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SEISMIC DYNAMIC RESPONSE ANALYSIS OF TWIN TUNNELS WITH DIFFERENT LINING STIFFNESS IN MOUNTAINS
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摘要: 为研究不同衬砌刚度下的山岭双洞隧道地震响应情况，采用波动理论结合数值计算的方法，以雅泸高速公路勒不果喇吉隧道为背景，计算并分析不同衬砌刚度下双洞隧道的地震响应。采用波动散射理论分析P波作用下双洞圆形隧道衬砌的动应力系数级数解，波动分析结果表明：双洞圆形隧道衬砌的动应力系数与双洞隧道的间距、衬砌刚度以及P波频率均有重要关系。双洞隧道间距越小，衬砌刚度越大，圆形隧道衬砌动应力系数越大；平面入射P波频率越高，双洞圆形隧道衬砌动应力系数越小。基于FLAC3D分析软件建立了山岭双洞隧道地震响应三维数值分析模型，计算结果表明：刚性衬砌下隧道结构的地震响应明显高于柔性衬砌，说明柔性衬砌可以减弱隧道的地震动力响应，具有一定的减震作用，但柔性衬砌的地震响应位移高于刚性衬砌。数值分析结果与波动理论分析相吻合。Abstract: To study seismic responses of twin tunnels with different lining stiffness, the seismic responses of twin tunnels with different lining stiffness was calculated and analyzed by the wave theory and combined with numerical calculation methods, taking the Leboguolaji tunnel of the Yalu Expressway as the background. The wave scattering theory was used to analyze the series solutions of dynamic stress coefficients for circular linings under the action of plane P-wave. The wave analysis results showed that the dynamic stress coefficient of circular linings for twin tunnels had important relation with the distance between twin tunnels, lining stiffness and P-wave frequency. The smaller the distance between the twin tunnels and the larger the lining stiffness, the larger the dynamic stress coefficient of the twin tunnels linings.The higher the plane P-wave frequency, the smaller the dynamic stress coefficient of the twin tunnel linings. Based on FLAC3D analysis software, the analysis model of numerical seismic responses for twin tunnels in mountains was constructed. The calculation results showed that the seismic responses of the tunnel structure with the rigid lining was significantly higher than that of the flexible lining, which indicated that the flexible lining could weaken the seismic dynamic responses of tunnels and had a certain shock absorption effect, but the seismic displacement of the flexible lining was higher than that of the rigid lining. The numerical results were in good agreements with the wave theory.
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Key words:
- lining stiffness /
- twin tunnels /
- seismic response
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