Stability Analysis of Interaction between Portal Slope and Shallow Buried Super Large Section Tunnel

Wenjie Zhao

doi:10.54691/pxg07r22

Authors

Wenjie Zhao

DOI:

https://doi.org/10.54691/pxg07r22

Keywords:

Uphill; Tunnel; Numerical Simulation; Stability.

Abstract

In order to describe the interaction effect between tunnel excavation and uphill slope, taking Baishi No.2 tunnel as the engineering background, the numerical simulation method is used to reveal the interaction mechanism between tunnel excavation and uphill slope. The results show that (1) The safety factor of the stability of the slope at the entrance of the tunnel is significantly improved after brushing and strengthening. Then, with the excavation of the tunnel, the deformation of the slope gradually increases. After the excavation is completed, the safety factor of the slope gradually decreases to 1.52, but the slope is still in a stable state ;(2) After brush reinforcement, the pile-board structure improves the anti-sliding force of the slope and makes it in a stable state, which inhibits the influence of the sliding force of the slope on the deformation of the surrounding rock and the supporting structure, and the reinforcement effect is remarkable. The research results can provide reference for slope protection and reinforcement and tunnel stability construction.

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References

[1] C Yin, J F Wang , W J Zhou, et al. Discussion on deformation characteristics and control technology of tunnel orthogonal crossing landslide [J]. Railway Construction, 2021,61 ( 06 ) : 59-64.

[2] J.Z S Shao, F Cui, C L Li, et al. Study on influencing factors and treatment technology of silty clay tunnel slope stability [ J ].Journal of Railway Science and Engineering, 2020,17 ( 08 ) : 2055-2064.

[3] H G Wu, T Yang, H M Ma , etc. Study on pre-reinforcement mechanism and model test of tunnel-landslide system [ J ]. Journal of Rock Mechanics and Engineering, 2014,33 ( S2 ) : 3531-3538.

[4] J F Lv, J M Du , Z J Luo, et al. Study on the stability and supporting parameters of high and steep slope of Yankou Highway Tunnel [ J ].Modern Tunnel Technology, 2020,57 ( 05 ) : 116-124.

[5] D L Liu. The influence of tunnel excavation on slope stability [ J ]. Railway Construction, 2018,58 ( 07 ) : 68-71.

[6] C L Liu , J J Tong. Case analysis and comprehensive treatment of stability of landslide-tunnel oblique system-Taking the exit section of Chunping No.2 Tunnel on Daguan-Yongshan Expressway in Yunnan Province as an example [J].Tunnel Construction ( Chinese and English ), 2022,42 ( S2 ) : 161-167.

[7] Z Tao, M Qun. Numerical Analysis And Research of Entrance Slope of Shallow Buried Karst Tunnel[J].IOP Conference Series: Earth and Environmental Science,2020,455012176-012176.

[8] D Song , X Liu,Chen Z , et al.Influence of Tunnel Excavation on the Stability of a Bedded Rock Slope: A Case Study on the Mountainous Area in Southern Anhui, China[J].KSCE Journal of Civil Engineering,2020,25(prepublish):1-10.

[9] M Wu , Y Xi, H Guo. Strength Reduction Method Based Study on Tunnel Excavation Effect on Front Slope Stability[J].IOP Conference Series: Materials Science and Engineering,2020,741012007-012007.

[10] W X Du, T Y Gao .On the Stability and Control Technology of the Side Slope of the Tunnel Entrance [J]. Applied Mechanics and Materials, 2014,2916(488-489):737-740.