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Keywords: acoustic emission
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Proceedings Papers

Paper presented at the 58th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2024
Paper Number: ARMA-2024-0071
... of granite to better understand the fracturing process of brittle rocks under indirect tensile loading. In the experimental part, two independent monitoring techniques, Acoustic Emission (AE) and high-speed imaging, were deployed to investigate micro and macro cracking processes. The sample's behaviour...
Proceedings Papers

Paper presented at the 58th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2024
Paper Number: ARMA-2024-0905
... ABSTRACT: We simulated the tensile fracturing process, capturing both microseismic events (acoustic emissions) and the dynamics of fracture propagation through high-speed photography. To record the millisecond-level fracture propagation, a synchronization circuit was employed, designed...
Proceedings Papers

Paper presented at the 58th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2024
Paper Number: ARMA-2024-0173
... ABSTRACT: This paper studied the acoustic emission (AE) characteristics to show that there is a connection between AE dominant frequency information and crack propagation patterns in identifying synthetic rock specimens during loading, like when new cracks start to form or when existing cracks...
Proceedings Papers

Paper presented at the 58th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2024
Paper Number: ARMA-2024-0279
... ABSTRACT: Traditional laboratory acoustic emission (AE) source location analysis predominantly relies on P-wave arrival times, limiting the number of locatable sources due to the requirement of four signals for solving four unknowns. This paper explores the feasibility of incorporating S-wave...
Proceedings Papers

Paper presented at the 58th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2024
Paper Number: ARMA-2024-0287
... ABSTRACT: Laboratory experimental rock mechanics studies with acoustic emission (AE) recordings are often viewed as analogous to investigations of field-scale phenomena. The application of U-Net for processing field-scale seismic waveform has achieved widely recognized success...
Proceedings Papers

Paper presented at the 58th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2024
Paper Number: ARMA-2024-0288
... ABSTRACT: U-Net is used by seismologists for picking phases of seismic waveforms. Applying U-net to process laboratory acoustic emission (AE) signals is useful for lab-scale experiments. In this paper, we document experiments on training two different U-Nets with a dataset containing 6532...
Proceedings Papers

Paper presented at the 58th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2024
Paper Number: ARMA-2024-0467
... is intended. This under-stress experiment uses a large granite specimen of 30x30x45cm that was placed in a polyaxial frame to fracture and monitor fluid flow. To do this a fracture was created through hydraulic fracturing. Different multiphysics such as acoustic emission sensing and fiber optic cable, were...
Proceedings Papers

Paper presented at the 57th U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2023
Paper Number: ARMA-2023-0147
... ABSTRACT Detecting the damaged precursor of deep tunnel excavations using crack classification is essential for ensuring structural safety and durability since the cracking mode of a crack (tensile or shear) is connected to a rockburst. Acoustic emission (AE) is related to the mechanisms...
Proceedings Papers

Paper presented at the 56th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2022
Paper Number: ARMA-2022-0529
... ABSTRACT: In-situ stresses and their spatial distribution are important parameters in analyzing and designing underground structures. Deformation rate analysis (DRA) and acoustic emission (AE) are methods of in-situ stress measurement from oriented core, which take advantage of the stress...
Proceedings Papers

Paper presented at the 56th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2022
Paper Number: ARMA-2022-0621
... measurements and observations to understand these important processes, we study laboratory acoustic emissions in combination with numerical models to shed light on the physics governing seismicity. A dry sample of Berea sandstone was tested to failure under a confining pressure of 40 MPa in a triaxial machine...
Proceedings Papers

Paper presented at the 56th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2022
Paper Number: ARMA-2022-0545
... propagation plug fracture initiation injection acoustic emission experiment fracture propagate strength sandstone magnitude breakdown pressure ARMA 22 0545 Reducing Breakdown Pressure in Hydraulic Fracturing: A Novel Cyclic Injection Procedure Gang Han Aramco Americas, Houston, TX, USA Munir...
Proceedings Papers

Paper presented at the 56th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2022
Paper Number: ARMA-2022-0570
... ABSTRACT: Thermally induced stress changes in rock lead to creation and reactivation of microcracks with accompanying acoustic emissions (AEs). Therefore, monitoring AEs during cooling (or heating) of rock potentially allows us to determine the rock’s original stress state. This approach would...
Proceedings Papers

Paper presented at the 56th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2022
Paper Number: ARMA-2022-0767
... characterization correlation frontier fracture characterization notch variance fracture hydraulic fracturing dic variance journal triggering-triggered vector hampton xiong lockner geophysical research acoustic emission investigation rock fracture process international journal ARMA 22 767...
Proceedings Papers

Paper presented at the 56th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2022
Paper Number: ARMA-2022-0013
... metals & mining cement technology suorineni determination cube diameter accuracy effect experiment strategy attenuation acoustic emission calculation ARMA 22 13 Strategy towards accurate location of seismic events sources in mining environments: Effect of voids and backfill...
Proceedings Papers

Paper presented at the 56th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2022
Paper Number: ARMA-2022-0009
... the fracture development in glutenite, three-point bending tests were conducted on two glutenites and one sandstone. During the tests, digital image correlation (DIC) and acoustic emission (AE) were used to monitor the fracture development. It was found that compared with the load-displacement curve, the load...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1739
.... Not only did the test setup allow one to monitor Acoustic Emissions (AE), it also allowed one to visually observe i) the behavior of the fracturing and fluid patterns for each test, and ii) the fluid to diffuse into the rock matrix, while pre-fabricated flaws were gradually pressurized until cracks...

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