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Permanent link (DOI): https://doi.org/10.7939/R37D2QN04

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Simulation of Dynamic Triggering of Acoustic Emissions using a Bonded-Particle Method Open Access

Descriptions

Other title
Subject/Keyword
Bonded-particle method
Acoustic emission
Dynamic triggering
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Lu,Hang
Supervisor and department
van der Baan, Mirko(Physics)
Examining committee member and department
Heimpel, Moritz (Physics)
Currie , Claire (Physics)
Martin, Derek (Civil and environmental engineering)
van der Baan, Mirko(Physics)
Department
Department of Physics
Specialization
Geophysics
Date accepted
2017-07-27T09:09:18Z
Graduation date
2017-11:Fall 2017
Degree
Master of Science
Degree level
Master's
Abstract
Microseismic events are commonly recorded during hydraulic fracturing experiments. In microseismic interpretations, each event is often regarded as causally independent and uncorrelated to neighbouring ones. In reality, both the rock deformation (static stresses) and transient wave motion (dynamic stresses) associated with microseismic events influence the stress field together with the external loading (fluid injection). It is thus very likely that many microseismic events are caused by both static and dynamic stress changes. In other words, some events may be caused by propagation of transient waves instead of the stress changes purely related to fluid injection. In this thesis, dynamic triggering of acoustic emissions is studied as an analogy of microseismic events using Bonded Particle Method (BPM). A biaxial deformation test on a rock core sample is simulated. First, a major event is created and how dynamic waves influence the occurrence of the subsequent ones is qualitatively and quantitatively studied. Then an external vibration is applied to the model to investigate the influence of transient wave motion on failure in a controlled fashion. It is found that dynamic stresses can alter the stress field and hence cause a favorable change in the stress state for bond breakages. The external vibration can advance the formation of the upcoming large local failure events and delay or advance the final catastrophic failure depending on the vibrational amplitude.
Language
English
DOI
doi:10.7939/R37D2QN04
Rights
This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for the purpose of private, scholarly or scientific research. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.
Citation for previous publication
Lu, Hang, and Mirko van der Baan. "Simulation of Dynamic Triggering of Acoustic Emissions Using a Bonded-Particle Method." 50th US Rock Mechanics/Geomechanics Symposium. American Rock Mechanics Association, 2016.

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