竖向排列隧道的地震响应分析

Seismic Response Analysis in Vertically Arranged Tunnels

建立了均质竖向排列隧道模型,对模型输入koyna地震波,研究竖向排列隧道的动力力学响应特征。分析结果表明,地震对竖向排列隧道的影响非常明显,最大应力的出现时间与地震波加速度峰值时间一致,且最大主应力增幅不大,不会对隧道造成损害;地震对隧道的破坏主要体现在拉应力方面,地震情况下的拉应力已经超过了围岩的抗拉强度,抗拉设计是抗震设计的重点。这个研究有利于类似工程的抗震设计。

A homogeneous vertically arranged tunnel model was built. The author studied the mechanical response characters of the vertically arranged tunnel by inputting koyna seismic wave to the model. The analysis shows that the influence is very obvious; the occurrence time of maximum stress accords with the acceleration peak time of seismic wave; the amplitude of principal stress is not big enough to damage the tunnel. The destruction mainly lies in tensile stress which has surpassed the tensile strength of surrounding rocks under the seismic wave. Therefore, tensile resistance is the key to the seismic resistant design. The study is beneficial to the similar engineering.