Influence on stress and deformation of concrete faced rockfill dam using extrusion-sidewall

The finite element analyses of a concrete faced rockfill dam (CFRD) with and without extrusion-sidewall are carried out using a simplified equivalent numerical model of extrusion-sidewall. Furthermore, a special condition of a CFRD with extrusion-sidewall only on the upper half is considered to investigate the effect of the form of extrusion-sidewall. The analysis is focused on the slab face stress and deformation. Calcalation results show that the distribution of deformation of dam and slab is insignificantly affected by the extrusionsidewall, and the stress of slab and the settlement of the peripheral joint along the face edge are changed because of the adoption of extrusion-sidewall. The extrusion-sidewall has insignificant effect on the safety of the dam.