To investigate antivibration response of highspeed railway tunnel lining structure under the impact load of
aircraft landing, a case study is conducted on the highspeed railway tunnel section with a speed of 350 km/h crossing
underneath East 2nd Runway of Tianfu airport using numerical simulation method,
and corresponding antivibration measures are proposed.
The research results reveal the following: (1) The peak displacement of the
lining of the highspeed 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 longterm 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 selflining 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.
LIU Kai, WU Zaixin, YANG Jizhong, OU Xiaoqiang, GUAN Haoyu
. Fatigue Life and AntiVibration
Measures of HighSpeed Railway Tunnel under Aircraft Landing Impact Load[J]. Tunnel Construction, 2022
, 42(S1)
: 281
-288
.
DOI: 10.3973/j.issn.2096-4498.2022.S1.033
