Acoustic emission characteristics under the influence of different stages of damage in granite specimens
Jong-Won Lee,Tae-Min Oh,Hyunwoo Kim,Min-Jun Kim,Ki-Il Song
Abstract
The acoustic emission (AE) technique is utilized to estimate the rock failure status in underground spaces. Understanding the AE characteristics under loading conditions is essential to ensure the reliability of AE monitoring. The AE characteristics depend on the material properties (p-wave velocity, density, UCS, and Young's modulus) and damage stages (stress ratio) of the target rock mass. In this study, two groups of granite specimens (based on the p-wave velocity regime) were prepared to explore the effect of material properties on AE characteristics. Uniaxial compressive loading tests with an AE measurement system were performed to investigate the effect of the rock properties using AE indices (count index, energy index, and amplitude index). The test results were analyzed according to three damage stages classified by the stress ratio of the specimens. Count index was determined to be the most suitable AE index for evaluating rock mass stability.
Key Words
acoustic emission; AE index; damage stages; rock properties
Address
Jong-Won Lee — Research Institute of Industrial Technology, Pusan National University, 2 Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan 46241, Republic of Korea
Tae-Min Oh — Department of Civil and Environmental Engineering, Pusan National University, 2 Busandaehak-ro 63beon-gil,Geumjeong-gu, Busan 46241, Republic of Korea
Hyunwoo Kim — Mineral Exploration and Mining Research Center, Korea Institute of Geoscience and Mineral Resources (KIGAM), 124 Gwahang-no, Yuseong-gu, Daejeon 34132, Republic of Korea
Min-Jun Kim — Deep Subsurface Storage & Disposal Research Center, Korea Institute of Geoscience and Mineral Resources (KIGAM), 124 Gwahang-no, Yuseong-gu, Daejeon 34132, Republic of Korea
Ki-Il Song — Department of Civil Engineering, Inha University, 100 Inha-ro, Michuhol-gu, Incheon 22212,Republic of Korea
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