CENTRIFUGE MODELING TEST OF DYNAMIC RESPONSE AND DEFORMATION LAW OF CONCRETE-FACED ROCKFILL DAM

The study on dynamic response of CFRD due to earthquake is presented using 50g-t centrifuge shaking table in Tsinghua university subjected to Parkfield earthquake.The experiment is conducted under the 50g condition. Acceleration time histories are recorded by acceleration transducer at different locations on the model and the deformation of the face-slab is also measured. The vibration response and deformation law of CFRD is studied by changing the intensity of seismic wave and water depth.The results show that the CFRD response is amplified as the seismic wave propagates upwards through the dam. The response of the zone adjacent to the upper and lower dam is greater than that of the internal dam.Significant stress and strain occur during the earthquake: compressive stress occurs on the upper part of the face slab while tensile stress occurs on its lower part; it occurs flexural torque on the middle part of the face slab. The acceleration response and the displacement distribution of the dam as well as the stress and deformation of the face slab don't alter by changing the magnitude of the seimic wave,but the increase of the intensity of the seimic wave will decrease the acceleration amplification of the wave.The earthquake acceleration response can be weakened by impounding which can increase the deformation of the dam and face slab.