仰拱形式对大跨断面隧道地震反应分析的影响

以某大跨断面铁路车站隧道为研究对象,采用大型有限元分析软件ANSYS对隧道不同曲率的仰拱形式进行了地震反应分析。计算结果表明:大跨断面隧道的抗震性能较差;仰拱曲率变大,隧道结构受力减小,有利于隧道结构抗震;大跨断面隧道结构的薄弱环节主要出现在仰拱和右拱腰处。研究成果可作为大跨断面隧道抗震设计的参考依据。

Analysis on Influence of Invert Pattern on Seismic Response in the Tunnel with Long Span Section

Taking a long span tunnel of a railway station as an in-stance,the paper analyses the seismic response of invert pattern with different curvature of tunnel by the finite element softwareANSYS.The results indicates that the seismic behavior of tunnelwith long span is rather poor;The structure stress of tunnel de-creases with the curvature of the invert arch largen,which helpto earthquake resistance of tunnel structure;the weakness of long span tunnel is mainly at the top arch and the right arch side.The research could be considered as a reference for aseismic design of long span tunnel.