Construction Methods for Long-Span and Bifurcation Tunnel Structure

Abstract:

Long-span and bifurcation tunnel engineering is not very common in underground engineering field. It is difficult to construct this complicated structure because of the numerous influencing factors. In order to find out the optimum construction method for long-span and bifurcation tunnel to guarantee construction security and stabilization of this project, six construction methods were compared and analyzed by using numerical simulation. The results show that: (1) The excavation of confluence segment and small interval tunnel can affect each other but the confluence segment is the crucial part of the whole project. (2) The vertical brace determines surrounding rock and preliminary support stabilization in confluence segment. (3) The central concrete between main tunnel and ramp tunnel is the key point to guarantee the construction security and stabilization of small interval tunnel. The above results certainly contribute to research and develop new types of construction methods for long-span and bifurcation tunnel engineering.

• Periodical: Applied Mechanics and Materials (Volumes 580-583)
• Pages: 983-986
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.580-583.983
• Online since: July 2014
• Authors: Chun Lei Xin, Bo Gao
• Keywords: Bifurcation Tunnel, Construction Method, Long-Span Tunnel, Numerical Simulation, Tunnel Engineering

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