Abstract
Acoustic emission test and CT scanning are important techniques in the study of coal crack propagation. A uniaxial compression test was performed on coal samples by integrating CT and acoustic emission. The test comparison analyzes the acoustic emission load and CT images for an effective observation on the entire process, from crack propagation to the samples’ destruction. The box dimension of the coal samples’ acoustic emission series and the CT images were obtained through calculations by using the authors’ own program. The results show that the fractal dimension of both the acoustic emission energy and CT image increase rapidly, indicating coal and rock mass has entered a dangerous condition. Hence, measures should be taken to unload the pressure of the coal and rock mass. The test results provide intuitive observation data for the coal meso-damage model. The test contributes to in-depth studies of coal or rock crack propagation mechanisms and provides a theoretical basis for rock burst mechanism.
Similar content being viewed by others
References
Arasteh M M, 1997. Broadband acoustic emission observations during fracture propagation in rock-like material. Int. J. Rock Mech. M in. Sci., 34(3): 634.
Ge X R, Ren J X. 2000, The rock meso-damage propagation law of CT test. Science in China (Series E), (1): 104–111.
Holcomb D J, Costin L S, 1986. Detecting damage surface in brittle materials using acoustic emission. J. App. Mech., 53(4): 536–544.
Jiang Y D, Zhao Y X, He M C, 2007. Investigation on mechanism of coal mine bumps based on mesoscopic experiments. Chinese Journal of Rock Mechanics and Engineering, 26(5): 901–907.
Jiang Y D, Zhao Y X, Liu W G, 2009. Investigation on the mechanism of coal bumps and relating experiments. Beijing: Science Press.
Ju Y, Yang Y M, Song Z D, Xu W J, 2008. A statistical model for porous structure of rocks. Science in China (Series E), (7): 1026–1041.
Liu J H, Jiang Y D, Zhao Y X. 2008, Progress in the application of AE and CT in research of coal and rock fracture propagation. Metal Mine, 10: 13–15.
Lockner D, 1993. The role of acoustic emission in the study of rock fracture. Int. J. Rock Mech. Min. Sci., 30(7): 883–899.
Mansurov V A, 1994. Acoustic emission from failure rock behavior. Rock Mech. Rock Eng., 27(3): 173–182.
Meglis I L, Chow T M, Young R P, 1995. Progressive micro crack development in tests on Lac Du Bonnet granite AE source location and velocity measurements. Int. J. Rock Mech. Min. Sci., 32(8): 741–750.
Nakashima Y, 2000. The use of X-ray CT to measure diffusion coefficients of heavy ions in water-saturated porous media. Engineering Geology, 56: 11–17.
Ren J X. 2000. The real in time CT monitoring of the mesodamage evolution law of sandstone under triaxial compression. Journal of Coal Science & Engineering (China). 6(1): 19–26.
Wang E Y, He X Q, Liu Z T, 2004. Study on frequency spectrum characteristics of acoustic emission in coal or rock deformation and fracture. Journal of China Coal Society, 29(3): 289–292.
Zhou H M, Yang Y, Zhang Y H, 2010. Fine test on progressive fracturing process of multi-crack rock samples under uniaxial compression. Chinese Journal of Rock Mechanics and Engineering, 29(3): 465–470.
Author information
Authors and Affiliations
Corresponding author
Additional information
Supported by the National Basic Research Program of China (973 Program) (2010CB226801); the Youth Foundation Project of Hebei Education Department (2011-254); the Hebei Construction Science & Technology Research Guidance Plan (2012-2058)
Rights and permissions
About this article
Cite this article
Liu, Jh., Jiang, Yd., Zhao, Yx. et al. Uniaxial compression CT and acoustic emission test on the coal crack propagation destruction process. J Coal Sci Eng China 19, 69–74 (2013). https://doi.org/10.1007/s12404-013-0112-9
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s12404-013-0112-9