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Seismic vulnerability assessment of rectangular cut-and-cover subway tunnels

机译：矩形明挖地铁隧道的地震易损性评估

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摘要

This study develops fragility curves for rectangular cut-and-cover tunnels from nonlinear frame analyses. Fragility curves are generated for single, double, and triple boxes constructed for the subway system. A wide range of site profiles is used to evaluate the effect of soil characteristics on the calculated fragility curve. The fragility curves are developed for minor, moderate, and extensive damage states. The damage indices defined in a previous study as the ratio of the elastic moment demand to the yield moment at the critical section of the tunnel lining was used in the analyses. Fragility curves of the tunnels are generated in terms of surface peak ground acceleration (PGA), peak ground velocity (PGV), and PGV/V-s30 (V-s30 is the time-averaged shear-wave velocity to 30 m depth). The results highlight that the fragility curve is highly sensitive to the site profile, and that PGA based curves result in the largest scatter. The effect of the site profile is significantly reduced when PGV/V-s30 is used, where the fragility curves for all site profiles fall within a narrower band. This is because both the intensity of the ground motion and the soil stiffness is accounted for in the parameter PGV/V-s30. Considering the importance of site amplification characteristics, it is recommended that PGV/V-s30 be used instead of PGA and PGV in the generation of fragility curves of underground structures. Comparisons also demonstrate that multi-box tunnels are more vulnerable to earthquake damage compared with single box tunnels because the seismic demand is always larger.
机译：这项研究从非线性框架分析中得出矩形开挖-覆盖隧道的脆性曲线。将为地铁系统构造的单，双和三箱生成易碎性曲线。广泛的场地概况可用于评估土壤特性对计算的脆性曲线的影响。脆弱性曲线针对轻微，中等和广泛的损坏状态而开发。在先前的研究中，将破坏指数定义为隧道衬砌关键部分的弹性矩需求与屈服矩之比。隧道的易碎性曲线是根据地面峰值地面加速度（PGA），峰值地面速度（PGV）和PGV / V-s30（V-s30是至30 m深度的时间平均剪切波速度）生成的。结果表明，脆性曲线对位点轮廓高度敏感，而基于PGA的曲线导致最大的散布。当使用PGV / V-s30时，位点轮廓的影响会大大降低，其中所有位点轮廓的脆性曲线都位于较窄的范围内。这是因为地面运动的强度和土壤刚度都在参数PGV / V-s30中考虑。考虑到现场放大特性的重要性，建议在地下结构的脆性曲线生成中使用PGV / V-s30代替PGA和PGV。比较还表明，与单箱式隧道相比，多箱式隧道更容易遭受地震破坏，因为地震需求始终较大。

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