VIBRATION RESPONSE TRANSMISSION OF LINING ARCH DUE TO TRAIN SPEED-CHANGING VIBRATION LOAD

Through the field tests, the study finds that the vibration of a lining arch under train load grows up with the increasing of train speed, and that the lateral and vertical vibrations of the arch show different transfer laws. A finite element model was established based on ABAQUS, and the vibration response of a tunnel lining arch under train loads at different speeds was analyzed by an implicit method. The study results show that:the calculation results of finite element agree well with the measured values, which could be used as a supplement and forecast of the actual measurement data; and the vibration response of tunnel grow up with the increasing of train speed; the accelerations of the vibration response of lining caused by different speeds are consistent; and the vertical vibrations of the lining caused by different train speeds are smaller in the vault, whose change is not obvious with the increasing of the train speed; and the lateral vibration of the lining arch increases obviously with the increasing of the train speed, but the different speed caused by transverse vibration in the horizontal position of the center of lining tunnel (at 0° and 180°) with the train speed did not change significantly, and the vibration amplitude is lower; the empirical formula is fitted for the lateral and vertical vibration accelerations of the tunnel lining caused by different speed trains.