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首页> 外文期刊>Tunnelling and underground space technology >Model test study on the dynamic response of the portal section of two parallel tunnels in a seismically active area
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Model test study on the dynamic response of the portal section of two parallel tunnels in a seismically active area

机译：地震活动区两条平行隧道洞口段动力响应模型试验研究

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摘要

A model test or the portals or two parallel tunnels is carried out to learn about the dynamic response or tunnel liner and the interaction between surrounding rock and liner in earthquakes. The experiment results show that: first, when the seismic acceleration traverses the model material, the low-frequency segment of seismic acceleration is magnified and the high-frequency segment of seismic acceleration is attenuated; second, the horizontal shear failure of the surrounding rock is caused by the interaction between the surrounding rock and the tunnel liner, and the cracks in the surrounding rock grow nearly in the same direction, however, because of the different constraints on the tunnel liner by the surrounding rock outside the tunnel, the destruction degree is different; third, the liner cracks of the left tunnel with short length appear mainly at the left tunnel entrance, the cracks of right tunnel with large length appear mainly at the right tunnel entrance and the tunnel cross-section nearly which is in the same vertical plane with the left tunnel portal, and the liner cracks are distributed mainly on the closer side of two liners between the two holes; finally, in the same vertical testing cross-section, the liner maximal strain at the inner sides between two tunnels is greater than outer sides. In addition, the cross-section maximal strain on the right tunnel decreases with the increasing distance between the tested cross-section and a reference vertical plane containing the left tunnel portal.
机译：进行了模型测试或门户或两个平行隧道，以了解地震中的动力响应或隧道衬砌以及围岩与衬砌之间的相互作用。实验结果表明：首先，当地震加速度穿过模型材料时，地震加速度的低频段被放大，地震加速度的高频段被衰减。其次，围岩的水平剪切破坏是由围岩与隧道衬砌之间的相互作用引起的，而围岩中的裂缝几乎在同一方向上生长，但是由于对隧道衬砌的约束不同隧道外围岩破坏程度不同。第三，短长度左隧道的衬砌裂缝主要出现在左隧道的入口，大长度的右隧道的裂缝主要出现在右隧道的入口，且隧道的横截面几乎与垂直平面相同。左隧道入口，衬砌裂缝主要分布在两个孔之间的两个衬砌的较近侧。最后，在相同的垂直测试横截面中，两个隧道之间内侧的衬砌最大应变大于外侧。另外，随着被测横截面与包含左隧道入口的参考垂直平面之间距离的增加，右隧道的横截面最大应变减小。

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