Abstract：
At present there is no uniform standard for the section design of a three-lane tunnel; a reasonable section shape design could save cost and ensure the safety of the tunnel. Based on the Longtanwan tunnel, a numerical simulation of the sections using various aspect ratios in the aspects of stress distribution, displacement distribution, and forces applied on the lining after tunnel excavation was performed with ANSYS finite element software. The multi-objective optimization of such desired values as maximum normal stress, crown settlement, excavation area, and lining perimeter was taken by the analytic hierarchy method. This paper presents the optimized section shape regarding the Longtanwan tunnel.
2012, Vol. 49 