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首页> 外文会议>International conference on case histories in geotechnical engineering >In Situ Investigation of False-Positive Liquefaction Sites in Christchurch, New Zealand: Palinurus Road Case History
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In Situ Investigation of False-Positive Liquefaction Sites in Christchurch, New Zealand: Palinurus Road Case History

机译：新西兰克赖斯特彻奇的假阳性液化站点的现场调查：Palinurus道路案例历史

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Over 31,000 cone penetration test (CPT) soundings collected in Christchurch, New Zealand, in the aftermath of the 2010-2011 Canterbury earthquake sequence (CES) are available on the New Zealand Geotechnical Database (NZGD). This incredible dataset has allowed for detailed comparisons between observed land performance during the CES and CPT-based retrospective predictions of liquefaction triggering on an unprecedented spatial scale. Results from these comparisons indicate a significant number of "false positive" CPT-based liquefaction triggering predictions in which severe liquefaction was predicted but no, or very minor, surface manifestations of liquefaction were observed. In August of 2015, an in situ site characterization study was initiated to further investigate 31 false positive liquefaction sites in Christchurch. The testing program included: (a) seismic CPT, (b) high-resolution compression, and shear wave velocity measurements made via direct-push crosshole testing, and (c) continuous soil sampling via sonic drilling. This paper presents in situ test results from one of these case history sites (Palinurus Road), at which moderate surficial evidence of liquefaction was observed over part of the site during the February 2011 Christchurch earthquake, but not over the remainder of the site. Liquefaction triggering analyses performed on 12 CPT soundings across the site were very similar, yielding liquefaction potential indices indicative of severe liquefaction across the entire site. Refined analyses including consideration for (1) site-specific fines content data, (2) partial saturation (as indicated by Vp), (3) coarse-to-fine-grained soil interlayering, (4) non-liquefying crust thickness, and (5) soil microstructure are performed to attempt to reconcile the over-prediction of liquefaction severity. The over-prediction of liquefaction severity for the 2010 Darfield earthquake was reconciled as result of these adjustments; however, the over-prediction of liquefaction severity for the 2011 Christchurch earthquake was not reconciled.
机译：在2010-2011年坎特伯雷地震序列（CES）之后，在新西兰基督城收集了超过31,000个圆锥穿透试验（CPT）测深，可在新西兰岩土数据库（NZGD）上获得。这个令人难以置信的数据集允许在CES期间观察到的土地性能与基于CPT的液化触发的回顾性预测进行空前的空间尺度之间的详细比较。这些比较的结果表明大量基于“假阳性” CPT的液化触发预测，其中预测了严重的液化，但未观察到或很少观察到液化的表面表现。 2015年8月，发起了现场原位表征研究，以进一步调查克赖斯特彻奇的31个假阳性液化位。测试程序包括：（a）地震CPT;（b）通过直接推孔测试进行高分辨率压缩和剪切波速度测量;以及（c）通过声波钻探进行连续土壤采样。本文介绍了其中一个案例历史记录站点（Palinurus Road）的现场测试结果，在该站点中，在2011年2月克赖斯特彻奇地震的部分站点上观察到了中度液化的表面证据，但在站点的其余部分未观察到液化的迹象。在整个站点上对12个CPT探测进行的液化触发分析非常相似，产生的液化潜力指数表明整个站点的严重液化。精细的分析，包括考虑以下因素：（1）特定地点的细粉含量数据，（2）部分饱和度（用Vp表示），（3）粗粒至细粒土壤夹层，（4）不液化地壳厚度和（5）进行土壤微观结构以试图调和对液化严重程度的过度预测。由于这些调整，2010年达菲尔德地震的液化严重程度的高估得到了调和;然而，对2011年克赖斯特彻奇地震的液化严重程度的高估并没有得到证实。

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