Dynamic Centrifuge Modelling Tests for Asphalt Concrete Core Dam

Abstract

Dynamic centrifuge modelling tests are carried out to study the seismic behaviour of a sand-gravel dam with asphalt concrete core wall. The acceleration response, deformation, core wall stress and stability are analysed under design and check seismic intensity. The crest acceleration amplification factor is 2.7~3.0. The crest settlement rate is 0.442% and 0.481%, respectively under design and check intensity. Maximum seismic stress is recorded in core wall of 2/3~4/5 dam height. Under design intensity, failure cracks appear in crest and upstream dam revetment at water level. Under check intensity, more cracks are found. Furthermore, landslide occurs in upstream slope above 2/3 dam height under check intensity. Downstream slope is stable. No evident separation is observed between dam shell materials and core wall. The dam is unstable under design and check earthquake. Aseismic measures are necessary according to test results.