Seismic Guidelines for Earth and Rock Fill Dams

Abstract eng:
In this paper, seismic recommendations for earth and rock fill dams are presented. These recommendations will be included into the Seismic Design Chapter of the seismic design handbook of CFE. The procedure to calculate the seismic loads and to check the dynamic conditions in this kind of structures are explained. These criteria are adapting to the new concepts of seismic hazard of Mexico developed by The Mexican Electric Research Institute and that they will be available in a short time. In the analysis of the earth and rock fill dams are examining and proposing recommendations for the following aspects: dynamic response, seismic stability, seismic permanent deformation, pos seismic stability, pos seismic permanent deformation and other damages, by means of three analysis a) Simplified analysis, b) Analysis in stages and c) Complete analysis. The simplified analysis studies several aspects of the seismic behavior of the dams, since the dynamic response, the seismic stability up to the permanent deformation, using simple procedures. The analysis in stages will begin for the static study, continuing by the dynamic response analysis, and checking the changes that the shear resistance of materials could be suffer, due the generation of pore pressure excess by the accumulation of the residual deformation. Finally, the complete analyses will assemble all the described analyses previously that begin since the static conditions up to analyses a time after the culmination of the earthquake. For the importance that these types of structures and considering that 90 % of the dams in Mexico are of earth and rock fill, the recommendations proposed in this document will be fundamental in the seismic design of the dams.

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