Characteristics Analysis of Permanent Earthquake-induced Deformation of High Core Rock-fill Dam

Permanent earthquake-induced deformation of dam engineering is one of the most important factors to control the safety of high earth-rockfill dam.Taking the 200-meters high core rock-fill dam for an example,the IWHR model is applied to establish the relationships between dynamic stress and residual strain on rock-fill materials and core wall materials.Based on the static and dynamic three-dimensional finite element analysis,the characteristics and distribution of the permanent deformation in different dynamic parameters,peak acceleration and response spectrum are discussed by using equivalent nodal force method.The results show that the contour maps of permanent deformation is almost the same under the single parameter change;maximum vertical permanent deformation occurs near the top of the dam;however,the values are different,especially in the region 1/3 to 1/2 height of the dam near the dam crest.Among these factors,peak acceleration and the selection of modulus decay curve and damping growth curve have large impact on the results.