Micromechanics and Rock Failure Process Analysis


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A major challenge in rock mechanics has been the realistic modeling that can reveal the progressive accumulation of damage and shear localization in a brittle rock under compression. The Rock Failure Process Analysis code (RFPA2D) is an efficient tool and realistic model to simulate such complexities. A key assumption of the code is that the heterogeneity of elastic moduli and failure strength are characterized by the Weibull distribution with two parameters (m and σ0 ). However, these two parameters do automatically not relate to the microstructural parameters, such as grain size and microcrack statistics. Therefore, the purpose of this paper is to elucidate the micromechanical basis of these Weibull parameters, specifically how they depend on microstructural attributes such as grain size and crack statistics. Secondly, a methodology was developed to quantitatively determine the relevant micromechanical parameters for input into the RFPA2D code. Finally, the methodology was implemented by quantifying the microcrack geometry and statistics of real rock and simulating its uniaxial compression and progressive failure behavior. The simulated result agrees well with the experimental study.



Key Engineering Materials (Volumes 261-263)

Edited by:

Kikuo Kishimoto, Masanori Kikuchi, Tetsuo Shoji and Masumi Saka




T.F. Wong et al., "Micromechanics and Rock Failure Process Analysis", Key Engineering Materials, Vols. 261-263, pp. 39-44, 2004

Online since:

April 2004




[1] M. S. Paterson, Experimental Rock Deformation - The Brittle Field, Spinger-Verlag, New York (1978) p.254.

[2] J.C. Jaeger, and N.G.W. Cook, Fundamentals of Rock Mechanics, 3rd ed., Chapman and Hall, London, UK (1979) p.593.

[3] E. Hoek, and E.T. Brown, Underground Excavation Engineering, Institute of Mining and Metallurgy, London (1980).

[4] J. Handin, J. Geophys. Res., 74 (1969) p.5343.

[5] C.A. Tang, Y.F. Fu, W.T. Yang, and X.H. Xu, Engineering Geology, 49 (1998) p.207.

[6] W. Weibull, J. Appl. Mech., 18 (1951) p.293.

[7] F.A. McClintock, and A.S. Argon, Mechanical Behavior of Materials, Addison-Wesley, Reading, MA. (1966) p.504.

[8] A.G. Evans, and T.G. Langdon, Prog. Mat. Sci., 21(1976) p.174.

[9] C.A. Tang, H. Liu, and P.K.K. Lee, Int J Rock Mech Min Sci., 37 (2000) p.555.

[10] V. Gupta, and J. Bergström, J Geophys Res, 103 (B10)(1998) p.23975.

[11] R.H.C. Wong, K.T. Chau, and R. Wang, Int. J. Rock Mech. Min. Sci., 33 (1996) p.479.

[12] H.P. Xie, and F. Gao, Int. J. Rock Mech. Min. Sci., 37(2000) p.37477.