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Investigating the Damage Surface of ...

Osumanu, Ahmed,

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Investigating the Damage Surface of Rock Using Acoustic Emission /

Record Type:	Electronic resources : Monograph/item
Title/Author:	Investigating the Damage Surface of Rock Using Acoustic Emission // Ahmed Osumanu.
Author:	Osumanu, Ahmed,
Description:	1 electronic resource (70 pages)
Notes:	Source: Masters Abstracts International, Volume: 85-12.
Contained By:	Masters Abstracts International85-12.
Subject:	Geological engineering. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31301015
ISBN:	9798383163306

Investigating the Damage Surface of Rock Using Acoustic Emission /
Osumanu, Ahmed,

Investigating the Damage Surface of Rock Using Acoustic Emission /Ahmed Osumanu. - 1 electronic resource (70 pages)

Source: Masters Abstracts International, Volume: 85-12.

Subjecting rock specimens to increasing mechanical or environmental loads results in irreversible damage at a yield stress state, which may eventually lead to failure. This study used acoustic emission (AE) methods to investigate the yield stress states of Valentine limestone and Dunnville sandstone. By observing AE responses and assuming the Kaiser effect occurs when a stress state contacts the yield surface, a loci of threshold stresses forming a line in the σ1 - σ3 stress plane was developed for the sandstone.Cyclic loading on two subcore specimens of Valentine limestone was performed to study the uniaxial yield stress. In addition, axisymmetric (σ1 > σ2 = σ3) probing of the damage surface was conducted on both limestone and sandstone specimens using a Hoek-Franklin pressure cell. A modified University of Minnesota plane strain device enabled multiaxial compression tests on rectangular limestone specimens instrumented with AE sensors.Stress, strain, and AE events were recorded and cumulative AE counts versus axial stress plots were used to determine yield stress states. The AE results showed yield stress levels not detected on the stress-strain curves. While AE events during loading were few and inconsistent for the limestone, the AE activity was significant for sandstone specimens. A Mohr-Coulomb yield criterion was fitted to the yield stress data assuming a common vertex for the failure and yield surfaces. Thus, both internal friction angle and cohesion increase during hardening. In the multiaxial tests on the limestone, the Kaiser effect could not be established for the AE onset stress to be compared with the measured in-situ state of stress because of insufficient AE counts.

English

ISBN: 9798383163306Subjects--Topical Terms:

2122713
Geological engineering.
Subjects--Index Terms:

Acoustic emission

Investigating the Damage Surface of Rock Using Acoustic Emission /
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245 1 0 $a Investigating the Damage Surface of Rock Using Acoustic Emission / $c Ahmed Osumanu.
264 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2024
300 $a 1 electronic resource (70 pages)
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500 $a Source: Masters Abstracts International, Volume: 85-12.
500 $a Advisors: Labuz, Joseph F. Committee members: Guzina, Bojan; Teyssier, Christian.
502 $b M.S. $c University of Minnesota $d 2024.
520 $a Subjecting rock specimens to increasing mechanical or environmental loads results in irreversible damage at a yield stress state, which may eventually lead to failure. This study used acoustic emission (AE) methods to investigate the yield stress states of Valentine limestone and Dunnville sandstone. By observing AE responses and assuming the Kaiser effect occurs when a stress state contacts the yield surface, a loci of threshold stresses forming a line in the σ1 - σ3 stress plane was developed for the sandstone.Cyclic loading on two subcore specimens of Valentine limestone was performed to study the uniaxial yield stress. In addition, axisymmetric (σ1 > σ2 = σ3) probing of the damage surface was conducted on both limestone and sandstone specimens using a Hoek-Franklin pressure cell. A modified University of Minnesota plane strain device enabled multiaxial compression tests on rectangular limestone specimens instrumented with AE sensors.Stress, strain, and AE events were recorded and cumulative AE counts versus axial stress plots were used to determine yield stress states. The AE results showed yield stress levels not detected on the stress-strain curves. While AE events during loading were few and inconsistent for the limestone, the AE activity was significant for sandstone specimens. A Mohr-Coulomb yield criterion was fitted to the yield stress data assuming a common vertex for the failure and yield surfaces. Thus, both internal friction angle and cohesion increase during hardening. In the multiaxial tests on the limestone, the Kaiser effect could not be established for the AE onset stress to be compared with the measured in-situ state of stress because of insufficient AE counts.
546 $a English
590 $a School code: 0130
650 4 $a Geological engineering. $3 2122713
650 4 $a Mining. $3 3544442
650 4 $a Acoustics. $3 879105
653 $a Acoustic emission
653 $a Damage surface
653 $a In-situ stress
653 $a Kaiser effect
653 $a Yield stress
653 $a Sandstone specimens
690 $a 0543
690 $a 0466
690 $a 0986
690 $a 0551
710 2 $a University of Minnesota. $b Civil Engineering. $e degree granting institution. $3 3816392
720 1 $a Labuz, Joseph F. $e degree supervisor.
773 0 $t Masters Abstracts International $g 85-12.
790 $a 0130
791 $a M.S.
792 $a 2024
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31301015