Browsing by Author "Lopez-Caballero, Fernando"

Now showing 1 - 2 of 2
  • No Thumbnail Available
    Item
    Effect of the inelastic dynamic soil-structure interaction on the seismic vulnerability assessment
    (2011) Saez, Esteban; Lopez-Caballero, Fernando; Modaressi-Farahmand-Razavi, Arezou
    This paper presents a study of the influence of inelastic dynamic soil-structure interaction (DSSI) on the seismic vulnerability assessment of buildings. The seismic vulnerability is evaluated in terms of analytical fragility curves constructed on the basis of non-linear dynamic finite elements (FE) analysis. An analytical sensibility strategy is introduced in order to define a suitable size of the motion database to be used for computing fragility curves. The fragility curves developed in this study are compared with reference curves. Concerning the effect of the inelastic DSSI, a general reduction of seismic demand when DSSI phenomena are included is found. Derived fragility curve reflects this seismic demand reduction. The importance of the ground motion database is highlighted in terms of the variability of parameters describing derived fragility curves. Comparison with reference curves are satisfactory. Findings illustrate clearly the importance and the advantages of an adequate DSSI effects evaluation. (C) 2010 Elsevier Ltd. All rights reserved.
  • Thumbnail Image
    Item
    Modeling self-compaction and static stability of a copper filtered tailings pile under unsaturated conditions
    (2024) Gallardo, Ricardo; Saez, Esteban; Lopez-Caballero, Fernando
    Filtered tailings piles have better mechanical stability than other tailings disposal alternatives because they operate in an unsaturated condition. However, very few studies have quantitatively assessed the contribution of partial saturation for both self-compaction and mechanical stability. In this article, we evaluate the mechanical stability of a filtered tailing pile, based on an analysis of self-consolidation by material deposition under unsaturated conditions, considering rates of 1 h, 1 day and 4 days. For this purpose, an experimental study was carried out which included oedometric and triaxial consolidation tests in both, saturated and unsaturated conditions. Based on these results, a constitutive soil model was calibrated using the Bishop's effective stress concept, considering the evolution of the effective saturation and including soil-water characteristic curve (SWCC) as a function of volumetric strains. The results show that the proposed modeling strategy provides a reasonable approximation of laboratory paths with a single set of parameters. Additionally, the same approach was applied to model the pile's construction process. In this case, it was observed that the potential failure surface is triggered when the soil reaches a saturation degree of about 65-70%. At and this value, the soil behavior is practically independent of deposition rates, slope inclination and pile height. However, the factor of safety (FoS) decreases for faster deposition rates compared to slower ones.