Seismic Analyses for Menta Embankment Dam: Nonlinear Dynamic Analyses with HS-Small (Hardening Small Strain) Model

Abstract

Dynamic behaviour of a rockfill dam with bituminous facing is assessed through non-linear time domain FEM (Finite Element Method) analyses. Plaxis HS-small model is used for the rockfill materials. Sensitivities analysis of two different time acceleration histories, bituminous facing stiffness with different temperature and with or without upstream reservoir is undertaken. The dynamic response is generally in line with the expectation. The post-earthquake settlement is estimated 0.21 m, so the dam is unlikely to be overtopped. There could be cracks in the middle part of the bituminous facing. The cracks are more likely to occur when the temperature is 1 °C than 28 °C. Even though a non-linear analysis of this type is more time costly, today’s computer hardware makes it possible for the engineer to perform a full nonlinear dynamic analysis within reasonable time.