地震荷载作用下沉管地基砂垫层液化的可能性

Liquefaction possibility of immersed tunnel's sand ground under earthquake

以广州仑头—生物岛沉管隧道为背景,采用二维动力有限元模拟方法,分析了地震荷载作用下沉管隧道地基的动力响应,得到了地震荷载作用下地基土的动剪应力分布;通过对试验资料的分析,得到了沉管隧道地基砂垫层的抗液化剪应力,以此分析了沉管隧道地基土在地震荷载作用下的液化可能性,并提出了相应的抗液化措施,可供沉管隧道的抗震设计参考。

Taking Luntou-Shengwudao immersed tube tunnel in Guangzhou as an example, the paper analyzes the seismic response of the immersed tube tunnel by dynamic FEM. According to these models, the dynamic shear stress distribution of ground of the immersed tunnel is calculated. By analyzing the experiment data of the site, the liquefaction-resistant shear stress of the sandground is obtained. Thus the possibility of sand ground liquefaction of the immersed tube tunnel is analyzed so as to give reference to future design and construction of immersed tube tunnel.