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浅埋偏压小净距隧道具有与其它形式隧道不同的受力特点,其地震响应特性也必然不同于其它隧道。基于相似理论设计并完成了浅埋偏压小净距隧道大型振动台模型实验,研究了小净距隧道分别在X(水平)向、Z(竖直)向、XZ双向(水平竖直同时输入)多种工况汶川地震波作用下隧道衬砌加速度和动应变响应规律。实验结果表明:(1)衬砌加速度受地震波的入射方向影响较大,且Z向的影响大于X向,XZ双向的影响大于单向,左洞隧道的加速度响应大于右洞隧道;(2)衬砌应变受地震烈度的影响较大,隧道衬砌在地震作用下承受拉压循环荷载,以受拉为主,右洞隧道衬砌的动应变响应大于左洞隧道;(3)综合衬砌加速度与动应变的响应分析,左洞隧道的左半部分和右洞隧道的拱脚是隧道衬砌在地震作用下容易发生损坏的部位,在进行设计配筋时应特别注意。对于浅埋偏压小净距隧道衬砌进行抗震设计计算时,应考虑Z向地震的影响。研究成果可为浅埋偏压小净距隧道工程的抗震设计提供参考。
Shallow-buried biased narrow-gap tunnels have different stress characteristics than other forms of tunnels and their seismic response characteristics are necessarily different from those of other tunnels. Based on the similarity theory, a large-scale shale-shaking table model experiment of shallow buried shallow tunnel was designed and completed. The effects of small clear-distance tunnel on X (horizontal), Z (vertical) Response of Acceleration and Dynamic Stress of Tunnel Lining under Various Working Conditions by Wenchuan Earthquake. The experimental results show that: (1) the lining acceleration is greatly affected by the incident direction of the seismic wave, and the influence of the Z direction is greater than that of the X direction. The influence of the XZ bidirectional direction is greater than that of the unidirectional direction and the acceleration of the left tunnel is greater than that of the right tunnel. The strain is greatly affected by the earthquake intensity. The tunnel lining is subject to tensile and compression cyclic loads under tension and tension. The dynamic strain response of the right tunnel lining is greater than that of the left tunnel. (3) The comprehensive lining acceleration and dynamic strain In response analysis, the left half of the left tunnel and the arch of the right tunnel are the sites where the tunnel lining is easily damaged under the earthquake. Special attention should be paid when designing the reinforcement. For seismic design and calculation of shallow buried shallow tunnel lining, the influence of Z earthquake should be considered. The research results can provide a reference for the seismic design of shallowly-buried shallowly-spaced tunnels.