1. An experimental study on development of oval section TBM.
- Author
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Takatsu S., Rapid excavation and tunnelling conference Las Vegas, Nevada 22-Jun-9725-Jun-97, Emoto T., Imaoka H., Minami Y., Suzuki T., Takatsu S., Rapid excavation and tunnelling conference Las Vegas, Nevada 22-Jun-9725-Jun-97, Emoto T., Imaoka H., Minami Y., and Suzuki T.
- Abstract
Experimental excavations were carried out on artificial concrete with or without boulders using oval section TBMs with a cutterhead diameter of 2.4 m and inclination angles of 40 and 30 degrees. Breaking patterns of artificial boulder blocks indicated that the machine carried out successive breaking as in the ordinary breaking mechanism, regardless of the inclination angle. It was found that the effective thrust applied on the cutterhead and the lifting force were proportional to the angle of inclination. It was confirmed that the circular and the oval section TBM had the same excavation speed if the same thrust was applied. Hydraulic pressure measurements of the cutter motor showed that there were no losses in the excavation torque. The load working on the cutter bearing was proportional to the thrust in both the circular and elliptical excavations. It was found that the oval section TBM can be used instead of a conventional circular TBM and can give a minimum overbreak and a superior stabilisation performance., Experimental excavations were carried out on artificial concrete with or without boulders using oval section TBMs with a cutterhead diameter of 2.4 m and inclination angles of 40 and 30 degrees. Breaking patterns of artificial boulder blocks indicated that the machine carried out successive breaking as in the ordinary breaking mechanism, regardless of the inclination angle. It was found that the effective thrust applied on the cutterhead and the lifting force were proportional to the angle of inclination. It was confirmed that the circular and the oval section TBM had the same excavation speed if the same thrust was applied. Hydraulic pressure measurements of the cutter motor showed that there were no losses in the excavation torque. The load working on the cutter bearing was proportional to the thrust in both the circular and elliptical excavations. It was found that the oval section TBM can be used instead of a conventional circular TBM and can give a minimum overbreak and a superior stabilisation performance.
- Published
- 1997