浅埋偏压连拱隧道地震加速度响应特性研究

Study on seismic acceleration response characteristics of shallow buried biased multi-arch tunnel

为了得到浅埋偏压连拱隧道加速度动力响应特性,在MIDAS-GTS/NX软件中建立了隧道三维有限元模型,并进行非线性时程分析。研究结果表明:(1)衬砌拱脚处的加速度放大系数较大,在衬砌仰拱与拱顶处相对较小;(2)加载峰值仅能改变测点的响应峰值,不改变加速度响应的变化规律;(3)处在中隔墙的测点的加速度响应比其他相对应的测点响应要强烈;(4)测点加速度响应规律在不同加载方向上有很大的区别。得到结论可以为该类型隧道的抗震设计提供一定参考。

In order to obtain the acceleration dynamic response characteristics of shallow-buried biased multi-arch tunnel,a three-dimensional finite element model of the tunnel is established in MIDAS-GTS/NX software,and the non-linear time history analysis is carried out.The results show that:(1) the acceleration amplification factor at the foot of the lining arch is larger than that at the inverted arch and vault of the lining arch;(2) The peak load can only change the peak response of the measured point,but does not change the law of acceleration response;(3) The acceleration response of the measuring point in the middle partition wall is stronger than that of other corresponding measuring points;(4) The acceleration response law of the measuring point varies greatly in different loading directions.The conclusions can provide some reference for the seismic design of this type of tunnel.