武汉地铁越江盾构隧道纵向不均匀变形及力学特性研究

地铁盾构隧道,尤其是大型跨江海的水下地铁盾构隧道,局部埋深通常要大于普通地铁盾构隧道,而且要承受较高的水压力作用;盾构隧道作为特长线性结构,其纵向刚度较小,对于外部荷载的变化较为敏感,由此产生的不均匀变形是隧道工程中不可忽视的问题。文章针对武汉地铁越长江盾构隧道工程,通过三维数值计算探讨了埋深变化、水压变化、地层变化及穿越刚性结构物等因素对越江盾构隧道纵向不均匀变形及受力状态的影响。

Study of the Longitudinal Uneven Deformation and Stress State of the Shield Tunnel Crossing the Yangtze River

Regarding subway shield tunnels,especially underwater subway tunnels with large cross sections,the local depth is usually greater than that of standard tunnels and therefore bears higher hydraulic pressure.As a linear structure,the longitudinal stiffness of a shield tunnel is relatively small,and it is more sensitive to the changes of the external load.The resulting uneven deformation should not be ignored.This paper discusses the effects of variations in overburdens,hydraulic pressures,and stratum as well as the passing of rigid structures on the longitudinal uneven deformation and stress state of a shield tunnel by three-dimensional numerical computations based on the shield tunnel crossing the Yangtze River in the Wuhan subway.