多向地震作用下软弱围岩桥隧搭接段动力响应试验

Experimental study on seismic dynamic response of bridge-tunnel lap under multi-direction seismic loads

为探明多向地震作用下软弱围岩高速公路桥隧搭接段的地震动力响应特性,开展尺寸比例为1:50的振动台模型试验,以汶川波作为试验加载地震波,在不同加载方式下,测试桥隧搭接段各测点加速度放大系数值,分析其纵向、横向和竖向的加速度响应特征,并明确不同方向的地震波对桥隧搭接段结构的影响。结果表明:横向地震波引起的加速度响应普遍大于竖向地震波;纵向和横向双向耦合方式下加速度响应普遍大于其他耦合方式的加速度响应;双向地震耦合引起的纵向和横向加速度响应均大于单一方向的加速度响应。

In order to explore the seismic dynamic response characteristics of weak rock at bridge-tunnel lap under multi-directional seismic loads, Wenchuan wave was taken as the test 1 shaking oading table model tests with a scale of 1 :50were carried out. seismic wave,the acceleration amplification coefficient values of each measuring point in the link of bridge and tunnel under different loading modes were tested, and the characteristics of the vertical,horizontal and vertical acceleration responses of the link were analyzed,so as to clarify the influences of seismic waves in different directions on the structure of the link. The results show that the acceleration produced by transverse seismic waves is larger than the acceleration produced by vertical seismic waves,that the acceleration responses of longitudinal and lateral two-way coupling earthquakes are generally greater than those of other coupling modes,and that the longitudinal and lateral acceleration responses induced by two-way seismic coupling are greater than those by single earthquakes.