花岗岩隧道动力响应特性影响因素

Influence factors of dynamic response characteristics of granite tunnel

为研究花岗岩隧道动力响应特性,以北门隧道工程地质资料为依托,建立数值分析模型,分析了围岩水平、埋深、地震波强度三个影响因素对隧道动力响应特性的影响.研究结果表明:随着围岩节理越来越发育,隧道关键点水平相对位移峰值均增大,围岩越破碎、节理越发育,隧道的位移响应越强烈,对隧道的稳定越不利;围岩的存在对隧道的加速度响应具有一定的限制作用,在一定埋深范围内,随着埋深增加,这种限制作用越大;深埋时隧道的存在不改变围岩的加速度响应,反而对围岩的加速度响应具有一定的依赖性和追随性;地震波强度对隧道的相对位移峰值影响较大,随着地震波强度的增大,隧道相对位移值逐渐增大.

In order to study the granite tunnel dynamic response characteristics, based on the north gate tunnel engineering geological data, this paper established a numerical analysis model, and analyzed the influences of three factors on the dynamic response of the tunnel, which are the level of the surrounding rock, the depth of the buried depth and the intensity of the seismic wave. Research results show that with the increasing development of surrounding rock joints, the peak value of the relative displacement of the key points of the tunnel increases, and the more the surrounding rock is broken, the more the joint is developed, and the stronger the displacement response of the tunnel, the more unfavorable the stability of the tunnel. The existence of the surrounding rock has a certain limit to the acceleration response of the tunnel. In a certain depth range, the greater the depth of the buried, the greater the effect of this restriction. The acceleration response of the surrounding rock is not changed, but the acceleration response of the surrounding rock is dependent on the acceleration response of the surrounding rock. The intensity of seismic wave has great influence on the relative displacement of the tunnel, and the relative displacement of the tunnel increases with the increase of the intensity of the earthquake wave.