小半径平面曲线隧道地震响应分析

基于某实际工程,建立了小半径平面曲线隧道三维分析模型,探讨其在单向水平激振下的地震响应规律。其中考虑了隧道弯曲角度、地震动幅值和类型等因素的影响。通过分析得出了小半径平面曲线隧道的地震响应规律:①响应幅值方面,横向抗震段的响应最大,曲线段其次,纵向抗震段最小;②响应差异方面,曲线部分对隧道加速度影响较小,主要影响隧道的变形;③震动能量方面,随着隧道从横向抗震逐渐过渡到纵向抗震,其震动能量逐渐降低。

Seismic response of small-radius planar curved tunnels

A three-dimensional model for small-radius planar curved tunnels with different bending angles is established to investigate their seismic response. The influences of bending angle, amplitude and type of ground motion are considered. The seismic response laws of the small-radius planar curved tunnels are obtained: (1) For the response amplitude, the transverse seismic section is the largest, the curve section is the second, and the longitudinal seismic section is the least. (2) For the response difference, the curve part has little effect on tunnel acceleration, which mainly affects the deformation of tunnel; (3) For the vibration energy, the energy decreases gradually with the transition from transverse seismic section to longitudinal one.