Abstract: In view of the impact of strong vibration on the internal flow channels in hydraulic valve blocks during the tunneling process of tunnel boring machines ( TBM) ,the flow field simulation models of three typical flow channels of U-shape,Z-shape,V-shape under foundation vibration are constructed,and they are validated by experiments.Then,the influences of the vibration direction and intensity on the pressure drop characteristics of the typical flow channels are analyzed by simulations.The results indicate that the pressure drop of the flow channels in the hydraulic valve blocks under the foundation vibration fluctuates periodically with time,the fluctuation amplitude and mean value of the pressure drop increase with the amplification of the vibration intensity,and that,when the flow channels are placed in the hydraulic valve blocks,the vibration in the Y direction should be avoided in the Ushaped flow channel,the vibration in the X direction should be avoided in the Z-shaped flow channel,and the vibration in the Z direction should be avoided in the V-shaped flow channel.The conclusions can provide a theoretical basis for the structural design of hydraulic valve blocks under foundation vibration.

Key words: tunnel boring machine, valve channel, vibration direction, vibration intensity, pressure drop characteristic