盾构隧道联络横通道地震响应振动台试验

发布时间：2018-07-24 20:30

【摘要】：为探讨盾构隧道与联络横通道采用不同连接方式时的地震响应特性,基于考虑横向弯曲刚度有效率的等效刚度模型,采用4~28Hz的正弦拍波作为输入地震波,开展了几何相似比为1∶40的振动台模型试验,模型制作中将盾构隧道与联络横通道分别浇筑后采用不同刚度的材料进行粘接,以模拟盾构隧道与联络横通道的刚性连接方式和柔性连接方式,同时研究了地层和结构的加速度响应规律以及结构关键位置处的应变频谱特性。研究结果表明:地震动沿隧道横断面方向输入时,地层在竖直方向上加速度放大倍率随高度增加而增大;盾构隧道与横通道连接位置拱顶处的环向应变远小于纵向应变;盾构隧道与横通道连接位置拱脚处的主应变响应峰值最大;刚性连接下联络横通道对盾构隧道衬砌应变影响区域在3倍横通道横断面宽度范围左右;柔性连接可有效减小盾构隧道和联络横通道结构上各点的应变峰值,但不会改变其频谱特性;柔性连接可使联络横通道对盾构隧道衬砌应变影响范围减小至2倍横通道横断面宽度左右。
[Abstract]:In order to discuss the seismic response characteristics of the shield tunnel and the contact cross channel with different connection modes, based on the equivalent stiffness model considering the efficiency of the lateral bending stiffness, the sinusoidal wave of 4~28Hz is used as the input seismic wave, and the shaking table model test of the geometric similarity ratio of 1: 40 is carried out. The shield tunnel and the contact transverse section are made in the model. In order to simulate the rigid connection mode and the flexible connection mode of the shield tunnel and the contact cross channel, the acceleration response law of the stratum and the structure and the strain spectrum characteristics at the key position of the structure are studied. The results show that the seismic moving along the cross section direction of the tunnel. At the input, the acceleration magnification increases with the height in the vertical direction; the circumferential strain at the vault of the shield tunnel and the transverse passage is far less than the longitudinal strain; the maximum response peak of the main strain response at the arch foot of the shield tunnel and the transverse passage is the maximum, and the strain shadow of the shield tunnel lining under the rigid connection is connected with the cross channel. The ringing area is about 3 times the transverse section width of the cross section, and the flexible connection can effectively reduce the strain peak of each point in the shield tunnel and the cross channel structure, but it will not change its spectrum characteristics. The flexible connection can reduce the impact range of the shield tunnel lining strain to about 2 times the transverse section width.
【作者单位】：西南交通大学交通隧道工程教育部重点实验室;厦门市轨道交通集团有限公司;
【基金】：国家重点研发计划项目(2016YFC082202) 国家自然科学基金-煤炭联合基金重点项目(U1361210);国家自然科学基金项目(51578457,51378433) 厦门市科技计划重大项目(3502Z20151006)
【分类号】：U455.43

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