开敞式TBM过类泥石流不良地质洞段施工处理技术

Construction Technology for Open TBM Tunneling through in Debris-flows-like Adverse Geological Tunnel Section

摘要:

开敞式TBM在掘进过程中，往往会遇到断层破碎带，目前业界已经有相应的处理方式，但是在遇到类泥石流洞段时，单独依靠目前TBM自身条件及已有的处理方式很难实现顺利通过，需要采取特殊的施工处理措施相互配合才能通过。本文依托吉林引松供水项目三标段类泥石流不良地质洞段的处理，形成了一套完整的开敞式TBM过类泥石流不良地质洞段施工处理技术，即在碎块石夹杂断层泥段采用超前管棚支护，在类泥石流不良地质洞段采用堵水灌浆加固技术并配以喷锚喷网 钢拱 模筑混凝土的联合支护技术。工程实践验证了该技术的可行性。

关键词:类泥石流洞段;管棚;灌浆;TBM施工处理技术

Abstract:

Fault fracture zones are often encountered in open TBM tunneling process, and the solution has already been put forward by the industry. But in debris-flows-like adverse geological conditions, it is hard for TBM to get through only by its own capacity and the existing treatment methods, it is necessary to take special construction measures working together. Based on the treatment of debris-flows-like adverse geological tunnel section in the third bid section of Jilin water supply project by diverting Songhua River, a complete set of construction technology is formed for open TBM tunneling through debris-flows-like adverse geological tunnel section, that is advanced pipe roof support used in fragment stones and fault gouge section, and water plugging & grouting reinforcement technology combining with combined support technology of spray anchor net steel arch formworking concrete used in debris-flows-like adverse geological tunnel section. The engineering practice proves the feasibility of this technology.

Key words:debris-flows-like tunnel section; pipe roof; grouting; construction technique for TBM