Luca Lenti

Centre d'Études et d'Expertise sur les Risques, l'Environnement, la Mobilité et l'Aménagement

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

Salvatore Martino

Sapienza University of Rome

Jean-François Semblat

Institut des Sciences de la Mécanique et Applications Industrielles

Antonella Paciello

National Agency for New Technologies, Energy and Sustainable Economic Development

Maria Paola Santisi d’Avila

Polytech Lille

Francesca Bozzano

Sapienza University of Rome

Roberto Iannucci

Sapienza University of Rome

J. Delgado

University of Alicante

Alberto Prestininzi

Sapienza University of Rome

Gabriele Scarascia Mugnozza

Sapienza University of Rome

Stefano Rivellino

Sapienza University of Rome

Cooperative Institutions

Sapienza University of Rome

Université Gustave Eiffel

Centre National de la Recherche Scientifique

Institute of Seismology

Terra

Institute for Economic Research on Firms and Growth

University of Alicante

University of Urbino

Universidad de Granada

Paris-Est Sup

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

Results of a multidisciplinary study in the Marmara Supersite, on-shore area: Büyükçekmece landslide

EGU General Assembly Conference Abstracts (2016)

Stella Coccia Pascal Bigarré Semih Ergintav Oğuz Özel Eşref Yalçınkaya

Source

Cite

Citations (0)

Effect of Active Plastic Fine Fraction on Undrained Behavior of Binary Granular Mixtures

International Journal of Geomechanics (2021)

Stefania Gobbi Maria Paola Santisi d’Avila Luca Lenti Jean-François Semblat Philippe Reiffsteck

The mechanical behavior of binary granular mixtures strongly depends on their initial packing density, stress level, fine content, particle size distribution, mineralogy, and shape. This research aims to investigate the effect on the mechanical behavior of fine-sand mixtures of fine particle fraction through various features: grain size distribution, fine particle size, and plasticity. The concept of equivalent intergranular void ratio is proposed for this analysis. It is correlated to the micromechanical activation of fines within the sand matrix. Monotonic consolidated undrained triaxial tests are carried out for mixtures of coarse particles (sand) and fine particles (silt or clay), in the sand dominant behavior, having various shapes and grain-size distributions. Loose, medium, and dense mixtures are tested using different fine contents and confining pressures. The undrained response is strongly affected by particle interactions, depending on the packing density, particle size, and plasticity. The active fine fraction captures the active contribution of fine particles in the sand skeleton structure. It influences the equivalent intergranular void ratio estimated in these experiments and associated to the steady state of mixtures. The reliability of equivalent state theory and an original formula proposed to estimate the active fine fraction is demonstrated in the case of fine-sand mixtures having plastic fine particles and confirmed for non-plastic fines.

Void ratio

Silt

Particle (ecology)

Void (composites)

10.1061/(asce)gm.1943-5622.0002242

Cite

Citations (13)

Nonlinear Numerical Simulation of the Soil Seismic Response to the 2012 Mw 5.9 Emilia Earthquake Considering the Variability of the Water Table Position

Bulletin of the Seismological Society of America (2019)

Maria Paola Santisi d’Avila Luca Lenti Salvatore Martino Roberto Romeo

Research Article| February 19, 2019 Nonlinear Numerical Simulation of the Soil Seismic Response to the 2012 Mw 5.9 Emilia Earthquake Considering the Variability of the Water Table Position Maria Paola Santisi d'Avila; Maria Paola Santisi d'Avila aLaboratoire Jean Alexandre Dieudonné (LJAD), Université Côte d'Azur, 28 Avenue Valrose, 06108 Nice, France, msantisi@unice.fr Search for other works by this author on: GSW Google Scholar Luca Lenti; Luca Lenti bIFSTTAR, Université Paris Est, 14‐20 Boulevard Newton, 77447 Champs sur Marne, France, luca.lenti@ifsttar.fr Search for other works by this author on: GSW Google Scholar Salvatore Martino; Salvatore Martino cDipartimento di Scienze della Terra e Centro di Ricerca per i Rischi geologici (CERI), Università Roma "Sapienza", Piazzale Aldo Moro, 5, 00185 Rome, Italy, salvatore.martino@uniroma1.it Search for other works by this author on: GSW Google Scholar Roberto Walter Romeo Roberto Walter Romeo dLibera Università di Urbino Carlo Bo, Via Aurelio Saffi, 2, 61029 Urbino, Italy, roberto.romeo@uniurb.iteDeceased (2017). Search for other works by this author on: GSW Google Scholar Author and Article Information Maria Paola Santisi d'Avila aLaboratoire Jean Alexandre Dieudonné (LJAD), Université Côte d'Azur, 28 Avenue Valrose, 06108 Nice, France, msantisi@unice.fr Luca Lenti bIFSTTAR, Université Paris Est, 14‐20 Boulevard Newton, 77447 Champs sur Marne, France, luca.lenti@ifsttar.fr Salvatore Martino cDipartimento di Scienze della Terra e Centro di Ricerca per i Rischi geologici (CERI), Università Roma "Sapienza", Piazzale Aldo Moro, 5, 00185 Rome, Italy, salvatore.martino@uniroma1.it Roberto Walter Romeo dLibera Università di Urbino Carlo Bo, Via Aurelio Saffi, 2, 61029 Urbino, Italy, roberto.romeo@uniurb.iteDeceased (2017). Publisher: Seismological Society of America First Online: 19 Feb 2019 Online Issn: 1943-3573 Print Issn: 0037-1106 © Seismological Society of America Bulletin of the Seismological Society of America (2019) 109 (2): 505–524. https://doi.org/10.1785/0120170345 Article history First Online: 19 Feb 2019 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Maria Paola Santisi d'Avila, Luca Lenti, Salvatore Martino, Roberto Walter Romeo; Nonlinear Numerical Simulation of the Soil Seismic Response to the 2012 Mw 5.9 Emilia Earthquake Considering the Variability of the Water Table Position. Bulletin of the Seismological Society of America 2019;; 109 (2): 505–524. doi: https://doi.org/10.1785/0120170345 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyBulletin of the Seismological Society of America Search Advanced Search Abstract This research is focused on the case study of San Carlo village (Emilia‐Romagna, Italy), struck by the 20 May 2012 Mw 5.9 Emilia earthquake that caused severe damage because of widely observed soil liquefaction. In particular, it investigates the influence on nonlinearity effects of the variability of the water table depth caused by seasonal fluctuation. The one‐directional propagation of a three‐component seismic wave (1D‐3C approach), in a multilayered soil profile, is simulated using a finite‐element model and an elastoplastic constitutive behavior with hardening for the soil (Iwan's model). The nonlinearity is described by the normalized shear modulus decay curve obtained by resonant column (RC) tests. The shear modulus is corrected during the process (Iai's model) to consider the cyclic mobility and dilatancy of sands, depending on the actual average effective stress and the friction and dilatancy angles obtained from cyclic consolidated undrained triaxial (CTX) tests. Profiles with depth of maximum excess pore water pressure, horizontal motion, and shear strain and stress are obtained in the case of effective stress analysis (ESA), for an average position of the water table depth and for a variation of ±1 m⁠, and then compared with a total stress analysis (TSA). The variability with the water table depth of soil profile response to seismic loading is observed also in terms of hysteresis loops, time histories of the ground motion, and excess pore water pressure in the liquefiable soil layers prone to the cyclic mobility process. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.

