Seismic response analysis of a tailing dam foundation composed of discontinuous rock masses and countermeasure design

摘要

The authors report an earthquake response analysis of a tailing dam with a foundation composed of jointed rock masses. The non-linear deformation characteristics of the rock joints are assumed to be combinations of different angles of joint sets using the Multiple Yield Model introduced by Sasaki et al. (1994). The non-linear deformations of a joint in the normal direction and in the shear direction are dependent on the confining pressure presented by Bandis et al. (1981) and Kulhawy (1975), respectively. The results indicate that the tailing dam is sound and that the water-gathering basin with a gravity-type wall should be collapsed. They also show that the additional small gravity dam is sound when the countermeasures considered are taken, and that acceleration at the gravity-type wall is reduced by one-third compared with the structure with no countermeasures taken.