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采用基于静力弹塑性分析的地下结构破坏定量预测模型,定量研究地铁隧道结构在地震水平荷载作用下的破坏程度及概率。分析了地震需求谱及隧道结构抗震能力曲线的建立过程,将二者交点作为地震中隧道结构极限承载能力,结合脆弱性曲线确定隧道的震害水平。通过实例计算说明了震害预测流程,得到特定条件下地下隧道遭受轻微、中等以及严重破坏的概率。由于隧道等地下结构在地震过程中受到周围岩土体的约束,其动力响应形式与地面结构不同。通过调整隧道结构有效阻尼,尝试将静力弹塑性分析方法用于地下结构震害的工程计算。
Quantitative prediction model of underground structure damage based on static elasto-plastic analysis is adopted to quantitatively study the damage degree and probability of metro tunnel structure under earthquake horizontal load. The seismic demand spectrum and the seismic capacity curve of the tunnel structure are analyzed. The intersection of the two is taken as the ultimate bearing capacity of the tunnel structure in the earthquake and the vulnerability of the tunnel is determined by the vulnerability curve. An example calculation shows the process of earthquake damage prediction and the probability of underground tunnel suffering from slight, medium and severe damage under certain conditions is obtained. Since the underground structures such as tunnels are constrained by the surrounding rock and soil during the earthquake, their dynamic response forms are different from the ground structures. By adjusting the effective damping of tunnel structure, the static elasto-plastic analysis method is tried to be used in engineering calculation of earthquake damage to underground structures.