Boulevard

10.1785/0120170345

Cite

Citations (4)

Composite mechanism of the Büyükçekmece (Turkey) landslide as conditioning factor for earthquake-induced mobility

Geomorphology (2018)

Salvatore Martino Luca Lenti Céline Bourdeau

Outcrop

10.1016/j.geomorph.2018.01.028

Cite

Citations (12)

Seismic response of landslides to natural and man-induced ground vibrations: Evidence from the Petacciato coastal slope (central Italy)

Engineering Geology (2022)

Matteo Fiorucci Salvatore Martino Marta Della Seta Luca Lenti A. Mancini

Ground vibrations

10.1016/j.enggeo.2022.106826

Cite

Citations (9)

Extended Iwan-Iai (3DXii) constitutive model for 1-directional 3-component seismic waves in liquefiable soils: applicationto the Kushiro site (Japan)

Geophysical Journal International (2018)

Maria Paola Santisi d’Avila Viet Anh Pham Luca Lenti Jean-François Semblat

The influence of pore water pressure has to be taken into account when the propagation of seismic waves in saturated soils is simulated, because it controls the strength decrease during the dynamic process and can induce phenomena such as cyclic mobility and liquefaction. The decrease of effective stresses leads to permanent deformation in the soil and damages to the surface structures. This research aims at validating a 1-directional propagation model of 3-component seismic waves (1D-3C) in a horizontally layered soil, in the case of saturated soil. A 3-D non-linear elasto-plastic model for soils is used and the variation of the shear modulus reduction curve with the pore water pressure is taken into account during the seismic event. In the case of multiaxial stress states induced by a 3C seismic motion, if no additional information is available, the modulus reduction curves in shear and compression, normalized with respect to the elastic moduli, are assumed identical, since the Poisson's ratio is supposed to be constant during the process. The multiaxial stress state in saturated soils induced by a 3C seismic motion is analysed for various stress paths. The 1D-3C wave propagation model is used to compute the seismic response of the Kushiro soil profile (Japan). The stratigraphy and geotechnical properties are deduced from in situ and laboratory tests provided by the PRENOLIN benchmark. Numerical results are in correct agreement with the records at the surface in terms of acceleration envelope.

Shear modulus

Effective stress

Overburden pressure

10.1093/gji/ggy266

Cite

Citations (4)

Seismic‐Wave Amplification in 3D Alluvial Basins: 3D/1D Amplification Ratios from Fast Multipole BEM Simulations

Bulletin of the Seismological Society of America (2016)

Kristel Carolina Meza Fajardo Jean-François Semblat Stéphanie Chaillat Luca Lenti

In this work, we study seismic wave amplification in alluvial basins having 3D standard geometries through the Fast Multipole Boundary Element Method in the frequency domain.We investigate how much 3D amplification differs from the 1D (horizontal layering) case.Considering incident fields of plane harmonic waves, we examine the relationships between the amplification level and the most relevant physical parameters of the problem (impedance contrast, 3D aspect ratio, vertical and oblique incidence of plane waves).The FMBEM results show that the most important parameters for wave amplification are the impedance contrast and the so-called equivalent shape ratio.Using these two parameters, we derive simple rules to compute the fundamental frequency for various 3D basin shapes and the corresponding 3D/1D amplification factor for 5% damping.Effects on amplification due to 3D basin asymmetry are also studied and incorporated in the derived rules.

Harmonic

Amplification factor

10.1785/0120150159

Cite

Citations (23)