城市轨道交通小净距隧道支护结构设计与施工技术研究

城市轨道交通小净距隧道中间岩柱体厚度远小于普通分离式双洞隧道,围岩变形和支护结构受力较为复杂。隧道施工引起的地层变形与两隧道间的净距有很大关系,如何合理地确定小净距隧道支护参数及施工步骤,确保施工顺利进行,已成为近年来人们普遍关注的一个现实问题。结合南京地铁小净距隧道围岩的受力、变形特点,对小净距隧道的支护结构设计与施工技术进行了研究,为大跨小间距隧道设计和施工提供参考数据和理论依据。

Design and Construction of Small Spacing Tunnel Support Structure

The distance between small spacing tunnel and the middle rock pillar is much smaller than the ordinary separation of a twin tunnel,the surrounding rock deformation and support force structure is therefore more complex.The formation caused by tunnel construction is decisive for the distance between two tunnels,and how to determine the reasonable parameters and the support construction steps so as to ensure the smooth construction,has become a real problem in recent years.Putting the force of the small clear space of Nanjing subway tunnel,the surrounding rock deformation characteristics into consideration,the small spacing tunnel support structure design and construction technology are studied,to provide more precise reference data and a theoretical basis for the design and construction of large span tunnels with small clear space.