A5025517668- Acoustic Wave Phenomena Research
- Seismic Waves and Analysis
- Metamaterials and Metasurfaces Applications
- Fluid Dynamics Simulations and Interactions
- Dynamics and Control of Mechanical Systems
- Geophysics and Sensor Technology
- Advanced Materials and Mechanics
- Cellular and Composite Structures
- Advanced Fiber Optic Sensors
- Underwater Acoustics Research
- Geological and Geophysical Studies Worldwide
- Geotechnical Engineering and Soil Stabilization
- Geotechnical and construction materials studies
- Geotechnical Engineering and Underground Structures
- Structural Response to Dynamic Loads
- Geophysical Methods and Applications
- Grouting, Rheology, and Soil Mechanics
- Concrete and Cement Materials Research
- Structural Health Monitoring Techniques
- Nonlinear Photonic Systems
- Coastal and Marine Dynamics
- Advanced Antenna and Metasurface Technologies
- Geotechnical Engineering and Soil Mechanics
- Seismic Performance and Analysis
- Acoustic Wave Resonator Technologies
Institut Fresnel
2017-2023
Centre National de la Recherche Scientifique
2017-2023
Centrale Marseille
2017-2023
Aix-Marseille Université
2023
Association for the Development of Earthquake Prediction
2022
Menard (Poland)
2011-2018
Dynamique des Génomes et Adaptation Microbienne
2017
Institut de Recherche en Génie Civil et Mécanique
2012-2016
Materials engineered at the micro- and nanometer scales have had a tremendous lasting impact in photonics phononics. At much larger scales, natural soils civil decimeter to meter may interact with seismic waves when global properties of medium are modified, or alternatively thanks metamaterial constituted mesh vertical empty inclusions bored initial soil. Here, we show experimental results test carried out using generated by monochromatic vibrocompaction probe. Measurements particles'...
The regularity of earthquakes, their destructive power, and the nuisance ground vibration in urban environments, all motivate designs defence structures to lessen impact seismic waves on buildings. Low frequency waves, range $1$ $10$ Hz for earthquakes up a few tens vibrations generated by human activities, cause large amount damage, or inconvenience, depending geological conditions they can travel considerable distances may match resonant fundamental ultimate aim any metamaterial, other...
We investigate stop band properties of a theoretical cubic array iron spheres connected to bulk concrete via or rubber ligaments. Each sphere moves freely within surrounding air cavity, but ligaments couple it the and facilitate bending rotational motions. Associated low frequency local resonances are predicted by an asymptotic formula. find complete bands in range [16,21] Hz (resp. [6,11] Hz) for 7.4 m 0.74 m) diameter with 10 1 center-to-center spacing, when they steel rubber) The...
We show that seismic energy simulated by an artificial source mainly propagates Rayleigh surface waves, is focused in structured soil made of a grid holes distributed the ground. carry out large-scale field tests with consisting cylindrical and vertical ground low frequency (<10 Hz). This allows identification distribution inside grid, which can be interpreted as consequence dynamic anisotropy akin to effective negative refraction index. Such flat lens reminiscent what Veselago Pendry...
We propose that wave propagation through a class of mechanical metamaterials opens unprecedented avenues in seismic protection based on spectral properties auxetic-like metamaterials. The elastic parameters these like the bulk and shear moduli, mass density, even Poisson ratio, can exhibit negative values stop bands. show here waves with frequencies ranging from 1 Hz to 40 be influenced by decameter scale version buried soil, combined effects impedance mismatch, local resonances Bragg More...
Abstract Today, acoustic metamaterials form a core area of metamaterial research. They offer bespoke wave control, achievable through their rationally designed structure and are at the forefront applications commercialisation. find purpose across science defence sectors in filtering, sensing, communications, energy harvesting, thermal emission aeroacoustics, to name but few. enjoy success metropolitan environments with designer audio noise mitigation falling within remit; technologies...
We explore interactions of elastic waves propagating in plates (with soil parameters) structured with concrete pillars buried the soil. Pillars are 2 m diameter, 30 depth and plate is 50 thickness. study frequency range 5 to 10 Hz, for which Rayleigh wave wavelengths smaller than This compatible ranges particular interest earthquake engineering. It demonstrated this paper that two seismic cloaks' configurations allow an unprecedented flow elastodynamic energy associated surface waves. The...
