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頁籤選單縮合
題名 | 標準貫入試驗值之水平空間分布模擬=Dimensional Distribution Simulation of SPT-N Values |
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作者姓名(中文) | 黃文昭; 楊士弘; 魏培杰; | 書刊名 | 地工技術 |
卷期 | 141 2014.09[民103.09] |
頁次 | 頁37-44 |
專輯 | 邊坡規範及地錨岩錨更新維護 |
分類號 | 441.1 |
關鍵詞 | 半變異數; 克利金法; 標準貫入試驗值; 空間變異性; Semivariance; Simple kriging; Standard penetration test n values; Spatial variability; |
語文 | 中文(Chinese) |
中文摘要 | 由於具延續性之長距離公路或是大範圍工程基地等之土壤一般及力學性質變化可能會影響到工程設計,現今愈來愈多研究著眼於土壤參數之空間變異性探討。本研究主要針對標準貫入試驗值之水平方向空間分佈進行探討,研究區域之土層性質主要為砂性土壤,研究中針對鑽孔資料之標準貫入試驗值進行空間變異性分析。首先從已知資料庫中求取相對應之半變異數函數,再利用簡易克利金法(Simple Krigging)來推估現地標準貫入試驗值的分布,並將推估值與實際值進行比較。研究結果顯示,當實際標準貫入試驗值在介於15到30之間,其模擬結果相對較佳;而大於30或小於15之模擬結果較差,可能為使用簡易克利金法之緣故。最後利用本研究之模擬方式,針對大範圍區域之標準貫入試驗值進行模擬,可以得到整體區域標準貫入試驗值之分佈狀況,此一模擬結果可以提供較大範圍區域初步之設計參數分佈情形,後續可做為上述工程如公路或是較大範圍工程基地之設計參數評估,藉此將設計參數之空間變異特性納入考量。 |
英文摘要 | Variability of soil properties for roadways or large scale construction projects could influence the design and analysis results. In this research, we focused on the horizontal variability of standard penetration test N values (SPT-N) in a sandy construction site with 190 soil borings. We used standard penetration test N values from drilling data to evaluate the spatial variability for the top 5 meters of the site. Firstly, we evaluate the semi-variogram from drilling information, employing the coordinates and the corresponding values at each soil boring. Then, Simple Krigging was applied to estimate the distribution of standard penetration test N values and compared with true values. The result of this study is that when true SPT-N values is between 15 to 30 blow counts, the simulation results were better. When true SPT-N values is greater than 30 or less than 15 blow counts, the simulation is not close to the actual data. The less accurate estimation could be resulted from the selection of Simple Krigging Method. Finally, we used Simple Krigging to analyze SPT-N values of the whole construction site to obtain the distribution of SPT-N values across the site. This simulation result can provide a preliminary estimation of the design parameter, such as the SPT-N values in this study. Thus the simulation can be employed in initial design and cost estimation can be evaluated. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。