| 摘要: | 有鑒於剪力波速(Vs)與土壤動態反應之間有良好的相關性，以及標準貫入
試驗(Standard Penetration Test, SPT)在大地工程現地鑽探調查中被廣泛的使用，並針對所有、砂性、黏性土壤提出了SPT-N與Vs之間的多種經驗關係。有關於本研究所使用在世界各地的數據情形下，進一步說明在本文中，我們基於所有土壤20個、砂性土壤15個、黏性土壤11個對於 SPT-N和Vs之間的非臺灣本地之經驗關係，提出了臺灣南部位於高雄市中心區的最佳剪力波速估計值。
它說明了，非臺灣本地砂土經驗關係的15個估計值計算出了一個平均值，平均而言，優於每個非當地經驗模型的單個估計值，這與我們在日常生活中息息相關；這表示平均值定律有著相當之重要性。此外，基於統計學上的 Kolmogorov-Smirnov (K-S)檢定檢驗的結果表明，我們還給出了研究區域的最佳估計剪力波速(Vs)之機率分布。因此，這也說明了近年來對於在大地工程中越來越受到關注的基於可靠性上的分析至關重要。
因此，出於實際目的及回顧過往的研究可以得知建議使用基於未經修正的
SPT-N值為所有土壤、砂土、黏土開發的經驗方程。對於已經存在和新提出的經驗方程之間的差異主要是由於研究地點的特定地質條件、數據分析的數量以及SPT試驗操作習慣和地震勘測的程序有關。鑒於此，應謹慎使用這些經驗方程，並盡可能對照測得的Vs值進行檢查。;Owing to the good correlation between shear wave velocity (Vs) and soil dynamic responses, and the widespread use of the standard penetration test (SPT) for geotechnical site investigation, several empirical relationships between SPT-N and Vs have been proposed for sandy soil based on data all over the world. In this paper, we present the best-estimate shear wave velocity for the downtown areas of Kaohsiung City in southern Taiwan, based on 15 non-local empirical relationships between SPT-N and Vs for sandy soil.
It shows that the mean value of the 15 estimates from the non-local relationships, averagely speaking, outperforms the individual estimates from each non-local model, which is another demonstration of the power of average that is in existence and exercised in our daily life. In addition, based on the result of statistical goodness-of-fit tests, we also present the best-estimate Vs probability distribution for the study area, which is essential to the reliability-based analyses that have gained more and more attention in geotechnical engineering.
Therefore, for practical purposes and reviewing past studies, it is recommended to use empirical equations based on uncorrected SPT-N values for all soil, sand, and clay development. The differences between the existing and newly proposed empirical equations are mainly due to the specific geological conditions of the study site, the amount of data analyzed, the operating habits of SPT experiments, and the procedures of the seismic survey. For this reason, these empirical equations should be used with caution and checked against measured Vs values whenever possible. |
