Passive velocity tomography for mudstone under uniaxial compression using acoustic emission

Anye Cao; Changbin Wang; Guangcheng Jing; Wu Cai; Guangan Zhu; Jing Li

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자료유형: 학술저널

저자정보: Anye Cao (China University of Mining & Technology) Changbin Wang (China University of Mining & Technology) Guangcheng Jing (China University of Mining & Technology) Wu Cai (China University of Mining & Technology) Guangan Zhu (China University of Mining & Technology) Jing Li (China University of Mining & Technology)

저널정보: 한국지질과학협의회 Geosciences Journal Geosciences Journal Vol.21 No.1

발행연도: 2017.1

수록면: 93 - 109 (17page)

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연구주제

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A passive velocity tomography method using acoustic emission (AE) was used to study characteristics of AE responses and velocity redistributions in mudstone during uniaxial deformation. Two standard cylindrical samples were uniaxially deformed until failure with axial loading rates of 1.00 × 10–3 mm/s and 2.50 × 10–3 mm/s, respectively. AE activities were monitored using eight sensors and every 100 consecutive AE events were used for tomography calculations. For each sample, three typical tomography results were obtained which reflected significant variation of velocity redistributions. From the experimental data, it can be concluded that the stress drop point observed in the stress-strain curves with high energies and AE events indicated coalescence of micro-cracks and formation of the main shear plane. In the initial tomography phase, the velocity difference was low and few AE events were detected. As loading increased, AE events clustered and velocity differences became obvious with high velocities being mainly located near the sample boundary, whereas low velocities begun to propagate from the bottom corner to the core. When approaching failure, velocity anomaly regions further expanded and low velocity regions interconnected with the position being consistent with macro-fractures in the post-failure samples. The positions of the AE events with large energies over 50 μV·s were found to correlate well with high velocity regions in the tomography results whose calculation phase was conducted prior to the occurrence of large energy AE events. This method can be used for the prediction of large energy AE events in rocks under unconfined pressures.

참고문헌 (25)

참고문헌 신청

Cao, A. Y. / 2015 / Case study of seismic hazard assessment in underground coal mining using passive tomography / International Journal of Rock Mechanics and Mining Sciences 78:1~9

Cai, W. / 2014 / Application of seismic velocity tomography in underground coal mines: A case study of Yima mining area Henan China / Journal of Applied Geophysics 109:140~149

Chai, J. F. / 2016 / Rock failure mechanism under uniaxial compression condition based on P-T diagram of moment tensors / Journal of China University of Mining and technology 45:500~505

Chen, Y. Q. / 2011 / Crack growth in Westerly granite during a cyclic loading test / Engineering Geology 117:189~197

Chirste, P. / 2011 / An X-ray computed tomography-based index to characterize the quality of cataclastic carbonate rock samples / Engineering Geology 117:180~188

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