Acoustic Emission Parameters of Three Gorges Sandstone during Shear Failure

• Autorzy: Xu J. , Liu Y. , Peng S.

Identyfikatory

DOI

10.1515/acgeo-2016-0094

• Języki publikacji: EN

Abstrakty

EN

In this paper, an experimental investigation of sandstone samples from the Three Gorges during shear failure was conducted using acoustic emission (AE) and direct shear tests. The AE count rate, cumulative AE count, AE energy, and amplitude of the sandstone samples were determined. Then, the relationships among the AE signals and shearing behaviors of the samples were analyzed in order to detect micro-crack initiation and propagation and reflect shear failure. The results indicated that both the shear strength and displacement exhibited a logarithmic relationship with the displacement rate at peak levels of stress. In addition, the various characteristics of the AE signals were apparent in various situations. The AE signals corresponded with the shear stress under different displacement rates. As the displacement rate increased, the amount of accumulative damage to each specimen decreased, while the AE energy peaked earlier and more significantly. The cumulative AE count primarily increased during the post-peak period. Furthermore, the AE count rate and amplitude exhibited two peaks during the peak shear stress period due to crack coalescence and rock bridge breakage. These isolated cracks later formed larger fractures and eventually caused ruptures.

Słowa kluczowe

EN

sandstone; acoustic emission; displacement rate; shear failure

PL

piaskowiec; emisja akustyczna; zmęczenie wysokocyklowe

• Wydawca: Instytut Geofizyki PAN ; Springer
• Czasopismo: Acta Geophysica
• Rocznik: 2016
• Tom: Vol. 64, no. 6
• Strony: 2410--2429
• Opis fizyczny: Bibliogr. 21 poz.

Twórcy

autor

Xu J.

• State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, China
• State and Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam, Chongqing University, Chongqing, China

autor

Liu Y.

• State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, China
• State and Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam, Chongqing University, Chongqing, China

autor

Peng S.

• State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, China
• State and Local Joint Engineering Laboratory of Methane Drainage in Complex Coal Gas Seam, Chongqing University, Chongqing, China

Bibliografia

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Uwagi

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę (zadania 2017)