关键词: 大跨径隧道, 交叉隧道, 数值模拟

Abstract: The constructing station of Gaoyikou，which is a part of matching traffic engineering for Western International Convention and Exhibition Centre in Chongqing，was took as the object of study． The finite element software-ANSYS was used to simulate the cross site between the long-span subway station and the inward and outward channels． At the circunstances of entrances and no entrances，the mechanical behavior of the rock and initial support near the station intersection were compared． At the same time，the displacement of surrounding rock in the tunnel construction process was monitored， the variation of the surrounding rock displacement over time was analyzed，and the reliability of numerical analysis was verified． The result shows that the excavation of import and export has a significant impact on the displacement and stress of rock within rigion of intersection，especially，the displacement of the vault and bottom，and the stress in the vault，haunch and bottom changes significantly．

Key words: Long-span tunnel, intersection tunnel, numerical simulation