大型引水隧道在平面地震波入射下动力响应的解析解

Analytic solution for seismic responses of large-span diversion tunnel induced by plane seismic waves

本文以波函数展开法为基础,给出了SV波与P波入射时大型引水隧道平面地震响应的解析解。并根据解析解,利用数值方法对建立的场地模型进行了计算分析,研究了隧道结构-水体体系的地震响应。重点讨论了入射波频率、入射角、衬砌力学性能对衬砌结构动力响应的影响。分析表明,大型引水隧道动力响应受入射波频率和入射角的影响较为明显,而衬砌力学性能则对隧道的动力响应影响不大。

This paper studies the seismic responses of large-span diversion tunnel filled with water induced by plane waves.The Fourier-Bessel series expansion method is used to solve the problem.The complicated ground model is analyzed.Tunnel structure-water system＇s seismic responses are studied on the basis of the analytical solution.The influence of the incident wave frequency,the incident angle and the elastic modulus of lining concrete on the seismic response of tunnel lining is studied.The analytical results indicate that the incident wave frequency and the incident angle have obvious influence on the seismic response of the diversion tunnel filled with water,while the elastic modulus of lining concrete has only a slight influence on the tunnel＇s dynamic responses.