Author(s)

Fei Liang ¹

Affiliation(s)

¹ Guizhou Transportation Planning, Survey and Design Research Institute Co., Ltd, Guiyang, Guizhou, 550081, China

Corresponding Author

Fei Liang

ABSTRACT

In order to protect the safety and normal operation of the existing tunnel, and to ensure the safety of the tunnel excavation construction and the later operation of the existing tunnel under the small net distance, the stress field and deformation response mechanism in the excavation process of the small net distance are studied to provide the decision basis for the design and construction. Using the numerical simulation method and theoretical calculation analysis method compared grouting reinforcement method, bench method and MJS method (comprehensive high pressure injection method) three kinds of reinforcement after the existing tunnel, small net distance through the existing tunnel shield process stress field and deformation mechanism, and the feasibility of three method, safety and economy of comparative analysis. The results show that the deformation of the grouting reinforcement method does not meet the specification requirements, the MJS method deformation 3.387mm, the bench method deformation is 9.754mm, the deformation meet the specification requirements, but the MJS method cost is twice the bench method, so the principle of safety and economic feasibility, suggest the existing tunnel reinforcement before the tunnel excavation.

KEYWORDS

Small Net Distance, Tunne, Grouting Reinforcement Method, Bench Method, MJS Method

CITE THIS PAPER

Fei Liang, Study on Stress and Strain Response Mechanism of Tunnel Excavation under Small Net Distance. Journal of Civil Engineering and Urban Planning (2024) Vol. 6: 190-198. DOI: http://dx.doi.org/10.23977/jceup.2024.060225.

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