Numerical Study on the Relationship of the Axis Orientation of Deeply Buried Circular Tunnel and the Direction of Horizontal In Situ Stress

Abstract:

Deeply buried tunnels usually lie in high stress fields, whose horizontal stress which is not uniform is far larger than vertical stress, and their stability is dominated by the original in-situ stresses. With three-dimensional nonlinear finite element method, the axis orientation effects of tunnel on the displacement and stability of two types of surrounding rocks are studied systematically for one water diversion project. The tunnel lies in different original stress fields whose maximum horizontal principal stress is parallel with or perpendicular to the axis and lies in different kinds of rocks. The numerical analysis results show that the plastic zones develop in side wall of tunnel mostly when the horizontal maximum principal stress is parallel with the tunnel axis while the plastic zones distribute in the top and bottom of tunnel when the horizontal maximum principal stress is perpendicular to the tunnel axis. It is concluded that the principle of tunnel axis should be parallel with horizontal maximum principal stress regulated by the “specification for design of hydraulic tunnel” is not available for the stability of tunnel always.

• Periodical: Applied Mechanics and Materials (Volumes 117-119)
• Pages: 1723-1727
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.117-119.1723
• Online since: October 2011
• Authors: Jun Qi Wang
• Keywords: Deeply Buried Tunnel, Deformation and Stability, Finite Element Method (FEM), In Situ Stress, Tunnel Axis Orientation

References

[1] SL279-2002. Specification for design of hydraulic tunnel (2006, In Chinese)

[2] General Institute of hydraulic plan and design, Information net for hydraulic underground structure.. Design manual for underground structure of hydraulic and hydraulic-electrical (Sichuan Science and Technology Press, Chengdu 1993, In Chinese)

[3] Qiuyan Fan. Journal of Coal Science & Engineering, 15(3) (1990, In Chinese), pp.62-70

[4] Lan Qi, Qichao Ma. Chinese Journal of Rock Mechanics and Engineering, 19(z1) (2000, In Chinese), pp.1120-1123

[5] Li Li, Jiangda He, et al. Journal of Sichuan University(engineering science edition), 35(3) (2003, In Chinese), pp.35-37

[6] Guojian Shao, et al. Hydrology and Engineering Geology, 30(6) (2003, In Chinese), pp.44-48

[7] Yiwen Zhu，Kejian Huang，Wei Li. Chinese Journal of Rock Mechanics and Engineering, 23(8) (2004, In Chinese), pp.1344-1348

[8] W. J. Gale，R. L. Bladkwood. Int J Rock Mech Min Sci & Geomech Abstr, 24(3) (1987), pp.165-173

[9] M. Abdel-Meguid, R. K. Rowe, K. Y. Lo. Can. Geotech. J. 40 (2003), pp.1208-1224

[10] Zhuo Zhuang, Fan Zhang, Song Cen. ABAQUS nonlinear finite element method analysis and application (Science Press, Beijing 2005, In Chinese)