关键词: 高铁隧道, 飞机荷载, 动力响应, 疲劳寿命, 抗减振措施

Abstract: To investigate antivibration response of highspeed railway tunnel lining structure under the impact load of aircraft landing, a case study is conducted on the highspeed railway tunnel section with a speed of 350 km/h crossing underneath East 2nd Runway of Tianfu airport using numerical simulation method, and corresponding antivibration measures are proposed. The research results reveal the following: (1) The peak displacement of the lining of the highspeed railway tunnel is 1.2 mm during a single heavy landing of the B747-400 aircraft, the peak value of the additional first principal stress is 328 kPa and the that of the additional third principal stress is 417 kPa, which all appear at the tunnel crown. (2) Under the action of longterm aircraft heavy landing, the fatigue damage occurs at the lining crown first, followed by the sidewall, and the fatigue life is 88 years. It is suggested to improve it by raising the specification of selflining concrete or setting vibration reduction layer. (3) The method of improving the concrete specifications of lining structure is effective in reducing vibration. The method of using foam concrete damping layer needs a certain thickness. It is suggested that the thickness of the damping layer is 0.5 m and the elastic modulus is above 0.7 GPa, so that the design service life of the tunnel can be met.

Key words: highspeed railway tunnel, aircraft landing load, dynamic response, fatigue life, antivibration measures