Abstract
It is very significant to maintain the stability of surrounding rock during the entire lifetime of the tunnel. Generally speaking, the stability of the surrounding rock in the portal section of the tunnel is the worst. Therefore, it is meaningful to study the instability mechanism and factors affecting the instability of the surrounding rock in the tunnel portal section. In this paper, we studied the stability of tunnel surrounding rock based on a novel double strength reduction method (the strength reduction shortest path method). The double strength reduction method was used to reduce the cohesion and internal friction angle with different reduction factors in the stability analysis of surrounding rock. We used the overall safety factor to evaluate the stability of the tunnel. The smaller the overall safety factor, the more likely the tunnel is to lose stability. The influence of strength parameters of surrounding rock on the stability of the portal section was discussed emphatically. The results show that: As the reduction ratio \(\lambda \) increases, the length of the strength reduction path first decreases and then increases, which indicates that there is a shortest strength reduction path; It is reasonable to take the drastic change of the vault displacement as the instability criterion; As the initial internal friction angle and the initial cohesion increase, the length of the strength reduction shortest path and the overall safety factor increase, in which the effect of the internal friction angle is more significant.
This paper can provide a new method for studying the stability of the tunnel portal section and provide a useful reference for future tunnel construction.
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References
Perazzelli, P., Leone, T., Anagnostou, G.: Tunnel face stability under seepage flow conditions. Tunn. Undergr. Space Technol. 43, 459–469 (2014)
Anagnostou, G., Perazzelli, P.: Analysis method and design charts for bolt reinforcement of the tunnel face in cohesive-frictional soils. Tunn. Undergr. Space Technol. 47, 162–181 (2015)
Lee, I.M., Lee, J.S., Nam, S.W.: Effect of seepage force on tunnel face stability reinforced with multi-step pipe grouting. Tunn. Undergr. Space Technol. 19(6), 551–565 (2004)
Pan, Q., Dias, D.: Upper-bound analysis on the face stability of a non-circular tunnel. Tunn. Undergr. Space Technol. 62, 96–102 (2017)
Griffiths, D.V., Lane, P.A.: Slope stability analysis by finite elements. Geotechnique 49(3), 387–403 (1999)
Lian, Z., Han, G., Kong, X.: Stability analysis of excavation by strength reduction FEM. Chinese J. Geot. Eng. 23(4), 407–411 (2001)
Zhang, P., Chen, Z.: Influences of soil elastic modulus and Poisson’s ratio on slope stability. Rock Soil Mech. 27(2), 299–303 (2006)
Tang, F., Zheng, Y.: Mechanism analysis on dual reduction factors about the progressive failure of slope. Chin. J. Undergr. Space Eng. 4(3), 436–441+464 (2008)
Tang, F., Zheng, Y.: Analysis on safety reserve of slope with two strength reduction factor. J. Chongqing Jiaotong Univ. (Nat. Sci.) 26(4), 95–100 (2007)
Tang, F., Zheng, Y.: Mechanism analysis on dual reduction factors about the progressive failure of slope. Chin. J. Undergr. Space Eng. 4(3), 436–441+464 (2008)
Tang, F., Zheng, Y.: Effect on safety factors in different definitions based on strength margin. J. Civil Arch. Environ. Eng. 31(3), 61–65+97 (2009)
Zheng, Y., Zhao, S., Song, Y.: Advance of study on the strength reduction finite element method. J. Logist. Eng. Univ. (03), 1–6 (2005)
Zhang, K.: Three-dimensional slope stability and failure analysis using shear strength reduction finite element method (SSR-FEM). Dalian University of Technology (2011)
Isakov, A., Korneyev, D.A., Moryachkov, Y.: Two-parameter criterion of road bed stability. In: Proceedings of Engineering Geology, Soil Mechanics and Foundations. Novosibirsk, Russia: [s. n.], pp. 31–38 (2010)
Isakov, A., Moryachkov, Y.: Estimation of slope stability using two-parameter criterion of stability. Int. J. Geomech. 14(3), 613–624 (2014)
Chen, Z.: On Pan’s principles of soil and rock stability analysis. J. Tsinghua Univ. Sci. Technol. 38(1), 3–6 (1998)
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Project (2018JJ2519) supported by Hunan Provincial Natural Science Foundation of China.
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Wang, W., Gao, G., Hu, M., Zhang, Y., Tao, H. (2021). Study on Stability of Tunnel Portal Section Based on Strength Reduction Shortest Path Method. In: Shu, S., Wang, J., Souliman, M. (eds) Advances in Geotechnical Engineering & Geoenvironmental Engineering. GeoChina 2021. Sustainable Civil Infrastructures. Springer, Cham. https://doi.org/10.1007/978-3-030-80142-7_6
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DOI: https://doi.org/10.1007/978-3-030-80142-7_6
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