Proceedings of the Korean Society for Rock Mechanics Conference (한국암반공학회:학술대회논문집)
- 2006.03a
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- Pages.79-93
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- 2006
Experimental observation and realistic modeling of initiation and propagation of the rock fracture by acoustic emission
- Wang, Shu-Hong (School of Civil, Urban & Geosystem Engineering, Seoul National University) ;
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Lee, Chung-In
(School of Civil, Urban & Geosystem Engineering, Seoul National University) ;
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Jeon, Seok-Won
(School of Civil, Urban & Geosystem Engineering, Seoul National University) ;
- Lee, Hee-Kwang (School of Civil, Urban & Geosystem Engineering, Seoul National University) ;
- Tang, Chun-An (Research Institute of Engineering Mechanics, Dalian University of Technology)
- Published : 2006.03.31
Abstract
It is well known that acoustic emission (AE) is indicator of rock fracturing or damage as rock is brought to failure under the uniaxial compressive loads. In this paper, an experimental study on the source location of acoustic emission on the cylindrical specimens of granite under uniaxial compression test was made. The AE source location was made by measuring the six channel AE data. Comparing to this experiment, the numerical method is applied to model the initiation and propagation of fracture by AE using a numerical code, RFPA (Realistic Failure Process Analysis). This code incorporates the mesoscopic heterogeneity in Young's modulus and rock strength characteristic of rock masses. In the numerical models, values of Young's modulus and rock strength are realized according to a Weibull distribution in which the distribution parameters represent the level of heterogeneity of the medium. The results of the simulations show that RFPA can be used not only to produce acoustic emission similar to those measurements in our experiments, but also to predict fracturing patterns under uniaxial loading condition.
Keywords
- Acoustic emission Damage;
- Microcracking;
- Rock Numerical modelling;
- Fracture process;
- Heterogeneity;
- initiation and propagation of the rock fracture