【摘要】 以雅安—泸沽高速公路高烈度地震区山岭隧道为依托工程,对山岭隧道洞口段结构动力响应进行大型振动台模型试验研究,得出如下结论:隧道结构的最大地震动响应出现位置及其破坏形态与5.12汶川大地震中隧道工程的破坏情况基本一致;隧道设置减震层后,衬砌裂缝数量明显减少,能够改善隧道结构的整体受力状态;在试验中隧道结构均出现一定数量的环向裂缝和斜向裂缝,大部分纵向或斜向裂缝延伸至环向裂缝后终止发展。建议在隧道洞口段设置一定数量的减震缝,吸收地震时能量,减小对结构的破坏。研究成果对高烈度地震区山岭隧道抗减震设计与施工具有一定的参考价值。更多还原

【Abstract】 Based on the mountain tunnel along Yaan—Lugu highway in strong earthquake area,the dynamic response of mountain tunnel has been analyzed by the means of a large-scale shaking table test.The position of the largest dynamic response of the tunnel and its damage modes are basically the same with that of tunnels damaged in Wenchuan earthquake.The stress state of the tunnel is evidently optimized because of the designed shock absorption layer.There are a lot of longitudinal and oblique cracks on the surface of the tunnel portal,and these cracks extend to the ring cracks and do not propagate.Some shock absorption seams should be designed at the tunnel portal part in order to absorb the earthquake wave energy and protect tunnel structure.These results have a certain reference value for aseismic design and construction of mountain tunnels in strong earthquake area.更多还原