Abstract This study examines the influence of soil aging on Standard Penetration Test (SPT) N-Vs correlations, and seismic site classification. Energy-corrected SPT-Vs correlations are developed for two regions where subsurface layering consists of soil deposits with very young geotechnical ages according to the last critical soil disturbance that occurred in the study areas. It is observed that the uncorrected correlations of the current study fall into the lower bound of the uncorrected SPT-Vs correlations existing in the literature due to soil aging effects. To better illustrate the effects of soil aging on SPT-Vs correlations, the uncorrected correlations from the literature and this study are divided into two age categories of Holocene and Pleistocene according to their geological age. Using the two age categories, the boundaries proposed in the NEHRP for different seismic site classes are divided into three zones according to their uncertainty level regarding seismic site classification. The results clearly indicate the need to consider the age of soil deposits for seismic site classification when using the SPT method to avoid incorrect seismic site classification. Additionally, it is found that the use of raw (uncorrected) SPT N values can lead to incorrect seismic site classification, with either conservative or unconservative results depending on the Energy Transfer Ratio (ETR) of the SPT hammer used for the seismic site class determination.

中文翻译：

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土壤老化对 SPT-Vs 相关性和地震场地分类的影响

摘要 本研究检验了土壤老化对标准渗透试验 (SPT) N-Vs 相关性和地震现场分类的影响。根据研究区域发生的最后一次临界土壤扰动，为两个区域开发了能量校正的 SPT-Vs 相关性，其中地下分层由具有非常年轻岩土工程年龄的土壤沉积物组成。据观察，由于土壤老化效应，当前研究的未校正相关性落入文献中存在的未校正 SPT-Vs 相关性的下限。为了更好地说明土壤老化对 SPT-Vs 相关性的影响，将文献和本研究中未校正的相关性根据其地质年龄分为全新世和更新世两个年龄类别。使用两个年龄类别，NEHRP 中针对不同地震地点类别提出的边界根据地震地点分类的不确定性水平分为三个区域。结果清楚地表明，在使用 SPT 方法以避免错误的地震站点分类时，需要考虑土壤沉积物的年龄进行地震站点分类。此外，发现使用原始（未校正）SPT N 值会导致不正确的地震站点分类，保守或非保守的结果取决于用于确定地震站点类别的 SPT 锤的能量传递比 (ETR) . 结果清楚地表明，在使用 SPT 方法以避免错误的地震站点分类时，需要考虑土壤沉积物的年龄进行地震站点分类。此外，发现使用原始（未校正）SPT N 值会导致不正确的地震站点分类，保守或非保守的结果取决于用于确定地震站点类别的 SPT 锤的能量传递比 (ETR) . 结果清楚地表明，在使用 SPT 方法以避免错误的地震站点分类时，需要考虑土壤沉积物的年龄进行地震站点分类。此外，发现使用原始（未校正）SPT N 值会导致不正确的地震站点分类，保守或非保守的结果取决于用于确定地震站点类别的 SPT 锤的能量传递比 (ETR) .