Abstract: Study the influence of thrust and torque in shield tunneling cutter head with oscillatory excavation. Because of the change of contact state between cutting tools with the soil body and of the instability of soil structure under the active vibration,the resistance has been reduced during shield tunneling excavation. In the numerical model, the Drucker-Prager failure criterion is adopted. The finite element dynamic model of cutter-head digging is established by LS-DYNA software. Analyzed the curve of thrust and torque during the cutter-head excavated simulation under vibration acted respectively on the forward and rotation direction. The results show that when the active vibration is applied in the direction of rotation, the cutting resistance decreases with the increase of amplitude, and the energy consumption increases with the increase of amplitude. In the 16 sets of orthogonal tests, thrust, torque and energy consumption are all reduced. One cosine vibration in 21.2×10^-3 rad amplitude and 15 Hz frequency applied to the rotation direction can reduce the propulsion resistance by 24.4% and torque by 22.3%. But energy consumption increase by 4.3%. When 0.254 mm amplitude 10 Hz frequency applied in advanced direction and 6.36×10^-3 rad amplitude 20 Hz frequency applied in rotation direction,the propulsion resistance reduced by 1.3%.And the torque reduced by 6.5%. Energy consumption reduced by 1.5%.

Key words: cutter head, dynamic modeling, LS-DYNA, numerical simulation, oscillatory excavation