Rallu Antoine

Ecole Nationale des Travaux Publics de l'Etat | ENTPE · Civil Engineering

Boring shallow tunnels in urban areas generates ground-borne vibrations with energy distributed over a wide range of frequencies, up 100 Hz during excavation. As a multiple vibration source, the TBM emits waves until existing building foundations and the free surface. They do not depend only on the source and its surrounding environment but also on...

In this paper, a methodology is proposed in order to extract a relevant representation of a response spectrum considering numerous acquisitions from dynamic sensors located in different places and sollicitated under different sollicitations. This methodology, which is an extension of the Frequency Domain Decomposition method, is based on the interc...

Excavation with tunnel boring machine (TBM) can generate vibrations, causing damages to neighbouring buildings and disturbing the residents or the equipment. This problem is particularly challenging in urban areas, where TBMs are increasingly large in diameter and shallow in depth. In response to this problem, four experimental campaigns were carri...

In order to evaluate the potential impact of the shallow tunnel excavation by a tunnel boring machine (TBM) in urban areas, the authors present original in-situ measurements of vibrations inside the TBM and simultaneously on the surface. Four experimental campaigns were carried out on French tunnelling or micro-tunnelling projects, whose geotechnic...

Dynamics at low frequencies of periodic heterogeneous media is conventionally described by the method of homogenization of periodic media, when it exists a scale separation between displacements and the characteristic size of a cell irreducible from the media. At higher frequency, this separation of scales is lost and the homogenization method beco...

Dynamics at low frequencies of periodic heterogeneous media is conventionally described by the method of homogenization of periodic media, when it exists a scale separation between displacements and the characteristic size of a cell irreducible from the media. At higher frequency, this separation of scales is lost and the homogenization method beco...

As part of the tunnel monitoring of construction sites excavated by conventional methods, a monitoring system is deployed on site to measure the response of the surroundings to the impact generated by a blast. The impact of a blast on a structure can only be evaluated after different signal processing phases of the vibratory signals measured, leadi...

This paper falls within the study of dispersion feature of elastic periodic media. In most cases, no analytic description is reachable and the problem is solved via numerical computations of the dispersion curves.We propose in this paper an analytic method dedicated to lattice systems that enables to reconstruct part by part the dispersion curves v...

This paper falls within the study of dispersion feature of elastic periodic media. In most cases, no analytic description is reachable and the problem is solved via numerical computations of the dispersion curves.%, which carry all the dynamic properties of the system. We propose in this paper an analytic method dedicated to lattice systems that e...

This paper falls within the study of dispersion feature of elastic periodic media. In most cases, no analytic description is reachable and the problem is solved via numerical computations of the dispersion curves.%, which carry all the dynamic properties of the system. We propose in this paper an analytic method dedicated to lattice systems that e...

This paper addresses the modeling of large scale modulations of high-frequency mechanical waves propagating in discrete and continuum periodic reticulated structures. By means of an asymptotic approach implemented using a multi-cells approach, we derive (i) the equations governing the large scale modulations, (ii) the specific features of the modul...

L'estimation de l'impact des vibrations générées lors du creusement d'un ouvrage souterrain à l'explosif sur les structures environnantes (bâtis, autre ouvrage souterrain, etc.) est un sujet sensible non seulement pour le maître d'ouvrage du projet, mais aussi les riverains. La connaissance du fonctionnement dynamique de ces structures est un premi...

This work investigates high frequencies phenomena of large correlation length in periodic reticulated elastic media. In elasto-dynamics, the classical framework of homogenization of periodic media is based upon the principle of scale separation expressed on the motion, which is satisfied if the vibration wavelength is large compared to the cell dim...

This paper addresses the modelling of large scale modulations of high frequency mechanical waves propagating in periodic elastic composite. By means of an asymptotic approach, we derive (i) the equations governing the large scale modulations, (ii) the specific features of the modulation propagation, and (iii) the domain of validity of the descripti...

Low frequency dynamics of heterogeneous periodic media is usually described by the homogeneisation method when there is a scale separation between the displacements and the caracteristic size of the irreducible cell of the medium. At higher frequencies this scale separation is lost and the homogeneisation method cannot be applied. In order to overc...

Low frequency dynamics of heterogeneous periodic media is usually described by the homogeneisation method when there is a scale separation between the displacements and the caracteristic size of the irreducible cell of the medium. At higher frequencies this scale separation is lost and the homogeneisation method cannot be applied. In order to overc...

Ce papier décrit, par méthode asymptotique, des phénomènes hautes fréquences à grande longueur de corréla-tion dans des milieux élastiques Ω-périodiques réticulés. En élasto-dynamique, le cadre classique de l'homogé-néisation des milieux périodiques est basé sur le principe de séparation d'échelle exprimée sur le déplacement, respecté si la longueu...

This paper deals with the description of the modulation at large scale of high frequency acoustic waves in gas saturated periodic porous media. High frequencies mean local dynamics at the pore scale and therefore absence of scale separation in the usual sense of homogenization. However, although the pressure is spatially varying in the pores (accor...

This paper dealt with the description of large modulation of high frequency acoustic fields in periodic porous media. High frequencies mean local dynamics at the pores scale, and therefore absence of scale separation in the usual sense of homogenization. However, meanwhile the pressure is fast varying in the pores (according to periodic eigenmodes)...

This paper compares the nonlinear seismic response of an 10-story reinforced concrete shear wall building located in Montreal, Canada that was designed according to four different editions of the National Building Code of Canada: 1975, 1985, 1995 and 2005. The design seismic loads and detailing requirements used for the four designs are discussed a...