Three dimensional analysis of the aseismatic stability of high earth-rockfill dam on deep overburden

Conventional quasi-static method can not take into consideration the effect of dynamic behaviour of high earth-rockfill dam on deep overburden.The aseismatic stability of dam should be evaluated by the safety factor of material's dynamic strength,the permanent deformation after the earthquake and the slope stability during the earthquake.In this paper,the dynamic behavior of a real high earth-rockfill dam on deep overburden is studied by three dimensional nonlinear dynamic finite element analysis in detail.The result shows that in overburden layer the high seismic acceleration distribution coefficient locates at one third height from the dam crest.And below this height,the maximum response acceleration is similar or smaller than the maximum input value.It is also founded that during the earthquake process,the most dangerous slide surface is moved gradually from the original position to the dam crest.