Static and Dynamic Analysis of Nailed Slope

This paper presents the stability analysis for a nailed slope with 50 slope angle and 20m height under both static and seismic condition. The analysis is carried out by both 2D limit equilibrium and Finite element methods using a geotechnical modeling software GeoStudio. A parametric study is carried out to analyse the effect of nail inclination, nail spacing and nail length on the stability of nailed slope. The soil slope attained stability with factor of safety of 1.628 by the inclusion of nails into the slope. The behavior of optimum nailed slope during an earthquake of PGA 0.15g is analysed with the help of finite element analysis in QUAKE/w module of GeoStudio. The response of the nailed slope during the earthquake is analysed in terms of its factor of safety, displacements and shear stresses at nodal points which are selected in the cross section. The nailed slope is critical at 7th second of earthquake with factor of safety of 1.35 for an average acceleration 0.124m/s2. The nailed slope is also analysed to verify its stability against an earthquake record of Uttar Kashi with PGA of 0.31g lapsed for 40sec.