Abstract In order to deal with the problems of dynamic response and fatigue damage of the lining structure of oper? ational high-speed railway tunnels under the impact load of aircraft landing, the finite element analysis method is employed to study the dynamic response and fatigue damage law of tunnels based on the tunnel on the ChengduZigong high-speed railway passing under the East Runway 2 of Tianfu International Airport. The results show that the maximum dynamic load appears at 0.05 s after rough landing of a Boeing 747-400, with the value of about 500kN; in a single rough landing condition, the tunnel vault would be subjected to maximum displacement and stress,and the maximum peak of displacement is 1.58 mm, the maximum peak of tensile stress is 437.79 kPa, the maximum peak of compressive stress is 556.24 kPa, with no plastic damage in the lining structure; under the long-term rough landing of airplanes, the parts and degree of structural damage increase with an increase in the number of cycles, the most serious damage condition occurs in the vault followed by side walls, and the fatigue life of the tunnel lining is about 25 a.
Abstract：
In order to deal with the problems of dynamic response and fatigue damage of the lining structure of oper? ational high-speed railway tunnels under the impact load of aircraft landing, the finite element analysis method is employed to study the dynamic response and fatigue damage law of tunnels based on the tunnel on the ChengduZigong high-speed railway passing under the East Runway 2 of Tianfu International Airport. The results show that the maximum dynamic load appears at 0.05 s after rough landing of a Boeing 747-400, with the value of about 500kN; in a single rough landing condition, the tunnel vault would be subjected to maximum displacement and stress,and the maximum peak of displacement is 1.58 mm, the maximum peak of tensile stress is 437.79 kPa, the maximum peak of compressive stress is 556.24 kPa, with no plastic damage in the lining structure; under the long-term rough landing of airplanes, the parts and degree of structural damage increase with an increase in the number of cycles, the most serious damage condition occurs in the vault followed by side walls, and the fatigue life of the tunnel lining is about 25 a.
IU Kai1 WU Zaixin2 YANG Jizhong3 GUAN Haoyu4,
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.Study of Dynamic Response and Fatigue Damage of High-speed Railway Tunnels under the Impact Load of Aircraft Landing[J] MODERN TUNNELLING TECHNOLOGY, 2022,V59(2): 96-102
2022, Vol. 59 