关键词: 敞开式TBM, 环形钢构, 支护, 施工工法, 设备配套

Abstract: Although the TBM tunneling method is a highly mechanized, refined and advanced construction technology, but the advantages of open TBM is unable to give full play in rapid excavation when facing adverse geological conditions such as broken rock zone. On the basis of making full use of the tunnel supporting concept of "New Austrian method", a new support construction method was put forward, i.e. when confronting with unfavorable geological conditions, under the protection of the TBM shields , the fragments of annular steel structure manufactured as required in standardized and batch production are quickly assembled into a tunnel support structure for exerting function immediately by special installation equipment. When TBM moves forward, the structure is used to replace the shield to support surrounding rock, and shotcrete-bolt support is conducted under the protection of the annular steel structure. The engineering practice proves that the operation process under the new support method is safer and also easier to be controlled, furthermore, the driving speed can be increased from 5~10m to 15~25m every day.

Key words: open TBM, annular steel structure, support construct, construction method, equipment package