大跨隧道临时支护拆除及二次衬砌施工数值模拟分析

Numerical Simulation Analysis of Removal of Temporary Supporting and Construction of Secondary Lining of Large-span Tunnel

对广州地铁区庄站浅埋暗挖大跨隧道采用荷载结构法,运用大型通用有限元分析软件ANSYS模拟隧道拆除支撑及2次衬砌施工的动态力学过程,分析研究施工过程各施工步序2次衬砌和初期支护内力、位移变化规律及隧道各施工阶段的施工安全状态,为该隧道设计施工提供科学依据。

For shallow embedded and concealed excavation large-span tunnel at Ouzhuang Station of Guangzhou Metro, load structure method is adopted, and large-size universal finite element analysis software ANSYS is used to simulate the dynamic mechanical process of the removal of temporary supporting and construction of secondary lining of the tunnel to analyze and investigate the variation laws of internal force and displacement of the secondary lining and initial supporting in various procedures during construction and security states in all construction stages so as to provide the scientific bases for design and construction of the tunnel.