深水超长沉管隧道接头及止水带地震响应研究

Research on joints and gasket seismic response of deep-water long immersed tube tunnels

摘要:

随着我国经济社会的发展，由于交通和经济的需要，越来越多的跨海隧道和越江隧道被修建。沉管隧道作为一种简便省事的隧道形式，在我国使用的例子还较少，仅有广州珠江隧道、宁波甬江隧道、宁波常洪隧道、上海外环线泰和路隧道。港珠澳沉管隧道作为我国正在修建的世界上最长的沉管隧道（长5664m），将奠基在海平面以下40米左右的深度。本文依托港珠澳沉管隧道工程，建立了三维实体连续有限元模型，对这条深水超长沉管隧道在地震作用时接头处的内力和位移情况以及止水带的压缩与变形进行了详细的模拟与研究，重点分析了地震作用时沉管隧道接头处的相对位移（包括管节接头和节段接头）、节段接头的减震作用、管节接头处GINA止水带的变形，为施工和运营期的安全与维护提供必要的指导和依据。

Abstract:

With China's economic and social development, a growing number of cross-harbor tunnels and cross-river tunnels are constructed for the need of transportations and economics. Immersed tube tunnel is a simple and easily-built tunnel and still less to the use in China, only Guangzhou Pearl River Tunnel, Ningbo Yongjiang tunnel, Ningbo Changhong tunnel and Shanghai outer ring tunnel. Hong Kong-Zhuhai-Macao Cross-Harbor Tunnel which is being built is the world's longest immersed tube tunnel (length 5664m) and will be based in the depth of about 40 meters below sea level. This paper is based on Hong Kong-Zhuhai-Macao Cross-Harbor Tunnel Project, and the three-dimensional continuous model is established to research joints’ forces and displacements and GINA gaskets’ deformation. It focuses on joints’ relative displacement (including pipe joints and segment joints), reducible seismic effect of segment joints and GINA gaskets’ deformation. There is an important guiding significance for design and construction of immersed tube tunnel.