Laboratory Acoustic Emission in Study of Rock Mechanics

Manthei, Gerd; Zang, Arno; Große, Christian U.

doi:10.1007/978-3-030-67936-1_17

Cited by 4 publications

(3 citation statements)

References 122 publications

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“…Moreover, focal mechanism analysis of selected events results primarily in strike-slip solutions (Fig. 4 ), in accordance with the observed interface creep, whereas some of the smaller events away from the interface are likely due to small pore collapse as a response to stress increase 24 . The event locations in Fig.…”

Section: Resultssupporting

confidence: 77%

“…The exposure of a rock sample to true triaxial loading is here combined with controlled fluid injection rates and pressures, as well as measurements of deformation and acoustic emissions. Acoustic emission (AE) experiments are primarily conducted to test rock strength and failure mechanisms at various scales and under different boundary conditions 20 – 24 . For example, in a pioneering study of stick–slip sliding of artificial interfaces with 2 m length induced by water injection, Lockner et al 25 measured the values of dynamic stress drop, interface slip and slip velocities, allowing to better understand the mechanics that ultimately lead to unstable failure.…”

Section: Introductionmentioning

confidence: 99%

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Cubic-meter scale laboratory fault re-activation experiments to improve the understanding of induced seismicity risks

Oye

Stanchits

Babarinde

et al. 2022

Sci Rep

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To understand fluid induced seismicity, we have designed a large-scale laboratory experiment consisting of a one-cubic-meter sandstone with an artificial fault cut and fluid-injection boreholes. The sandstone block is assembled in a true triaxial loading frame and equipped with 38 piezoelectric sensors to locate and characterise acoustic emission events. The differential stress on the artificial fault is increased in stages to bring it towards a critically stressed state. After each stage of differential stress increase, fluids are injected at low pressures through boreholes to test the potential of fault re-activation. In addition, a high-pressure injection was conducted that created a hydraulic fracture from the injection borehole towards the artificial fault. The newly generated fluid pathway resulted in an activation of the complete block through a stick–slip movement. We compare acoustic emission measurements from the laboratory experiment with seismicity observations from the field-scale CO2 injection at Decatur, Illinois, U.S., and conclude that the existence of fluid pathways plays a decisive role for the potential of induced seismicity.

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Section: Resultssupporting

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Cubic-meter scale laboratory fault re-activation experiments to improve the understanding of induced seismicity risks

Oye

Stanchits

Babarinde

et al. 2022

Sci Rep

View full text Add to dashboard Cite

show abstract

“…In addition, the acoustic emission (AE) has been studied by some researchers. AE activity of rock failure and friction were researched combined with the information of rock by Zhang et al [24], Mansurov [25],…”

Section: Introductionmentioning

confidence: 99%

Microseismic fuzzy comprehensive evaluation method of coal burst - A case study in Zhaolou Coal Mine

Zhang,

Liang,

Lin

et al. 2024

Preprint

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Based on a coal burst in LW 1305 and combined with the curve of stress vs. strain, six multi-parameters are proposed to forewarn coal burst induced by static high-stress concentration and impact loading, containing microseismic (MS) activity S value, fault total area A(t) value, lacking of shock b value, statistical Z value, MS entropy value and the dominant frequency. The precursors mainly characterize the enhancement trend of S value, the suddenly and sharply rise of A(t) value, the continuous and abnormal lower b value, the increasing absolute value of Z sharply and large than 2, the continuous and abnormal decline of Qt value, and the dominant frequency moving to low-frequency band, respectively. The coal burst in LW 1305 was induced by the intrinsic static high-stress concentration and the external strong impact loading generated by fracturing of the key stratum. Essentially, a lot of micro-fissures inside the key stratum had initiated, converged and connected to form the macro-fracture above LW 1305, which was verified by the attenuation rate of K value. Considering the time-varying effect of the overlying stratum movement, the curves of the six multi-parameters have a good agreement with that of stress vs. strain, which indicates it is reasonable to take the observed zone as a whole system to investigate variation of the multi-parameters and fracturing of the key stratum. It is noteworthy that the MS multi-parameters should be combined with reasonable mining arrangement and corresponding prevention measures to monitor, forecast and control coal bursts in the field.

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Failure characteristics and mechanism of coal under the coupling between different confining pressures and disturbance loading

Zhou,

Liu,

Wang

et al. 2023

Bull Eng Geol Environ

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Laboratory Acoustic Emission in Study of Rock Mechanics

Cited by 4 publications

References 122 publications

Cubic-meter scale laboratory fault re-activation experiments to improve the understanding of induced seismicity risks

Cubic-meter scale laboratory fault re-activation experiments to improve the understanding of induced seismicity risks

Microseismic fuzzy comprehensive evaluation method of coal burst - A case study in Zhaolou Coal Mine

Failure characteristics and mechanism of coal under the coupling between different confining pressures and disturbance loading

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