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基于动力模型相似理论,设计了一个尺寸为1∶10的偏压隧道模型进行大型振动台试验,研究模型分别在大瑞人工波、Kobe波和汶川波水平竖向双向激振条件下偏压隧道的加速度、动应变和围岩压力的动力响应特性。试验结果表明:偏压隧道竖向加速度响应与地震波、振幅和测点位置有关,且对激振加速度有放大效应,但随输入加速度峰值的增大而减小,受临空坡面放大效应的影响,同一高程靠近坡面的偏压侧放大系数大于非偏压侧(除拱脚外);水平向加速度响应主要与测点位置关系较大,受波形和振幅影响较小。衬砌在地震作用下主要承受拉应力,主应力随输入加速度峰值的增大而增大,非偏压拱脚主应变值最大是抗震设防的关键部位。
Based on the similarity theory of dynamic model, a bias tunnel model with a size of 1:10 was designed for large-scale shaking table test. The model was biased under the conditions of DAR, Kobe and Wenchuan waves Acceleration, dynamic strain and dynamic response of surrounding rock. The experimental results show that the vertical acceleration response of the biased tunnel is related to the location of seismic wave, amplitude and measuring point, and it has amplifying effect on the acceleration of acceleration but decreases with the increase of input acceleration. , The magnification factor at the bias side of the same height near the slope is larger than that at the unbiased side (except for the arch). The horizontal acceleration response mainly depends on the position of the measuring point and is less affected by the waveform and amplitude. The lining is mainly subjected to the tensile stress under the action of earthquake, and the principal stress increases with the increase of the input acceleration. The maximum principal strain of unbiased arch arches is the key part of seismic fortification.