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

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.