Abstract: Extrusion side wall as a construction technique used in the upstream slope of rock-fill dam with concrete panel has been widely used in many projects. To understand the static and dynamic effect of extruded side wall acting on the rock-fill dam with concrete panel, 2-D models of typical section of a concrete-faced rockfill dam are built, which contain the real extruded side wall and the extruded side wall with an equivalent thickness. The stress state and deformation state using the original construction method and the extruded side wall technique are compared and analyzed by non-linear finite element calculation. The rationality of extruded side wall’s approximate treatment with an equivalent thickness is verified. Moreover, the effect of extruded side wall on the stress and deformation of panel and rock-fill body is researched. It’s concluded that extruded side wall reduces the deflection deformation and stress of panel during construction finishing period and impounding period, but has no apparent impact on rock-fill body. It makes the project safer and more economical, and is worth popularization.

Key words: extruded side wall, concrete-faced rock-fill dam, FEM, stress and deformation