Seismic Analysis of a Limestone Rock Slope Through Numerical Modelling: Pseudo-Static vs. Non-Linear Dynamic Approach

Abstract In the present work, a seismic analysis was performed in advance on limestone rock slope (height = 150 m) outcropping along Tagliamento River valley, Friuli Venezia Giulia Region, north-eastern Italy. The analysed is characterised by strong mass damage, thus resulting critical stability condition (unstable volume 110,000–200,000 m 3 ). adopting 2D finite difference method (FDM) and employing both pseudo-static approach non-linear dynamic approach. Model outcomes demonstrate that motion induces internal, localised ruptures within mass. Some important differences mechanical behaviour of were highlighted, depending specific modelling assumed. When approach, failure occurs for PGA values ranging between 0.056 g 0.124 g, different initial static assumed (Strength Reduction Factor SRF 1.00–1.15). According to achieved varying 0.213 g. Pre-collapse displacements calculated with (12–15 cm) are much more greater than those obtained through (0.5–3 mm). results also testify topographic amplification 1.5 times target acceleration at face 2.5 toe.