Influence of Anisotropic Rock on Tunnel Stability with Consideration of Fluid-Solid Coupling

Abstract:

Article Preview

In general, rock mass is anisotropic because of presence of stratification, foliation or joints in it. In this paper we considered how the angle of anisotropy influences the stability of tunnel. By using COMSOL Multiphysics, fluid and 2D plane models are coupled to analyze stress-strain state, failure shape and water flow characteristic around tunnel for angle range from 0° to 90° with a interval of 15°. Results show that in condition of vertical force of initial stress field larger than horizontal one, failure district is maximum for θ=40° and minimum for θ=90° where the strength of horizontal direction in anisotropic rock is smaller than the vertical one. In this case failure is mainly developed in roof and bottom. When the horizontal strength of anisotropic rock is larger than the vertical, results reverse. In anisotropic rock, the more the direction of larger permeability is coincident with one of source underground water acted, the more water flows into tunnel.

Info:

Periodical:

Edited by:

Xuejun Zhou

Pages:

2101-2107

Citation:

R. H. Hwang et al., "Influence of Anisotropic Rock on Tunnel Stability with Consideration of Fluid-Solid Coupling", Applied Mechanics and Materials, Vols. 90-93, pp. 2101-2107, 2011

Online since:

September 2011

Export:

Price:

$38.00

[1] M.M. Schwartz: Composite material handbook, New York, MeGraw-Hill (1984).

[2] COMSOL A B: COMSOL multiphysics version 3. 2[M], Stockholm. [s. n] (2005).

[3] S.G. Lekhnitskii: Theory of elasticity of an anisotropic body, Mir Publisher, Mosow (1981).

[4] J. Liu, P. Han and A. Nakayama: Proceedings of the international symposium on geomechanics and geotechnics: From to Macro, shanghai, china vol. 1 (2010), pp.415-420.

[5] D. Liu and Z. Tan: Proceedings of the international symposium on geomechanics and geotechnics: From to Macro, shanghai, china vol. 2 (2010), pp.905-912.

[6] J.P. Carter and J.R. Booker: Proceeding of the international symposium ACMIAME, china (1993), pp.25-33.

[7] M. Lespinasse, J. Sausse: Quantification of fluid flow: hydro-mechanical behavior of different natural rough fractures, Journal of Geochemical Exploration Vol. 69-70 (2000), pp.483-486.

DOI: https://doi.org/10.1016/s0375-6742(00)00111-4

[8] A.P. Oron, B. Berkowitz: Flow in rock fractures, Water Resources Research Vol. 34 (1998), pp.2811-2825.

[9] Z. Wen G.H. Huang and H.H. Zhan: A numerical solution for non-Darcian flow to a well in a confined aquifer using the power law function, Journal of Hydrology Vol. 364 (2009), pp.99-106.

DOI: https://doi.org/10.1016/j.jhydrol.2008.10.009

[10] Y.F. Lu and J.F. Shao: Modeling of anisotropic damage in brittle rock under compression dominated stress[J], Int. J. Numer. Anal. Meth. Geomech. Vol. 26 (2002), pp.230-247.

DOI: https://doi.org/10.1002/nag.230

[11] J.J. Liao and B. Acamei: Surface loading of anisotropic rock masses, Journal of Geotechnical Engineering ASCE Vol. 17 (1991) pp.1779-1800.

DOI: https://doi.org/10.1061/(asce)0733-9410(1991)117:11(1779)

[12] Y.J. Cui, A.M. Tang, C. Loiseau and P. Delage: Proceedings of the international symposium on geomechanics and geotechnics: From to Macro, shanghai, china vol. 1 (2010), pp.23-28.