|
|
|
| Influence of circular road tunnel on ground motion in soft soil |
| YUAN Yong1,2, WANG Qi1
|
1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China;
2. State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China |
|
|
|
|
Abstract This paper studied the seismic response law of ground motion influenced by built road tunnel at specific site conditions in soft soil. The acceleration response of ground at surface from tunnel axis horizontally was investigated when buried depth of a round tunnel and input motion of base excitation vary, in the given site, by means of numerical method. Regularized amplitude and its Fourier spectrum of acceleration response were established as a scale of the influence index. The results showed that the regularized Fourier spectrum amplitude of acceleration varies periodically with input frequency and buried depth if uniform site were supposed. Whereas at practical layered site, the regularized acceleration Fourier spectrum amplitude gradually approached constant 1.0 if the distance between the observation point and the tunnel axis increased and either if buried depth increased. Especially, when the distance between the surface and the tunnel axis exceeded 2.5D or the buried depth exceeded 2.5D, the maximum amplification of Fourier spectrum amplitude of acceleration was less than 20%.
|
|
Received: 27 April 2023
Published: 20 September 2023
|
|
|
|
|
|
|
|
