Abstract
Dynamic load is an important factor affecting the safety and stability of subway tunnel structures. To obtain the variation law of shield tunnel structure dynamic response under aircraft taxiing load, a three-dimensional numerical simulation of such tunnel under the action of aircraft taxiing load is performed on the basis of a project involving a shield tunnel orthogonal underpass taxiway. The effects of sliding speed and tunnel depth on the structure of the shield tunnel are also analyzed. The results show that the transverse displacement and acceleration response of tunnel segment exhibit evident time-space effect under the action of aircraft taxiing load. The transverse displacement and arch waist acceleration of the shield segment increase first and then decrease. The transverse displacement of the arch waist reaches its maximum when the aircraft taxis directly above the tunnel. The sliding speed exhibits an evident influence on the dynamic response of shield tunnel structure. The vertical and convergence displacements of tunnel segments increase with the increase in sliding speed. The dynamic response of tunnel structure is significantly affected by the factors of tunnel buried depth. The vertical and convergence displacements of tunnel segments decrease with the increase in tunnel buried depth. Therefore, the safety of the shield tunnel structure can be ensured by controlling the taxiing speed when the aircraft taxis directly above the tunnel. The measures of increasing the buried depth of the tunnel or strengthening the tunnel structure need to be considered when the taxiing speed is large.
Highlights
Subway construction has effectively solved the problem of urban traffic congestion and has become the main way to effectively improve the function of the airport comprehensive transportation hubs
Given that aircraft load is a dynamic load that has a significant effect on the safety of shield tunnel structure, the structural dynamic response of a shield tunnel under aircraft taxiing load must be studied [1, 2]
A number of undercrossing projects in aircraft movement areas have been successfully implemented in China and abroad; these projects include the Taipei Songshan Airport municipal road undercrossing project in an operating runway [3, 4], the Shanghai Rail Transit Line 10 undercrossing project in Hongqiao Airport’s runway [5], the Beijing Capital
Summary
Subway construction has effectively solved the problem of urban traffic congestion and has become the main way to effectively improve the function of the airport comprehensive transportation hubs. Shock and Vibration control formula in which shield construction causes no an antislope problem in the tunnel structure when crossing the runway of an aircraft movement area. Zhang et al [13] used three-dimensional (3D) finite element numerical simulation to obtain the runway subsidence law caused by an underpassing in a two-line shield tunnel. The numerical simulation method is used to study the variation law of taxiing speed on the dynamic response of tunnel segments and analyze the dynamic response of tunnel segments under different buried depths. E deformation law of the existing tunnel under aircraft taxiing load is obtained, and the acquired findings are important to the design, construction, and operation of subway tunnels and provide reference for similar projects The numerical simulation method is used to study the variation law of taxiing speed on the dynamic response of tunnel segments and analyze the dynamic response of tunnel segments under different buried depths. e deformation law of the existing tunnel under aircraft taxiing load is obtained, and the acquired findings are important to the design, construction, and operation of subway tunnels and provide reference for similar projects
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