Abstract: In order to clarify the vibration coupling laws of TBM main body under different working conditions, the nodes of TBM main body are divided according to their relationships with structural assembly and force transfer based on ADAMS. By introducing nonlinear springs, the nonlinear equivalent is carried out on oil cylinder, bearing and gear mesh, the nonlinear coupling dynamic model of TBM main body is established, and the stiffness of the structure and the nonlinear connection stiffness between the structures are calculated in detail. Three typical cutterhead loads, i.e. full thrust, uppersoft and lowerhard and turning, are defined according to geological conditions, and the vibrations under the three loads are analyzed. The results show that: (1) Under full thrust condition, the vibration of the key components of the main body is the largest, which is the lowfrequency forced vibration; the vibration of the head frame is coupled by the gears horizontally and longitudinally, and the coupling vibration exists at a frequency of about 150 Hz. (2) The maximum axial acceleration of cutterhead reaches 2.5g, the vibration of head frame is reduced by about 25% from cutterhead to main beam, and the vibration of the front section of main beam is reduced by about 55%, which is close to the actual measured results under the existing full thrust condition and verifies the feasibility of the simulated calculation. (3) According to the analytical results of the vibration laws under the two typical working conditions, i.e. uppersoft and lowerhard and turning, the axial acceleration of the cutterhead decreases by about 40% and 80% respectively.

Key words: fullface TBM main body, ADAMS, nonlinear multibody dynamics, coupled vibration, timefrequency analysis