双盾敞开式TBM针对性设计与工程应用

Targeted Design and Engineering Application of Double-Shield Open TBM

敞开式TBM(Tunnel Boring Machine)适用于以自稳围岩为主的隧道施工,具有施工速度快、优质、安全、环保等优点,应用越来越广泛,小直径敞开式TBM应用总体较少。为了解决小直径敞开式TBM结构设计与设备布局困难、作业空间狭小、初期支护施作困难等问题,提高小直径TBM适应性,研制了新型敞开式TBM,即双盾敞开式TBM。广州北江引水、十堰水源等工程实践证明,双盾敞开式TBM总体设计合理,具有作业空间友好、法向锚杆锚固效果显著提升、系统喷混到掌子面距离显著缩短等优势,在自稳能力较好地质条件下具有非常高的适应性,实现了持续、均衡、快速施工,但不良地质条件下还需要从设备技术和施工技术方面继续深入研究。

Open TBM(Tunnel Boring Machine)is suitable for tunnel construction mainly based on self-stabilized surrounding rock,with advantages such as fast construction speed,high quality,safety,and environmental protection.It is more and more widely used,while small diameter open TBM is generally less commonly used.In order to solve the problems of small diameter open TBM structure design and equipment layout,narrow working space,and difficulty in initial support construction,and improve the adaptability of small diameter TBM,a new type of open TBM,namely the double shield open TBM,has been developed.The engineering practices of Guangzhou Beijiang Water Diversion and Shiyan Water Source have proven that the overall design of the double shield open TBM is reasonable,with advantages such as friendly working space,significantly improved anchoring effect of normal anchor,and significantly shortened distance from the front system spraying concrete to the tunnel face.It has high adaptability under geological conditions with good self-stability ability,achieving continuous,balanced,and rapid construction.However,under adverse geological conditions,further research is needed in terms of equipment technology and construction technology.