隧道穿过土层分界面振动台模型试验研究

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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

Received: 16 November 2012

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https://rockmech.whrsm.ac.cn/EN/Y2014/V33/Isl/3340

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