Assessment of the Relative Predictive Capabilities of CPT-Based Liquefaction Evaluation Procedures : Lessons Learned from the 2010-2011 Canterbury Earthquake Sequence
Assessment of the Relative Predictive Capabilities of CPT-Based Liquefaction Evaluation Procedures : Lessons Learned from the 2010-2011 Canterbury Earthquake Sequence
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基于 CPT 的液化评估程序的相对预测能力评估：从 2010-2011 年坎特伯雷地震序列中汲取的经验教训
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发表时间：
2015
期刊：
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通讯作者：
B. Bradley
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作者：
R. Green;B. Maurer;M. Cubrinovski;B. Bradley
2010-2011年坎特伯雷地震序列（CES）的数据提供了一个前所未有的机会，以评估和推进液化触发评估的实践现状。为此，本文使用CES中的选定案例历史来评估三种替代的基于CPT的简化液化评价程序的预测能力：Robertson和Wride（1998）; Moss等人（2006）; Idriss和Boulanger（2008）。此外，液化潜力指数（LPI）框架预测的严重程度，表层液化表现也被用来评估液化评价程序的预测能力。尽管并非没有限制，但为此目的使用LPI框架避免了为研究地点选择“关键”层及其代表性属性的需要，这固有地涉及主观性，因此一直是研究人员之间争论的焦点。结果发现，虽然所有评估的液化触发评估程序在所分析场地的参数范围内表现良好，但Idriss和Boulanger（2008年）提出的程序产生的预测比其他程序更符合现场观察。然而，使用Idriss和Boulanger（2008年）程序结合Christchurch特定相关性来估计细粉含量显示出相对于使用通用细粉含量相关性的性能下降。因此，Idriss和Boulanger（2008）程序的罚款校正需要进一步研究。
Data from the 2010-2011 Canterbury earthquake sequence (CES) provides an unprecedented opportunity to assess and advance the current state of practice for evaluating liquefaction triggering. Towards this end, select case histories from the CES are used herein to assess the predictive capabilities of three alternative CPT-based simplified liquefaction evaluation procedures: Robertson and Wride (1998); Moss et al. (2006); and Idriss and Boulanger (2008). Additionally, the Liquefaction Potential Index (LPI) framework for predicting the severity of surficial liquefaction manifestations is also used to assess the predictive capabilities of the liquefaction evaluation procedures. Although it is not without limitations, use of the LPI framework for this purpose circumvents the need for selecting “critical” layers and their representative properties for study sites, which inherently involves subjectivity and thus has been a point of contention among researchers. It was found that while all the assessed liquefaction triggering evaluation procedures performed well for the parameter ranges of the sites analyzed, the procedure proposed by Idriss and Boulanger (2008) yielded predictions that are more consistent with field observations than the other procedures. However, use of the Idriss and Boulanger (2008) procedure in conjunction with a Christchurch-specific correlation to estimate fines content showed a decreased performance relative to using a generic fines content correlation. As a result, the fines correction for the Idriss and Boulanger (2008) procedure needs further study.