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Qi G.,Xian Jiaotong University | Zhengying W.,Xian Jiaotong University | Fei H.,China Railway Engineering Equipment Co. | Hao M.,Xian Jiaotong University
Journal of Mechanical Science and Technology | Year: 2015

To overcome the drawbacks of the large flat-face TBM cutter head (for example, enormous rock cutting forces and eccentric forces cause excessive deformation of the cutter head and damage to the main bearing), a two-stage cutter head is introduced. The two-stage cutter head was designed using grey relational analysis method according to the flat-face cutter head applied in the West Qinling Tunnel, China. The mechanical performance analysis models of the two cutter heads in the layered-banded rock (LBR) mixed ground were built to calculate the cutter heads’ rock cutting thrust and torque, eccentric forces and overturning moments. The two cutter heads’ deformation and stress distribution were also compared. We concluded that with the same penetration, the thrust, torque, eccentric force, overturning moment, deformation and maximum stress of the two-stage cutter head were smaller than those of the flat-face cutter head. © 2015, The Korean Society of Mechanical Engineers and Springer-Verlag Berlin Heidelberg. Source

Geng Q.,Xian Jiaotong University | Wei Z.,Xian Jiaotong University | Meng H.,Xian Jiaotong University | Zhuo X.,China Railway Engineering Equipment Co. | And 3 more authors.
Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University | Year: 2015

In order to overcome the drawbacks that large cutting load and eccentric load on the TBM's large diameter (>10 m) flat-face cutterhead that will cause excessive deformation of the cutterhead and damage of the main bearing, a two-stage cutterhead was introduced. The two-stage cutterhead was designed in grey relational analysis method based on the flat-face cutterhead applied in West Qinling tunnel project. The mechanical performance analysis models of the flat-face cutterhead and the two-stage cutterhead under the mixed-face rock ground condition were built to compare the cutterheads' rock cutting thrusts and torques, as well as the eccentric forces and moments. And finite element models of the two cutterheads under uniform rock ground condition were built to compare the cutterheads' deformation and stress distribution. The results show that the rock cutting thrust, the rock cutting torque, the eccentric force and moment, the deformation and maximum stress of the two-stage cutterhead are smaller than that of flat-face cutterhead, which illustrates that the rock cutting loads are distributed into two stages of the cutterhead, and at the same time, the stiffness of the cutterhead is increased and the stress concentration and eccentric load of the cutterhead were also decreased. ©, 2015, Xi'an Jiaotong University. All right reserved. Source

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