Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/127311
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Type: Journal article
Title: Evaluation of the propensity of strain burst in brittle granite based on post-peak energy analysis
Author: Akdag, S.
Karakus, M.
Nguyen, G.
Taheri, A.
Bruning, T.
Citation: Underground Space, 2019; OnlinePubl
Publisher: Elsevier on behalf of Tongji University Press
Issue Date: 2019
ISSN: 0362-0565
Statement of
Responsibility: 
Selahattin Akdag, Murat Karakus, Giang D. Nguyen, Abbas Taheri, Thomas Bruning
Abstract: The increasing demand for resources and depletion of near ground mineral resources caused deeper mining operations under highstress rock mass conditions. As a result of this, strain burst, which is the sudden release of stored strain energy in the surrounding rock mass, has become more prevalent and created a considerable threat to workers and construction equipment. It is, therefore, imperative to understand how strain burst mechanism and stored excess strain energy are affected due to the high confinement in deep underground conditions. For this purpose, post-peak energy distributions for brittle rocks were investigated using a newly developed energy calculation method associated with acoustic emission (AE). A series of quasi-static uniaxial and triaxial compression tests controlled by the circumferential expansion was conducted. Snap-back behaviour known as Class-II behaviour associated with energy evolution and the material response under self-sustaining failure were analysed on granites under a wide range of confining pressures (0–60 MPa). The experimental results underline that the energy evolution characteristics are strongly linked to confinement. Stored elastic strain energy (dUE), energy consumed by dominating cohesion weakening (dUCW) and energy dissipated during mobilisation of frictional failure (dUFM) showed a rising trend as increasing the confining pressure. An intrinsic ejection velocity was proposed to express the propensity of strain burst that was purely determined by the excess strain energy released from Class II rock.
Keywords: Strain burst; energy balance; Class II failure mode; self-sustaining failure; triaxial compression test; circumferential strain control
Rights: © 2019 Tongji University and Tongji University Press. Production and hosting by Elsevier B.V. on behalf of Owner. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
RMID: 1000025205
DOI: 10.1016/j.undsp.2019.08.002
Grant ID: http://purl.org/au-research/grants/arc/LP150100539
Appears in Collections:Civil and Environmental Engineering publications

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