Abstract At present, the seismic coefficient method is often adopted in the aseismic design of most shield tunnels in China. In this paper, the response displacement method is introduced to calculate the increments of internal force in a lining under seismic loading, while the internal force in a lining under normal conditions is calculated by taking into account the crown pressure and the pore water pressure. Then, by means of the superposition of the above two kind of forces, the total internal force in the lining under seismic loading is obtained, and the aseismic design of a shield tunnel is conducted based on all these factors. Compared with the calculation results of the finite element method and the seismic coefficient method, it shows that the response displacement method can be applied to the lining strength calculations for the aseismic design of shield tunnels and the major positive internal force and negative internal force would emerge every 30° starting from the vertical axis under seismic loading, which requires special consideration in the aseismic design of a tunnel cross section.
Abstract：
At present, the seismic coefficient method is often adopted in the aseismic design of most shield tunnels in China. In this paper, the response displacement method is introduced to calculate the increments of internal force in a lining under seismic loading, while the internal force in a lining under normal conditions is calculated by taking into account the crown pressure and the pore water pressure. Then, by means of the superposition of the above two kind of forces, the total internal force in the lining under seismic loading is obtained, and the aseismic design of a shield tunnel is conducted based on all these factors. Compared with the calculation results of the finite element method and the seismic coefficient method, it shows that the response displacement method can be applied to the lining strength calculations for the aseismic design of shield tunnels and the major positive internal force and negative internal force would emerge every 30° starting from the vertical axis under seismic loading, which requires special consideration in the aseismic design of a tunnel cross section.
2013, Vol. 50 