隧道穿过土层分界面振动台模型试验研究

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摘要为了研究穿过不同土层的隧道在地震作用下的反应，进行隧道穿过土层分界面的振动台模型试验。采用自主研制的层叠剪切箱减小边界效应，装填黏土和砂土构成横向非均匀场地，模型隧道的轴线垂直穿过2种土的竖直分界面。通过输入不同幅值的El-Centro波，采集土层和隧道不同观测点处的加速度和应变等数据并进行分析，研究了在不同性质土层中地震波传播的规律以及隧道地震响应的特点，分析土层分界面对于隧道地震响应的影响。试验结果表明，地下结构的变形主要由周围土体的相对位移控制；砂土和黏土动力特性以及对隧道约束作用的差异会导致分界面两侧的隧道地震响应不同，产生相对位移，令隧道产生转动、弯曲和扭剪。

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关键词 ：隧道工程, 振动台模型试验, 地震响应, 土体性质, El-Centro波

Abstract：In order to study the seismic responses of tunnel through different soil layers in the earthquake，the shaking table model test was carried out. Shear box developed independently was used to reduce the boundary effect；lateral non-uniform site was made up by clay and sand；the axis of tunnel was vertically through the interface. After El-Centro seismic waves of different amplitudes were input from the base，acceleration and strain data were collected and analyzed. The features of seismic wave propagation in different soil layers were studied and the influences of soil interface on seismic responses of tunnel were analyzed. Results demonstrate that the deformation of tunnel is mainly controlled by relative displacement of the soil around it. Moreover，the differences between clay and sand in dynamic characteristics and restraints to tunnel will cause different responses of tunnel on both sides of the interface，and then the relative displacement will lead to spin，bend and twist-shear of tunnel.

Key words： tunneling engineering shaking table model test seismic response soil property El-Centro wave

收稿日期: 2012-11-16

引用本文:

邹炎，景立平，李永强. 隧道穿过土层分界面振动台模型试验研究[J]. 岩石力学与工程学报, 2014, 33(sl): 3340-3348.
ZOU Yan，JING Liping，LI Yongqiang. STUDY OF SHAKING TABLE MODEL TEST OF TUNNEL THROUGH SOIL INTERFACE. , 2014, 33(sl): 3340-3348.

链接本文:

http://www.rockmech.org/CN/Y2014/V33/Isl/3340

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