Abstract:

The characteristics of dynamic cumulative damage of lining structure of highspeed railway tunnel under the longterm vibration load of train and the dynamic similar material model test for concrete structure should be well known. A fullface tunnel test model for the dynamic interaction between Jinshazhou Tunnel on WuhanGuangzhou Highspeed Railway and surrounding rocks is established by using microconcrete as similar material; and then the vibration load of highspeed train is brought to bear on the model to carry out dynamic cumulative damage test; meanwhile, the characteristics of dynamic response and the cumulative damage law of tunnel lining structure are analyzed by collected data of dynamic strain of tunnel lining structure, velocity of ultrasonic and contact stress of surrounding rock under tunnel during test. The results show that under the longterm action of vibration load of highspeed train, the dynamic cumulative damage of tunnel lining structure is not obvious while that of surrounding rock under tunnel is obvious. 

Key words: WuhanGuangzhou Highspeed Railway, Jinshazhou Tunnel, microconcrete, fullface tunnel model, dynamic cumulative damage