Fracture Behavior and Water Migration in Heterogeneous and Porous Rocks

Abstract:

Based on the heterogeneous and porous characteristics of rock materials, a flow-stressdamage (FSD) model, implemented with the Rock Failure Process Analysis code (RFPA2D), is used to investigate the behavior of fluid flow and damage evolution, and their coupling action in rock sample that are subjected to both hydraulic and uniaxial compressive loading. A highly heterogeneous sample, containing grains, grain boundaries and weak zones, is employed in the numerical simulation. The simulation results provide a deep insight in the physical essence of the evolutionary nature of fracture phenomena as well as the fluid flow in heterogeneous materials, especially when they are highly stressed. The simulation result suggests that the nature of fluid flow and strength character in rocks strongly depends upon the heterogeneity of the rocks.

• Periodical: Key Engineering Materials (Volumes 297-300)
• Pages: 2636-2641
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.297-300.2636
• Online since: November 2005
• Authors: Lian Chong Li, Leslie George Tham, Tian Hong Yang, Xia Li
• Keywords: Failure Process, Fluid Flow, Heterogeneous, Numerical Approach

References

[1] S.P. Li and D.X. Wu: Effect of confining pressure, pore pressure and specimen dimension on permeability of Yinzhuang sandstone, Int. J. Rock Mech. Min. Sci. Vol. 34 (1997), pp.435-441.

DOI: 10.1016/s1365-1609(97)00231-1

[2] R.Q. Wang and J.M. Kemeny: A study of the coupling between mechanical loading and flow properties in tuffaceous rock, Rock Mechanics (Edited by P.P. Nelson and S.E. Laubach) Balkema, Rotterdam (1994), pp.749-755.

[3] J. Rutqvist, L. Borgesson, M. Chijimatsu, T.S. Nguyen, J. Noorishad and C.F. Tsang: Coupled thermo-hydro-mechancal analysis of a heater test in fractured rock and bentonite at Kamaishi Mine- comparison of field results to predictions of four finite element models, Int. J. Rock Mech. Min. Sci. Vol. 38 (2001).

DOI: 10.1016/s1365-1609(00)00069-1

[4] J. Noorishad: Seepage in fractured rock: finite element analysis of rock mass behaviour under coupled action of body forces, flow forces and external loads, Ph. D Thesis (University of Berkeley, California, U.S.A. 1971).

[5] J.E. Gale: A numerical, field and laboratory study of flow in rocks with deformable fractures, PhD Thesis (University of Berkeley, California, U.S.A. 1975).

[6] C.A. Tang: Coupled analysis of flow, stress and damage (FSD) in rock failure. Int. J. Rock Mech. & Min. Sci. Vol. 39 (2002), pp.477-489.

DOI: 10.1016/s1365-1609(02)00023-0

[7] M.H. Aliabadi: Fracture of Rock (Computational Mechanics Publications, WITPRESS, Boston, Southampton 1999).

[8] E. Eberhardt, B. Stimpson and D. Stead: Effect of grain size on the initiation and propagation thresholds of stress-induced brittle fractures, Rock Mech. Rock Eng. Vol. 32 (2) (1999), pp.81-99.

DOI: 10.1007/s006030050026

[9] M. Ostoja-Starzewski: Random fields and processes in mechanics of granular materials, Mechanics of Materials Vol. 16 (1993), pp.55-64.

DOI: 10.1016/0167-6636(93)90027-o

[10] W.C. Zhu and C.A. Tang: Micromechanical Model for Simulating the Fracture Process of Rock, Rock Mech. Rock Eng. Vol. 37 (1) (2004), pp.25-56.

DOI: 10.1007/s00603-003-0014-z