【作者】 李强；

【导师】 王明年；

【作者基本信息】 西南交通大学 ， 桥梁与隧道工程， 2005， 硕士

【摘要】 本文在综合分析当前连拱隧道发展的基础上，依托交通部西部课题连拱隧道建设关键技术研究为实际背景，并以解决连拱隧道施工过程空间力学效应和支护时机为出发点，通过对深、浅埋连拱隧道两种情况，共计16种工况的三维数值模拟分析，应用有限差分方法FLAC3D，研究了复杂施工工序下，连拱隧道受力特征、支护时机和空间效应等问题。 通过对连拱隧道的三维数值模拟分析，得出了在不同的地质及环境条件下，各种工况的连拱隧道基本受力规律、中墙的受力性能和适用条件、连拱隧道的合理修建方法、工作面之间的合理间距、掌子面与衬砌结构的合理间距、周边位移变化规律及控制基准、临时支护一次拆除的合理时机、爆破振动对二次衬砌和中墙的影响。提出了适应各类围岩情况下的合理开挖方法、支护模式和支护时效，充分揭露复杂施工条件下，连拱隧道的受力特性、支护时机和空间效应等问题。结果表明，连拱隧道的受力状态不仅与施工工艺、支护体系的刚度和强度有关，而且与支护时机、空间效应等有关，同时也表明：在复杂的施工工序下，支护时机和空间效应起控制作用。该项研究对今后连拱隧道工程的设计和施工具有一定的指导意义。更多还原

【Abstract】 The thesis is based on the comprehensive analysis of current dual-arch tunnel research results. Combined with the key technology research on the Dual-arch Tunnel in the western region by Ministry of Communications. This thesis aims to solve the problems of spatial effect and supported occasion in process of dual-arch tunnel construction. Deep-embedded and shallow-embedded dual-arch tunnels with sixteen works are separately simulated by three-dimensional numerical method. Program of finite difference method FLAC3D is applied to study stress characteristics, supporting opportunity and spatial effect of dual-arch tunnel in the condition of complicated construction procedures.By 3-D finite element analysis of dual-arch tunnel, it draws the conclusion on the following factors : basic stress law , stress performance and applicable condition of each kind of midboard reasonable construction technology, reasonable spacing interval between working face . reasonable clearing between the pignon and lining structure changing regulation and controlling basis of rim displacement proper opportunity of temporary lining striking and blasting vibration to secondary lining and midboard of each kind of work condition in every geologic and tolography condition. It puts forward reasonable construction technology supporting mode and supporting ageing under the different geology condition .well discloses stress characteristic , supporting opportunity and spatial effect of dual-arch tunnel in the condition of complicated construction procedures. The results show that stress of dual-arch tunnel relates not only with construction technology rigidity and strength of support structure, but also with supporting occasion and spatial effect etc. The results also show that the stress of dual-arch tunnel is controlled by supporting opportunity and spatial effect in the condition of complicated construction procedures. These results should be of guiding significance to design and construct dual-arch tunnel engineering.更多还原