Seismic analysis of soil slopes using flac2d and modified newmark approach.

Abstract

Case study on the stability of an actual soil slope, comprising an embankment with two canal bunds at the top, has been conducted for three different stages of construction. The analyses have been implemented with different foundation soils in different seismic zones. The results of the pseudo-static analyses have been plotted in the form of variation of factor of safety with horizontal seismic acceleration coefficient (kh). Dynamic analyses have been carried out by plotting the response spectrum curves and selecting the 1995 Kobe and 2001 Bhuj earthquake motions as the input ground motions. The results obtained from numerical analyses using finite difference-based software FLAC2D have been compared with a developed and modified Newmark method. The efficiency of FLAC2D to provide reliable numerical solutions for seismic slope stability analyses for practical design has been established.