Simulation of Induced Acoustic Emission in Fractured Porous Media

dc.contributor.authorKomijani, Mohammad
dc.contributor.authorGracie, Robert
dc.contributor.authorSarvaramini, Erfan
dc.date.accessioned2019-05-10T18:29:46Z
dc.date.available2019-05-10T18:29:46Z
dc.date.issued2019-04-01
dc.descriptionThe final publication is available at Elsevier via https://doi.org/10.1016/j.engfracmech.2018.07.028 © 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.description.abstractAcoustic/microseismic Emissions (AE) in naturally fractured porous media are the result of local instability along internal interfaces and the sudden release of strain energy stored in the rock matrix. This rapid release of energy, stimulates high-frequency components of the dynamic response of the rock mass, inducing mechanical wave propagation. In this article an enriched finite element model is employed to concurrently simulate the interface instability and the induced wave propagation processes in a fractured porous media. Harmonic enrichment functions are used in the context of the Generalized Finite Element Method (GFEM) to suppress the spurious oscillations that can appear in wave propagation/dynamic modelings using regular finite elements. To model the fractures, the Phantom Node Method (PNM) is employed with the GFEM. The frictional contact condition at material interfaces is modeled using a stable augmented Lagrange multiplier approach. Through various parametric studies it’s shown that (i) decreasing the permeability leads to an increase in the frequency and a decrease in the amplitude of the acoustic signal; (ii) increasing viscous damping leads to narrower frequency spectrum and decreased magnitude of the emitted acoustic signal; (iii) increasing damping leads to a transition from transient wave propagation to diffusion-dominated AE response; (iv) increasing interface friction leads to more pronounced stick-slip behavior and higher amplitude AE-without interface friction there is no AE. Lastly, the numerical illustrations demonstrate the superior capability of the enriched model (in comparison with regular finite element models) in suppressing the spurious oscillations in AE solutions.en
dc.description.sponsorshipNatural Sciences and Engineering Research Council || Ontario Ministry of Innovation and Researchen
dc.identifier.issn0013-7944
dc.identifier.urihttps://doi.org/10.1016/j.engfracmech
dc.identifier.urihttp://hdl.handle.net/10012/14626
dc.language.isoenen
dc.publisherElsevieren
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectacoustic emissionen
dc.subjectporous mediaen
dc.subjectfractureen
dc.subjectcontact simulationen
dc.subjectgeneralized finite element methoden
dc.titleSimulation of Induced Acoustic Emission in Fractured Porous Mediaen
dc.typeArticleen
dcterms.bibliographicCitationKomijani, M., Gracie, R., Sarvaramini, E., Simulation of Induced Acoustic Emission in Fractured Porous Media, Engineering Fracture Mechanics (2018), doi: https://doi.org/10.1016/j.engfracmech. 2018.07.028en
uws.contributor.affiliation1Faculty of Engineeringen
uws.contributor.affiliation2Civil and Environmental Engineeringen
uws.peerReviewStatusRevieweden
uws.scholarLevelFacultyen
uws.scholarLevelGraduateen
uws.typeOfResourceTexten

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