ABSTRACT The construction of a new industrial and commercial area in 2009 at the Givors’ former glass factory France involved heavy dynamic compaction work. For purpose founding buildings, it was necessary to improve ground mechanical properties 7–15 m well‐graded gravel backfill lying on geotechnical bedrock. In order assess quality depth compaction, cone penetration tests are often performed before after compaction. method is intrusive one‐location test. It requires substantial amount time...
Abstract The discovery of photonic crystals 30 years ago in conjunction with research advances plasmonics and metamaterials, has inspired the concept decameter scale metasurfaces, coined seismic metamaterials for an enhanced control surface (Love Rayleigh) bulk (shear pressure) elastodynamic waves. These powerful mathematical tools coordinate transforms, effective medium Floquet-Bloch theories which have revolutionized nanophotonics, can be translated language civil engineering geophysics....
Diverting and controlling the impact of elastic vibrations upon an infrastructure is a major challenge for seismic hazard mitigation reduction machine noise vehicle vibration in urban environment. Seismic metamaterials (SMs), with their inherent ability to manipulate wave propagation, provide key route overcoming technological hurdles involved this challenge. Engineering structure SM serves as basis tune enhance its functionality, inspired by split rings, swiss-rolls, notch-shaped,...
Distributed acoustic sensing (DAS) technology applied to telecommunication optical fiber networks offers new possibilities for structural health monitoring. The dynamic responses of five bridges are extracted along a 24-km long crossing the Lyon metropolitan area in France. From their characteristics signals, three physical parameters informing on structures have been determined: vibration frequencies, damping and modal shapes. measurements agreement with velocimetric data serving as...
We outline some recent research advances on the control of elastic waves in thin and thick plates, that have occurred since large scale experiment [S. Brûlé, Phys. Rev. Lett. 112 , 133901 (2014)] demonstrated significant interaction surface seismic with holes structuring sedimentary soils at meter scale. further investigate wave trajectories compressional body structured buildings. A substitution by inclusions, acting as foundations, raises question effective dynamic properties these soils....
We begin with a brief historical survey of discoveries quasi-crystals and graphene, then introduce the concept transformation crystallography, which consists application geometric transforms to periodic structures. consider motifs three-fold, four-fold six-fold symmetries according crystallographic restriction theorem. Furthermore, we define five-fold symmetry such as generated by cut-and-projection method from structures in higher-dimensional space. analyze elastic wave propagation...
Materials engineered at the micro- and nano-meter scale have had a tremendous lasting impact in photonics phononics, with applications ranging from periodic structures disallowing light sound propagation stop band frequencies, to subwavelength focussing cloaking metamaterials. Here, we present description of seismic test held on soil structured meter using vibrocompaction probes. The most simplistic way interact wave is modify global properties medium, acting density then velocity. main...
Some properties of electromagnetic metamaterials have been translated, using some wave analogies, to surface seismic control in sedimentary soils structured at the meter scale. Two large scale experiments performed 2012 near French cities Grenoble [] and Lyon confirmed usefulness this methodology its potential influence on soil-structure interaction. We present here a new perspective in-situ experiment Lyon, which unveils energy corridors lens. further introduce concept time-modulated...
Les fondations profondes et les éléments verticaux constitutifs du renforcement de sol en zone urbaine peuvent être considérés comme des structures enterrées interférant avec vibrations certaines composantes signal sismique se propageant dans milieux à faible vitesse. Dans ces artificiels anisotropes constitués d'éléments géométriques pleins ou vides, phénomènes physiques provoqués sont interférences ondes diffractées sur surfaces objets. effets l'anisotropie renforcés par résonances locales...
Structured soils with regular meshes of metric size holes implemented in first ten meters the ground have been theoretically and experimentally tested under seismic disturbance this last decade. rigid inclusions embedded a substratum also recently developed. The influence these can be characterized different ways: redistribution energy within network focusing effects for metamaterials, wave reflection, frequency filtering, reduction amplitude signal energy, etc. Here we provide some...