Source distribution of acoustic emissions during an in-situ direct shear test: Implications for an analog model of seismogenic faulting in an inhomogeneous rock mass

Ishida, Tsuyoshi; Kanagawa, Tadashi; Kanaori, Yuji

doi:10.1016/j.enggeo.2009.11.003

Cited by 76 publications

(23 citation statements)

References 43 publications

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“…In in situ direct shear test studies, an initially intact region of rock bounded by joints and a seam are fractured, generating an AE. Large-scale inhomogeneous rock-fracturing experiments, such as the in situ direct shear tests, may provide useful insights as analog models of seismogenic faulting [18]. The rockburst proneness index and the AE energy rise as the temperature increases.…”

Section: Introductionmentioning

confidence: 99%

The Mechanical and Fracturing of Rockburst in Tunnel and Its Acoustic Emission Characteristics

Liu

Zhan

Zhang

et al. 2018

Shock and Vibration

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The phenomenon of acoustic emission (AE) is associated with rock failure and rock fracturing. In order to investigate the influence of tectonic stress on rockburst in tunnel, a biaxial loading experiment system was used in this study. The excavation operation is undertaken at the center of samples to monitor the tunnel forming process in situ, and the different horizontal stresses can be studied by using the AE monitoring technique. The dynamical fracturing process of the tunnel model was summarized, and the timing parameters of AE signals in rockburst stages were obtained. The curves of AE energy and cumulative AE energy with time show a "step-like" rising trend before the occurrence of rockburst. The evolution of macro-and mesocracks is captured, and the mechanical conditions for a "V-shaped" rockburst pit are derived. As the horizontal stress increases, the effect of excavation unloading becomes more pronounced, and the damage caused by the rockburst intensifies. In the early stage of rockburst evolution, the fracturing type follows a model of tensile-shear mix model. A positive relationship between the ratio of shear fracturing type and the horizontal stress can be noted when the rock is about to burst, and the high intensity and the high energy released of from the rock-fracturing event have become evident. Thus, the results indicate that one should focus on monitoring both sides of the surrounding rock of the tunnel so as to extract the characteristics of the process of tunnel in tunnel. The applications of biaxial loading system and during an excavation operation provide a useful tool to simulate the rock burst in tunnel at an engineering site.

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Section: Introductionmentioning

confidence: 99%

The Mechanical and Fracturing of Rockburst in Tunnel and Its Acoustic Emission Characteristics

Liu

Zhan

Zhang

et al. 2018

Shock and Vibration

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“…As expected, large AE events were rarely encountered during excavation. However, by employing sensitive, high-frequency monitoring (15 to 40 kHz) for small AE events over a relatively small region (making use of experience accumulated through previous tests, including direct shear testing [11], small-scale in situ heater testing [12], and small-scale hydraulic fracturing testing [13]), we were able to locate several AE events in three dimensions and identify their fracture mechanism. The strike and dip angles of fracture planes and the directions of the principal stresses thus derived were consistent with the directions of dominant joint surfaces, measured initial stress conditions, and the shape of excavated openings near the location of an AE event.…”

Section: Introductionmentioning

confidence: 99%

Acoustic emission induced by progressive excavation of an underground powerhouse

Ishida

Kanagawa

Uchita

2014

International Journal of Rock Mechanics and Mining Sciences

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a b s t r a c tWe monitored acoustic emission (AE) events associated with the progressive excavation of an underground chamber for a powerhouse at a depth of 280 m below the surface in a porphyritic rock mass of the Mesozoic era. Large AE events rarely occur under such conditions; specifically, low-stress environments due to the shallow depth, careful excavation, and sufficient reinforcement. However, upon employing sensitive, high-frequency monitoring (15 to 40 kHz) in a relatively small region, some AE events were located and, by using fault-plane solutions, their fracture mechanisms were identified. Strike and dip angles of fracture planes and the directions of principal stresses, all derived from faultplane solutions, were consistent with the directions of dominant joint surfaces, the measured initial stress conditions, and the shape of nearby excavated openings. This suggests that by employing sensitive, high-frequency AE monitoring, fault-plane solutions can be effectively utilized as a tool to assess the stability of a chamber excavated at shallow depth, as well as in deep mines where fault-plane solutions have already been used in practice to assess and control rockbursts.

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“…The study of damage formation in jointed or bulk rock under stress has been a subject of widespread interest, and the results have led to a number of comprehensive texts. Acoustic emission (AE) techniques are broadly applied to rock in order to obtain information on the crack initiation and propagation in rock engineering [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Mechanical and Acoustic Emission Characteristics of Rock Samples under Different Stress Paths

Qin

Sun

Liu

et al. 2018

Shock and Vibration

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A series of tests on characteristics of acoustic emission have been performed on sandstone under uniaxial, conventional, and triaxial conditions and the unloading confining pressure path. The failure mode of rock specimen has been scanned by CT and a threedimensional reconstruction was made. The differences on characteristics of AE, mechanics, and the failure mode of sandstone during the failure process under three paths are studied. The results show that the deformation of rock specimen is bigger, and axial strain and circumferential strain have a deformation platform at peak point of stress under the unloading confining pressure path. Characteristics of AE ringing are significantly affected by the confining pressure and stress path. AE ringing counts peak value, and accumulative ringing on the breaking moment as well as cumulative release energy is higher, which indicates that the rock failure is more violent under the unloading confining pressure path. The failure mode of rock specimen was dominated by shear failure under the conventional triaxial stress path. The tension failure is the main form at a lower initial value of unloading confining pressure, and the shear failure is more prominent at a higher initial value of unloading confining pressure.

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Source distribution of acoustic emissions during an in-situ direct shear test: Implications for an analog model of seismogenic faulting in an inhomogeneous rock mass

Abstract: Source distribution of acoustic emissions during an in-situ direct shear test: Implications for an analog model of seismogenic faulting in an inhomogeneous rock mass

Cited by 76 publications

References 43 publications

The Mechanical and Fracturing of Rockburst in Tunnel and Its Acoustic Emission Characteristics

The Mechanical and Fracturing of Rockburst in Tunnel and Its Acoustic Emission Characteristics

Acoustic emission induced by progressive excavation of an underground powerhouse

Experimental Study on Mechanical and Acoustic Emission Characteristics of Rock Samples under Different Stress Paths

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