盾构隧道纵向变形性态研究分析

随着城市地铁和市政工程建设的发展 ,由于软土隧道发生过量的不均匀纵向变形对隧道内力、变形及正常运营的影响日渐突出。本文以盾构法隧道为基础 ,结合工程实例 ,对软土盾构隧道纵向变形和结构性态进行讨论 ,介绍了盾构隧道纵向变形的影响因素 ,重点分析了土性不均匀与荷载变化两大主要因素对隧道纵向变形的影响 ,最后给出了具有一定指导意义的结论。

Research and Analysis on Longitudinal Deformation Characteristics of Shield Tunnel

With the development of metro and public works, to the problem caused by the longitudinal deformation of soft ground tunnel, more importance has been attached. The influence of longitudinal deformation on the internal force and deformation of structure can't be ignored. Based on the shield tunnel data combined with those of the real projects, the longitudinal deformation and structure characteristic of tunnel are discussed, and the causes of longitudinal deformation of the tunnel are presented. The variation of soil behavior and the non uniform distribution of load along the shield tunnel are two major factors and their effect on the longitudinal deformation of tunnel is discussed. At last, some guiding conclusions are drawn.