Gravel liquefaction assessment using dynamic cone penetration and shear wave velocity tests based on field performance from the 1964 Alaska earthquake
Gravel liquefaction assessment using dynamic cone penetration and shear wave velocity tests based on field performance from the 1964 Alaska earthquake
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DOI：
10.1016/j.soildyn.2022.107357
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发表时间：
2022
影响因子：
4
通讯作者：
Jashod Roy;K. Rollins;A. Athanasopoulos-Zekkos;McKay Harper;Nicolas Linton;Michelle Basham;W. Greenwood;D. Zekkos
中科院分区：
文献类型：
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作者：
Jashod Roy;K. Rollins;A. Athanasopoulos-Zekkos;McKay Harper;Nicolas Linton;Michelle Basham;W. Greenwood;D. Zekkos
在岩土工程实践中，利用现场测试来评价砾石土的液化势仍然是一个挑战。中国动力触探试验(DPT)提供了贝克尔贯入试验(BPT)和标准贯入试验(SPT)的替代方案。基于汶川7.9级地震的现场表现数据，中国的DPT最近被与液化阻力相关联。在这项研究中，利用DPT和剪切波速测量，对1964年阿拉斯加地震中发生砂砾液化的8个地点和瓦尔迪兹的2个地点的抗液化能力进行了评估。基于DPT的液化触发曲线对所有试验点的液化势进行了中等精度的预测。经过能量校正后，SPT锤的N‘120击数与DPT锤的击数基本一致。反向计算的能量修正系数通常在理论能量修正系数的10%以内。这些结果表明，DPT可以为许多砾石土提供准确和经济的液化危险评估。使用目前可用的基于VS的砂土触发曲线进行的液化评估通常表明，在阿拉斯加发生液化的地点没有发生液化。相反，基于AVS的触发曲线从砾石土场地的数据集开发出来，正确地预测了所有场地的液化。
Evaluating the liquefaction potential of gravelly soils using in-situ testing remains a challenge in geotechnical engineering practice. The Chinese Dynamic Cone Penetration (DPT) test provides an alternative for in-situ testing in gravelly soils to Becker Penetration Test (BPT) and the Standard Penetration test (SPT). The Chinese DPT was recently correlated with liquefaction resistance based on field performance data from theMw7.9 Wenchuan earthquake. In this study, liquefaction resistance was evaluated using the DPT and shear wave velocity measurements at eight sites in Seward and Old Valdez, Alaska, where gravel liquefaction took place and two sites in Valdez, where no liquefaction occurred in the 1964 Alaska earthquake. The DPT-based liquefaction triggering curve predicted liquefaction potential at all test sites with moderate accuracy.N′120blow counts from SPT hammers were generally consistent with those from the DPT hammer after energy correction. Back-calculated energy correction factors were typically within 10% of the theoretical energy correction factor. These results suggest that the DPT can provide liquefaction hazard evaluations accurately and economically for many gravelly soils. Liquefaction evaluations using currently availableVs-based triggering curves developed for sands often indicated no liquefaction at sites where liquefaction occurred at the Alaska sites. In contrast, aVs-based triggering curve developed from a data set of gravelly soil sites correctly predicted liquefaction at all sites.