Abstract：In order to study the effects of dome voids on the tunnel lining and the surrounding soil，both model test and numerical simulation were performed in this study. Taking the acceleration response peak and the frequency response function as the evaluation indexes，the dynamic response characteristics of the tunnel lining and the surrounding soil under single-point vibration loading were analysed for both cases with and without voids. Furthermore，the dynamic responses of the tunnel lining and the surrounding soil under moving train loads were examined by numerical simulation. The results show that the existence of the voids could increase the acceleration response of the tunnel structure and the surrounding soil. By calculating the frequency domain，it is found that the influence of the voids on the tunnel structure is mainly in the frequency domain above 90 Hz，and the maximum difference of the dynamic response of both cases could reach 10 dB. At the ranges of 0–90 and 150–190 Hz，the voids have little influence on the dynamic response of the surrounding soil，while at the ranges of 90–150 and above 190 Hz the voids will significantly increase the dynamic response of the soil. The influence of the dome voids on the dynamic response of the tunnel structure and the surrounding soil under the moving load is similar to that under the single point load. The dynamic responses of the vault and invert of the tunnel and the soil above the tunnel increase under moving loads. The influence of the dome voids on the internal force of the segment is small and limited to the near field. The axial force of the segment fluctuates at the position of the voids and is larger than that without voids.
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2019, Vol. 38 
