The Measures and Construction Methods about the Open Full-face Tunnel Boring Machine Going through the Bad Geology Area

Research purposes: Two sets of TB880E TBM manufactured by German Wirth Corporation were introduced in 1997 by the Railway Ministry. These machines’ structures and technical data were designed according to Qinling Super Long Tunnel of Xi’an-Ankang Railway, which were applicable to excavating construction of hard rock tunnel, that was, Open Hard Rock Tunnel Boring Machine (TBM). It is still a difficult problem suffering the world to excavate through the soft surrounding rock. Research methods:This paper researched the preventive measures and construction methods on TBM construction accidents in terms of Taohuapu No.1 tunnel construction practice of Xi’an-Nanjing Railway. Research conclusions:This paper proposed a 20-Chinese-word principle, “Advance prediction, lining construction, data adjustment, proper promotion, and disturbance reduction”. How to deal with landslide was also described in the paper, in conclusion, “Anchor spraying in time, steel-rack sealing, steel pipe lap-welding, otter board combining, slump blocking, and dense refilling”. TBM excavating through the section of unfavorable geological condition smoothly and safely was validated in Taohuapu No.1 tunnel construction