Author(s)

Rui Sun ^1,2

Affiliation(s)

¹ China Railway Changjiang Transport Design Group Co., Ltd., Chongqing, 401121, China
² School of Civil Engineering, Chongqing Jiaotong University, Chongqing, 400074, China

Corresponding Author

Rui Sun

ABSTRACT

In recent years, there are more and more road-railway crossings, among which road tunnels intersecting with railroad tunnels with small clearances is one of the crossings with higher safety risks. In order to analyze the impact of the new tunnel construction on the safety of the existing tunnel structure, the deformation of the existing tunnel at different stages of the new tunnel excavation was analyzed and calculated using the stratigraphic structure method modeling. The results show that the new tunnel under the existing tunnel excavation to the existing tunnel directly below the intersection of the location of the plastic zone through, the impact of this construction time should focus on strengthening the over-support protection; under the tunnel excavation caused the largest vertical displacement of the existing tunnel above, and the vertical displacement with the new tunnel excavation below the scale of increasing. The study shows that the main impact during the construction of new tunnels with small clearances through existing tunnels is the plastic zone penetration and vertical deformation of the cross section, which should be combined with construction excavation measures and overrun support design to take the necessary safety protection means.

KEYWORDS

Tunnel structure, small clearance underpass, stratigraphic structure method, plastic zone, displacement

CITE THIS PAPER

Rui Sun, Structural Safety Impact Analysis of New High Speed Rail Tunnel with Small Clearances under Highway Tunnel. Journal of Civil Engineering and Urban Planning (2023) Vol. 5: 48-57. DOI: http://dx.doi.org/10.23977/jceup.2023.050307.

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