Xinrong Liu, Lojain Suliman, Xiaohan Zhou, Ahmed abd elmageed

Abstract:

The majority of tunneling projects entail designing and building two adjacent tunnels, referred to as twin tunnels. Because the interaction of two parallel tunnels within a slope affects the slope's stability, it's vital to understand the impact of this interaction on the stability. In this paper, the vertical displacement (settlement) of a road above twin tunnels in a fill slope was researched and validated using field measurements. This case study is located in Guizhou province in kaili city in south west of china. The most important part of this study is that the tunnels ‘entrance is in fill soil, which constitutes an unstable body for the tunnel and the slope, especially during excavation. Piles foundation have been used to improve the slope stability. Predictions of settlement were made using the finite element method (FEM) with PLAXIS 3D program, as well as the analytical solution method (new equation). The results appear that the largest displacement was due to the fill entrance. And without the fill, the displacement was too small with non-overlapping shape of displacement. Furthermore, with certain restrictions, the new analytical solution equation is suitable for twin tunnels in a slope.

Keywords: Tunnel; Excavation; PLAXIS 3D; piles; Settlement; fill, FEM.

Date Published: November 4, 2022
DOI: 10.11159/ijci.2022.013

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