Abstract:

The development trend of dualmode fullface tunnel boring machines is discussed, the design concept of dualmode fullface tunnel boring machines is presented and the main structure and applicability scope of dualmode fullface tunnel boring machines are described in detail. The study shows that, compared to singlemode tunnel boring machines, the applicability scope of dualmode fullface tunnel boring machines is more extensive, the availability of dualmode fullface tunnel boring machines is higher and the tunneling cost of dualmode fullface tunnel boring machines is lower. Conclusion is drawn that the dualmode fullface tunnel boring machine, which is the main development trend of tunnel boring machines, has a splendid future.

Key words: tunnel boring machine (TBM), dualmode, hard rock open mode TBM, soft ground balance mode TBM, segment erection, concrete lining