强震作用下岩石场地群洞地铁车站试验研究
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TU443

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Experimental Study of a Tunnel-Group Metro Station in Rock Site under Strong Earthquakes
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1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 2. China Railway Liuyuan Group Co., Ltd., Tianjin 300308, China; 3. State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China

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    摘要:

    摘要:为探究岩石场地群洞地铁车站在地震作用下的动力特性,设计了一个比尺1:30的群洞地铁车站结构的大型振动台试验模型,采用横向输入峰值加速度0.07 g、0.15 g、0.21 g、0.30 g、0.50 g、0.70 g和1.0 g等7个不同强度的人工地震波,研究了群洞地铁车站在强震作用下的加速度响应特征、位移响应特征、结构破坏模式和动应变响应特征。结果表明:阿里亚斯强度(Arias Intensity)的放大系数曲线揭示,模型围岩和站厅衬砌结构在峰值加速度0.5 g后进入塑性破坏状态;站台衬砌结构在峰值加速度0.3 g后从塑性状态逐步进入破坏状态,同时能量耗散逐渐增加。随着地震动强度的增大,站厅横断面的相对位移增幅显著,开口断面与非开口断面的相对位移峰值差距进一步扩大。结构的裂缝主要分布在纵向,站台直墙中部的纵向裂缝宽且长,而站厅直墙中部未产生明显裂缝。随着地震动强度增大,结构传递函数的主频逐渐减小,在弹性阶段和塑性破坏阶段,结构主频分别为22.7 Hz和18.5 Hz。当地震动横向激励时,竖向联络通道下断面(VL)相同位置的拉应变均大于水平联络通道右断面(HR),最大拉应变出现在竖向联络通道的下断面的拱肩处。

    Abstract:

    Abstract:To investigate the dynamic characteristics of the tunnel-group metro station in rock site under earthquake, a large-scale shaking table test model of the structure with a scale of 1:30 was designed. The model was subjected to transverse inputs of peak accelerations of 0.07 g, 0.15 g, 0.21 g, 0.30 g, 0.50 g, 0.70 g, and 1.0 g, representing seven different intensities of artificial seismic waves.The study focused on the acceleration response characteristics, displacement response characteristics, structural damage modes, and dynamic strain response characteristics of the tunnel-group metro station under strong earthquakes. The results showed that the amplification factors curve of Arias Intensity reveals that the model rock and the hall lining structure entered into the plastic damage state after the peak acceleration of 0.5 g. The platform lining structure gradually entered into the damage state from the plastic state after the peak acceleration of 0.3 g, and the energy dissipation increases gradually. With the increase of earthquake intensity, the relative displacement of the hall cross-section increases significantly, and the gap between the peak relative displacements of the open section and the non-open section widens further. The cracks of the structure are mainly distributed in the longitudinal direction, and the longitudinal cracks in the middle of the straight wall of the platform are wide and long, while the middle of the straight wall of the hall did not produce obvious cracks. With the increase in seismic motion intensity, the main frequency of the structural transfer function gradually decreased, with the main frequencies being 22.7 Hz and 18.5 Hz in the elastic and plastic damage stages, respectively. The tensile strains at the same locations in the VL section (the lower section of the vertical connecting passage) are larger than those in the HR section (the right section that connects the horizontal connecting passage) under transverse excitations, and the maximum tensile strain occurs in the arch shoulder of the VL section.

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李若舟,贺维国,袁勇,李清菲.强震作用下岩石场地群洞地铁车站试验研究[J].防灾减灾工程学报,,():

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  • 在线发布日期:2024-03-25
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