大跨径地铁车站交叉口数值分析

以在建的重庆.西部国际会展中心配套市政交通工程高义口车站为研究对象,采用有限元数值软件ANSYS三维数值模拟大跨径地铁车站与出入口通道交叉部位,在有出入口与无出入口情况下,对车站交叉口附近围岩和初期支护力学行为进行对比分析。同时,在隧道施工过程中对围岩位移进行监测,分析围岩的位移状态随时间的变化规律,验证数值分析可靠性。分析结果显示,出入口开挖对交叉口区域内围岩的位移和应力都产生显著影响,交叉口拱顶和底部位移影响较大,应力在拱顶、拱腰和底部都变化明显。

Numerical Analysis of Intersection of Long-Span Subway Station

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.