地震易损性是指在不同地震强度下结构发生不同程度破坏的概率。为考虑到地震动的随机性，且影响隧道动力响应的地震动强度参数（intensity measure, IM）众多，选择合适的地震动强度参数对隧道抗震设计和易损性分析具有重要意义。以软土地区浅埋及深埋隧道为例，基于增量动力分析方法（incremental dynamic analysis, IDA），展开了大量非线性动力计算，通过对18个地震动强度参数（IMs）与隧道破坏参数（damage measure, DM）进行对数线性回归分析，分别从有效性、实用性和效益性这三个方面，对地震动强度参数与隧道破坏参数进行分析评价。研究结果表明：地表峰值加速度（peak ground acceleration, PGA）是浅埋隧道地震易损性分析的最优地震动强度参数（IM），其次是地表峰值速度（peak ground velocity, PGV）。对于深埋隧道地表峰值速度（PGV）是地震易损性分析的最优地震动强度参数（IM），其次是速度反应谱密度（velocity spectrum intensity, VSI）。上述研究成果为不同工况条件下隧道抗震性能的评价方法提供了依据，也为后续进一步开展不同服役期、不同结构形式隧道结构易损性计算奠定了基础。

The probability of a structure being or exceeding a specific damage state for various seismic intensities was described by seismic vulnerability. Considering the randomness of ground motion, there existed numerous ground motion intensity measures (IMs) that will affect the dynamic response of tunnel. Therefore, selection of suitable ground motion intensity measures will be of great significance for the seismic design and vulnerability assessment of tunnels. Typical shallow and deep tunnels in soft soil were chosen as examples to study suitable ground motion intensity measure. Numerous nonlinear time-history calculations were conducted using incremental dynamic analysis (IDA) method. Then, the selected 18 IMs were tested for several metrics, i. e. efficiency, practicality and proficiency based on an extended number of logarithmic regression analyses between the IMs and the damage measure (DM) for the examined tunnels in soft soil deposits. The results revealed that the peak ground acceleration (PGA) at the ground surface may be considered as the optimal IM for shallow tunnel, followed by peak ground velocity (PGV), while PGV is the optimal IM for the deep tunnel, followed by velocity spectrum intensity (VSI). This result provides a basis for evaluating the seismic performance of tunnels under different working conditions. It also lays a foundation for further calculation of structural vulnerability of tunnels with different service periods and different structural forms.