhile, the main features of dynamic responses of the unconfined sandy foundation which are apparent in the experiment are captured by the numerical simulation, and the test results served as basis for calibration and validation of numerical models of the system.