Evaluation Perspectives and Criteria of Maximum Aseismic Capability for High Earth-rock Dam

After Wenchuan earthquake,evaluation of maximum aseismic capability of high earthrock dam is required in China.Till now the comprehensive and thorough evaluation is done from the perspectives of dynamic stability of dam slope,earthquake-induced permanent deformation, liquefaction safety,the stress state in concrete seepage structure,and so on,synthetically by both numerical method and physical model test,and this evaluation method is first applied in Changheba earth core rockfill dam project.Yet at present there are no uniform evaluation criteria,and the reason is found to be that numerical method and physical model test cannot fully simulate the reality,limitation of details of analysis method and earthquake damage information,and researchers′different understanding.New approaches are put forward to decrease the divergence of the criteria,for example,in slope stability analysis,the maximum thickness of the slope is stipulated to be no smaller than 5m,and in stress analysis of concrete cutoff wall,both the compressive strength and tensile strength should be considered,and relevant stress criteria is proposed.New criteria are suggested.