摘要
介绍和总结了近年来浙江省连拱隧道修建过程中的施工方法、防排水设计等方面的一些经验教训。传统的连拱隧道采用直墙式中隔墙,由于施工工序繁多,中隔墙顶部V形围岩区受到多次施工扰动,极易产生塑性松弛而垮塌,而拱圈与中隔墙之间的纵向施工缝常常成为地下水渗透的通道,加之竖向排水管因施工工序冲突极易破坏和堵塞,严重影响了结构排水效果。鉴于传统连拱隧道在结构受力性能、防排水效果等方面的不足,提出了曲中墙式连拱隧道的结构形式。通过数值分析表明,后者的受力性能较前者合理,故能较好的控制住中隔墙顶部V形围岩区的塑性变形。并且通过将两侧主洞二次衬砌,各自独立成环、落底,从而根本上消除了墙顶施工缝处渗水的质量通病。另外,采用该结构形式能简化施工工序,便于机械化施工,从而极大地缩短施工工期。
The article expounds and summariZes some experience and lesson achieved in the process of multi-arch tunnel design and construction in Zhejiang Province. Traditional multi-arch tunnel adopts linear middle-wall, which consists of complicated construction steps. In general, as a V-shape rock area up, the middle-wall will be disturbed several times in construction process, and plastic deformation is so obvious as to result in collapsing. Besides, the longitudinal construction joint between the arch part and middle-wall, which always becomes the penetration passage of underground water, as well as incidentally clogging vertical drainage tube in middle-wall greatly affects waterproof performance. Due to the shortcomings mentioned above on structure mechanical and waterproof performance in traditional multi-arch tunnel with linear middle-wall, a novel multi-arch tunnel with curvilinear middle-wall is put forward. It＇s proved by numerical analysis that the new structure has much more excellent mechanical performance. As a result, the plastic deformation in the V-shape rock area up the middle-wall is controled effectively. As for waterproof performance, the second lining of the new structure is separated from the middle-wall. For the unattached second lining has no construction joint, water penetration via construction joint, which is a common quality defect in traditional multi-arch tunnel, is avoided. What is more, the new structure can simplify construction steps and shorten construction period taking advantage of mechanical operation.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2005年第A02期5527-5530,共4页
Chinese Journal of Rock Mechanics and Engineering
关键词
隧道工程
连拱隧道
设计
防排水
tunneling engineering
multi-archtunnel
design
waterproof anddrainage
