大尺度可液化场地综合管廊纵向抗震分析方法

Longitudinal seismic analysis method of utility tunnel in large-scale liquefiable site

为解决穿越可液化复杂场地的长大地下结构纵向抗震分析问题,采用有效应力方法,针对预制管廊连接结构提出了一种改进的广义反应位移法.通过建立精细化三维实体模型,验证了该方法的有效性.在管廊地震响应薄弱位置设置记忆合金消能减震节点,研究管廊纵向抗震性能.结果表明:较三维时程分析法,改进的广义反应位移法计算结果偏于保守;有效应力法计算的管节张开量在液化区明显增大,而非液化区管节地震响应变化较小;设置消能减震节点位置管节张开量放大,而其他区域的张开量明显减弱,有效提高了管廊的抗震性能.研究内容可为长大地下结构的抗震分析及评估提供参考.

In order to solve the longitudinal seismic analysis of long underground structures crossing liquefied complex sites, an improved generalized response displacement method was proposed for the prefabricated pipe gallery connection structure by using the effective stress method.The effectiveness of this method was verified by establishing a refined three-dimensional solid model.The longitudinal seismic performance of the utility tunnel was studied by setting memory alloy energy dissipation and damping joints at the locations where the seismic response of the utility tunnel is vulnerable. The results show that the improved generalized response displacement method is more reliable than the three-dimensional time history analysis method.The opening of tunnel joint calculated by effective stress method increases obviously in liquefaction area, but the seismic response of tunnel joint in nonliquefaction area changes minor. The opening of the tunnel joint at the location of the energy dissipation node is enlarged, while the opening in other areas is obviously attenuated, which effectively improves the seismic performance of the utility tunnel. The research contents can provide reference for seismic analysis and evaluation of long underground structures.