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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
    Development of connected permeability in massive crystalline rocks through hydraulic fracture propagation and shearing accompanying fluid injection
    (Wiley Online Library: John Wiley & Sons, Ltd, 2016)
    Preisig, Giona 
    ;
    Eberhardt, Erik
    ;
    Gischig, Valentin
    ;
    Roche, Vincent
    ;
    van de Baan, Mirko
    ;
    Valley, Benoît 
    ;
    Kaiser, Peter K.
    ;
    Duff, Damien
    ;
    Lowther, R.
    ;
    Gleeson, T.
    ;
    Ingebritse, E.
  • Publication
    Métadonnées seulement
    Hydraulic Fracturing Mine Back Trials-Design Rationale and Project Status
    (: Intech, 2013)
    Kaiser, Peter K.
    ;
    Valley, Benoît 
    ;
    Dusseault, Maurice B.
    ;
    Duff, Damien
    Last year, a joint Mining and Oil & Gas industry consortium was established in Canada to conduct hydraulic fracturing (HF) tests accompanied by a mine-back of fractured regions to assess HF models and microseismic monitoring data during controlled experiments. Details about the displacement field, fracture aperture and extent, and micro-seismic parameters could then be verified and used as calibration data for modeling of HF processes in igneous and dense sedimentary rocks. Various injection experiments are planned and they will include pre-fracturing rock mass characterisation using best available current techniques, dense arrays of multi-parameter wall and borehole-mounted instruments, and the treated volume will be mined through to assess fracturing effectiveness, existing fractures and new fracture interactions, and to determine if pathways can be identified for improving currently available numerical and fracture network modeling tools. In this paper we present the results of the experimental design and planning phase, outlining objectives and justifications for planned experimental layouts. Preliminary plans for a first mine-through trial at Newcrest Mining’s Cadia East mine in New South Wales, Australia are described. The hypotheses advanced in this experimental design, supported by evidence from the literature, are that activation and development of a fracture network by hydraulic stimulation is possible if the injection procedure is designed such that injection pressures and rates are maintained within an optimal window, thereby producing conditions under which effective stress management for risk mitigation in deep mining can best be achieved. The evaluation of these hypotheses is the focus of the current high level experimental plan presented in the paper. Keywords: stress management, stiffness modification, shale gas analogue, mine-back experiments, model calibration, hydraulic fracture, naturally fractured rocks
  • Publication
    Métadonnées seulement
    Smart Underground Monitoring and Integrated Technologies in Networked Deep Mining Observatories
    (2011)
    Kaiser, Peter
    ;
    Duff, Damien
    ;
    Valley, Benoît 
    Aspects of science and engineering which are focused on understanding the behaviour of natural materials (rocks) and the performance of manmade structures (excavations) in underground mines are best addressed using active mine sites for measurement and experimentation. Specifically, a series of test sites with known natural geological and structural variability for such work provides unparalleled opportunity for addressing issues associated with induced stresses and constructability difficulties. Modern communications allows the virtual networking of sites, thereby permitting easy data exchange among researchers and transferral of processed results back to industry. CEMI, in conjunction with its industry sponsors and a team of researchers at multiple universities, is building a network of such test sites within a virtual domain called a networked Deep Mine Observatory (nDMO) for the purpose of advancing science and engineering experimentation. It will address some of deep mining's most pressing problems including: induced stress issues such as fault slip as well as the need for enhanced excavation rates. Work will focus initially on improved rockmass characterization - leading to better modelling capability and failure prediction as well as behaviour monitoring and forecasting creating a greater capacity to understand the effects of system stiffness changes on fault and fracture stability. Strainburst mechanisms, and ways of mitigating their impact around shaft and tunnel boring systems, is also a focus. International participation is welcome.
  • Publication
    Métadonnées seulement