Crack Growth Mechanisms from 3-D Surface Flaw with Varied Dipping Angle under Uniaxial Compression


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A number of instability problems in rock engineering projects are caused by crack propagation. However, crack growth mechanisms from 3-dimentional flaw are not fully understood, in particular for 3-D flaw case with varied dipping angle. This study focuses on 3-D surface flaw using real rock specimens containing a flaw with varied inclination angle α from axial loading and dipping angle γ from specimen surface under uniaxial compression. Acoustic emission technique was used for tracing the initiation and growth of micro-cracks inside of specimen. It was found that crack growth process is affected by the dipping angle γ of the 3-D flaw. When dipping angle γ ≠ 90º, the thickness of rock above the flaw plane is thinner than that of below the flaw plane. As a result, compressive crack and wing crack initiated easily from the thinner flaw tips. And, the normalized stress for crack initiation σi /σc, AE events and the AE energy for crack growth decreases with the dipping angle γ. However, for γ = 90º, the thickness of rock above and below of the flaw tips is the same, it was observed that anti-wing crack (crack growth direction opposite to wing crack) initiated first at a certain place away from the flaw tips, then wing crack and compressive crack emerged at the late stage. For this case, the stress σi /σc, AE events and the AE energy for crack initiation and propagation are at a high value. Thus, for rock mass contains flaws geometry with small dipping angle, some problems of crack propagation may be induced easily during excavation.



Key Engineering Materials (Volumes 353-358)

Edited by:

Yu Zhou, Shan-Tung Tu and Xishan Xie




Y.S.H. Guo et al., "Crack Growth Mechanisms from 3-D Surface Flaw with Varied Dipping Angle under Uniaxial Compression", Key Engineering Materials, Vols. 353-358, pp. 2353-2356, 2007

Online since:

September 2007




[1] H. Horri & S. Nemat-Nasser. Journal of Geophysical Research, 90(B4) (1985), pp.3105-3125.

[2] C.K. Teng, X.C. Yi, S.Y. Li and D.E. Cai, Chinese J. of Geophysics. Vol. 30 (4) (1987), pp.371-378.

[3] R. H. C. Wong, M. L. Huang, M.R. Jiao and C.A. Tang, Chinese J. of Rock Mech. & Eng. Vol. 22 (2003), pp.2145-2148.

[4] R.H.C. Wong, C.M. Law, K.T. Chau and W.S. Zhu. Int. J. of Rock Mech. & Min. Sci. 41(3), (2004), pp.360-366.

[5] R.H. C Wong, Y.S.H. Guo, L.Y. Li, K.T. Chau, W.S. Zhu and S.C. Li, 6th European Conference of Fracture Failure Analysis of Nano and Engineering Materials and Structrures, Greece, July, (2006), Paper N. 264.

[6] R.H.C. Wong, Y.S.H. Guo, K.T. Chau, W.S. Zhu, and S.C. Li, Asian Pacific Conference on Fracture and strength, Sanya, Hainan Lsland, China, November 22-25, (2006).

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