Hydro-Mechanical Coupled Analysis of the Variable Permeability Coefficient of Fractured Rock Mass

Abstract:

Based on the fluid-solid coupling theory, we describe the fractured rock mass as a continuous porous medium and consider the rock mass permeability coefficient a function of the stress and strain. By using the multi-physics coupling analysis software COMSOL, we achieved the dynamic change of permeability coefficient, and found that serious damage due to micro cracking occurred in the excavated damage zone of rock mass due to the yield and failure of rock mass. Corrodingly, permeability will remarkably increase, which is basically consistent with the experimental results. The simulations indicated the "indirect coupling" effect of seepage and stress. Therefore, the coupled analysis of the seepage and stress in fractured rock masses is important for the practical rock mechanics and rock engineering.

• Periodical: Applied Mechanics and Materials (Volumes 477-478)
• Pages: 531-534
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.477-478.531
• Online since: December 2013
• Authors: Yun Jie Zhang, Tao Xu*
• Keywords: COMSOL, Fluid Solid Coupling, Fractured Rock, Variable Permeability Coefficient

References

[1] Rutqvist J, Stephansson O．The role of hydro mechanical coupling in fractured rock engineering [J]．Hydrogeology J, 2003, 11: 7-40.

DOI: 10.1007/s10040-002-0241-5

[2] Wu Yanqing. Rock fracture system coupling model of the seepage field and stress field. Geological Hazards and Environmental Protection, 1996, 7 (1): 31-34.

[3] Zhang Bin, Li Weiming, et al: Numerical simulation for fluid-solid coupling characteristics in surrounding rock of underground water-sealed oil storage based. Journal of Engineering Geology, 2012, 20(5): 789-795.

[4] Biot M A．General theory of three-dimensional consolidation [J]．Appl. Phys, 1941, 12: 155-164.

[5] Louis C. Rock Hydroulics. In : Rock Mechanics, Ed. By L Muller, (1974).