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Valley, Benoît

Nom
Valley, Benoît
Affiliation principale
Site web
Fonction
Professeur ordinaire
Email
benoit.valley@unine.ch
Identifiants
https://libra.unine.ch/handle/123456789/943
_
0000-0003-4632-0504

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  • Publication
    Métadonnées seulement
    Geophysical Time Series Data from a Stressed Environment
    (2011)
    Pun, Winnie
    ;
    Milkereit, Bernd
    ;
    Valley, Benoît 
    ;
    Qian, Wei
    As a proxy for stress in mines, passive monitoring from microseismics and active monitoring from controlled source resistivity survey may be utilized to better understand stress state changes. Repeated measurements over a continuous period of time are necessary to study any variations in the subsurface structure due to mining processes and natural events. The controlled source time-lapse surveys must be repeatable for meaningful studies such that any changes in the data are related to the earth?s response. This paper presents in-mine geophysical data from passive microseismics and active borehole-to-borehole resistivity surveys which show promising characteristics for stress monitoring.
  • Publication
    Métadonnées seulement
    Characterising rock mass changes using multiple geophysical monitoring techniques
    (2010)
    Valley, Benoît 
    ;
    Pun, Winnie
    ;
    Milkereit, Bernd
    ;
    Thibodeau, Denis
    A key challenge for underground rock mechanics laboratories is to identify and develop the proper techniques to characterize rock mass changes and to monitor the processes under study. The International Fault Slip Control Research Initiative (IFSCRI), being led by the Centre for Excellence in Mining Innovation (CEMI), aimed at conducting underground experiments to improve our understanding of what controls induced and triggered seismicity. A preliminary project is dedicated to the development and testing of monitoring techniques that could potentially capture stress and strain field changes as well as characterize rock mass degradation processes (fracturing). A prerequisite to monitor rock mass change is to have techniques and methodologies available that present a high repeatability index when nothing changes. In this project, the rock mass changes of a 150m x 100m x 30m volume in a crown pillar will be monitored while it is being mined out. The stress, strain and rock mass changes induced will be captured by a dense borehole array, heavily equipped with various geophysical tools. The contemplated techniques include deformation measurement using multi-point borehole extensometers, micro-seismicity monitoring, noise and seismic tremor analyses, seismic tomography, borehole logging (televiewers, sonic logs and other physical properties logging), cross-hole DC/IP, an accelerometer network and strain measurement using optical fibers. This communication presents the experimental design process involving the anticipation of the rock mass response during mining. Initial data collection targets testing of the applicability of the proposed techniques and the evaluation of their repeatability index.