The Wing Crack Growth Processes of Rock Induced by Hydraulic Pressure

Abstract:

The pre-existing fractures in rock can close, open and growth as it subjected to mechanical or environment loading, which can in turn change the structure of the rock and alter its fluid flow properties. In order to study the crack growth processes of pre-existing fracture in rock under the condition of hydraulic and mechanical coupling, a numerical tool, named F-RFPA2D which takes into account the growth of existing fractures and the formation of new fractures, is used for this purpose. By considering the effect of hydraulic pressure filling into the wing crack, the behavior of fluid flow, damage evolution and their coupling action in the pre-existing and the newly formed fractures are studied in detail. The modeling results suggest that the hydraulic pressure in the crack enhanced the tensile stresses at the crack tips, resulting in crack growth path is different from that without hydraulic pressure loading. The wing crack growth mechanism under the coupling of hydraulic and mechanical is discussed, which provides a good reference for studying on the hydraulic fracturing in rock masses.

• Periodical: Applied Mechanics and Materials (Volumes 405-408)
• Pages: 611-616
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.405-408.611
• Online since: September 2013
• Authors: Shi Bin Tang, Zheng Zhao Liang, Hong Li, Chu Nan Tang
• Keywords: Crack Growth Process, Heterogeneity, Hydraulic Pressure, Wing Crack

References

[1] A.A. Griffith: Philos. Trans. R. Soc. London Ser. A Vol. 221 (1921), pp.163-198.

[2] G.R. Irwin: J. Appl. Mech. Vol. 24 (1957), pp.361-364.

[3] E. Hoek, Z.T. Bieniawski: Int. J. Fract. Mech. Vol. 1 (1965), pp.137-155.

[4] R.H.C. Wong, K.T. Chau: Int. J. Rock Mech. Min. Sci. Vol. 35 (1998), pp.147-164.

[5] A. Bobet, H.H. Einstein: Int. J. Rock Mech. Min. Sci. Vol. 35 (1998), pp.863-889.

[6] R.L. Kranz: Tectonophysics Vol. 100 (1983), pp.449-480.

[7] H. Horii, S. Nemat-Nasser: J. Geophys. Res. Vol. 90B4 (1985), pp.3105-3125.

[8] M.F. Ashby, S.D. Hallam: Acta Metall. Vol. 34 (1986), pp.497-510.

[9] S. Nemat-Nasser, H. Horii: J. Geophys. Res. Vol. V87 (1982), pp.6805-6821.

[10] C.A. Tang, S.Q. Kou: Engng. Fract. Mech. Vol. 61 (1998), pp.311-324.

[11] Y.L. Zhao, P. Cao, W.J. Wang, W. Wan, R. Chen: J. Cent. South Univ. Vol. 19 (2012), 578-585.

[12] Y. Nakashima: Contributions to Mineralogy and Petrology Vol. 11 (1993), pp.289-295.

[13] N. Zhuang: Propagation rule of crack rock mass and its mathematics model research under the hydraulic-stress coupling (Tongji University Publications, China 2006).

[14] N. Katsumi, M. Hirokazu, N. Hiroaki, T. Noriyoshi: Geothermics Vol. 37 (2008), 157−172.

[15] C.A. Tang, L.G. Tham, P.K.K. Lee, T.H. Yang, L.C. Li: Int. J. Rock Mech. Min. Sci. Vol. 39 (2002), pp.477-489.

[16] M.F. Ashby, C.G. Sammis; Pageph Vol. 133(1990), pp.489-521.