小净间距正交上跨隧道加速度响应振动台试验研究

随着国家路网建设规模的不断扩大,大量铁路隧道或公路隧道出现了近接平行、交叉现象,并且隧道之间的近接交叉净间距不断减小,由此产生的工程问题逐渐变得复杂。文章以立体交叉草莓沟2#隧道和盘道岭隧道为例,将草莓沟2#隧道(下穿隧道)作为研究对象,完成了地震动为0.1g、0.15g、0.2g、0.3g、0.4g、0.6g、0.8g、1.0g八种地震情形8种加载工况下的振动台试验,重点分析受上穿隧道的影响下,小净间距小角度立体交叉下穿隧道拱顶、仰拱断面的加速峰值相应特征以及动力时程曲线,研究成果将对近接隧道设计与施工起到良好的经验借鉴。

With the continuous expansion of national road network construction scale,a large number of railway tunnels or highway tunnels tend to nearly parallel and cross,and the net distance of the close cross between the tunnels is decreasing,thus resulting in more complexengineering problems.Taking Caomeigou Tunnel#2 and Pandaoling Tunnel as examples,this paper takes strawberry gouge tunnel(under-crossing tunnel)as the research object.The shaking table tests under eight loading conditions with ground motions of 0.1g,0.15g,0.2g,0.3g,0.4g,0.6g,0.8g and 1.0g were completed,with emphasis on the corresponding characteristics of acceleration peak value and dynamic time history curve of tunnel vault and inverted arch section with small clear spacing and small angle interchange influenced by above-crossing tunnel.The research results can provide good experience reference for near tunnel design and construction.