(广东省建筑设计研究院，广州510010)
［提要］在现有地铁隧道上部进行大开挖施工时如何确保隧道安全，是近年来城市建设中学术界和工程界普遍关注的问题。针对需要垂直跨越地铁五号线建设的广州市珠江新城地下空间项目，借助ANSYS软件建立了三维弹塑性有限元模型，模拟了地下空间施工过程中对原有地铁隧道的施工效应。数值分析结果表明，在拟定的隧道结构保护措施和施工方案下，施工期间原有地铁隧道没有安全隐患，并取得了一些有意义的结论和建议，为该工程的实施和类似项目的开展提供了指导作用和借鉴意义。
［关键词］地下空间；地铁隧道；大开挖；隧道保护；施工效应；ANSYS
3D Numerical Simulation on Spatial Influence During Large Excavation Construction upon the 5th Metro Tunnel/Xiang Qian,Chen Xing, Luo Chiyu,Lin Jinghua (The Architectural Design and Research Institute of Guangdong Province, Guangzhou 510010, China)
Abstract: How to guarantee the metro tunnel"s safety if large excavation construction happened upon is an important practice problem drawing exclusive attention presently in academic and industry field. Based on the Zhujiang New Town Guangzhou Underground Cavity which will be constructed cross the fifth metro tunnel, 3D FE model is built with ANSYS and the tunnel responses to excavation construction are simulated. The numerical analysis result indicates that there will be no potential risk of safety on the 5th metro tunnel during construction if applying proposed tunnel protection measures and construction scheme. Some useful conclusion and advices are acquired, which can be referred for this project and similar engineering.
Keywords: underground cavity; metro tunnel; heavy excavation; tunnel protection; construction effect; ANSYS