基于振动台模型试验的特大断面隧道地震动态响应研究

发布时间：2018-04-17 17:00

本文选题：特大断面隧道 + 地震动响应　；参考：《工程地质学报》2017年03期

【摘要】：以福州市二环路金鸡山隧道扩建工程为背景,设计制作了特大断面隧道的1/30缩尺模型,完成了21种工况下的模拟地震动试验,重点关注隧道模型加速度与接触压力的地震响应。将响应加速度峰值与输入地震波加速度峰值的比值,定义为PGA放大系数。各测点的PGA放大系数随着高程增加呈负指数型增大,其场地高程效应的表现形式与一般场地明显不同;随着地震动幅值的增大,各测点PGA放大系数逐渐减小,且不同频率特征地震波激励对高程效应形态的影响已不明显。将响应接触压力峰值与静止接触压力的比值,定义为PEP震荡系数。随着地震动幅值的增大,拱顶与拱底处的PEP震荡系数则始终保持在较小范围内,而拱脚与拱肩处的PEP震荡系数均呈近似线性增大趋势,这为隧道抗震设计中,衬砌-地层接触压力的参数取值提供了定量参考。
[Abstract]:Based on the expansion project of Jinjishan Tunnel on the second Ring Road of Fuzhou City, the 1 / 30 scale model of the tunnel with large cross-section is designed and made. The simulated ground motion tests under 21 conditions are completed, and the earthquake response of the tunnel model acceleration and contact pressure is focused on.The ratio of response acceleration peak to input seismic wave acceleration peak is defined as PGA magnification factor.The PGA magnification coefficient of each measuring point increases in negative exponential form with the increase of height, and the expression form of site height effect is obviously different from that of general site, and the PGA magnification factor of each measuring point decreases gradually with the increase of the amplitude of ground motion.The effect of seismic wave excitation on height effect is not obvious.The ratio of the peak value of the response contact pressure to the static contact pressure is defined as the PEP oscillation coefficient.With the increase of the amplitude of ground motion, the PEP oscillation coefficient of arch roof and arch bottom is always kept in a small range, while the PEP oscillation coefficient at arch foot and arch shoulder is approximately linearly increasing, which is the case in tunnel seismic design.The parameters of lining-formation contact pressure provide a quantitative reference.
【作者单位】：福州大学土木工程学院;福州市规划设计研究院;西南交通大学土木工程学院;
【基金】：国家自然科学基金(51378433,51678155)资助
【分类号】：U452.28

【相似文献】