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| 題 名 | 應用CPT資料預測海洋大型基樁在臺灣離岸風場的軸向承載力=Application of CPT Data to Predict the Axial Capacity of Large Offshore Piles in Taiwan Offshore Wind Farm |
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| 作 者 | 紀昭銘; 黃普源; 李宥霖; | 書刊名 | 海岸及海洋工程學刊 |
| 卷 期 | 20:1/2 2024.11[民113.11] |
| 頁 次 | 頁1-23 |
| 分類號 | 448.165 |
| 關鍵詞 | 圓錐貫入試驗; 建築物基礎構造設計規範; 軸向承載力; 離岸基礎; Cone penetration test; CPT; Design code and specifications of building foundations; DCSBF; Axial capacity; Offshore foundation; |
| 語 文 | 中文(Chinese) |
| DOI | 10.6266/JCOE.202410_20(1_2).0001 |
| 中文摘要 | 圓錐貫入試驗（Cone Penetration Test, CPT）的資料廣泛被用於離岸基礎工程的土壤分類、分層以及強度參數。由於基樁貫入土壤的行為類似於CPT，因此國外已有多種預測打擊樁的CPT-based軸向承載力設計方法，例如Imperial College Pile（ICP）法、University of Western Australia（UWA）法和Unified CPT Method（UCM）法。因大多數商業程式不包括臺灣建築物基礎構造設計規範（Design Code and Specifications of Building Foundations, DCSBF）的軸向承載力計算方法，本研究開發模組化自動程式（Chao Marine Anchor Program, C.MAP），並且應用臺灣西部海域土壤CPT數據討論不同方法軸向承載力的差異。文中呈現在不同CPT土壤分類版本下，台灣電力公司離岸風力發電第二期計畫之五個鑽孔土壤分類的變化結果。再者，DCSBF與其他CPT-based方法在砂土與黏土的考量因素也在文中做進一步的討論。結果顯示DCSBF缺乏對摩擦疲勞、覆土壓修正與樁底型式的考慮，因此五個鑽孔之承載力預測結果皆呈現不保守的趨勢。其中四個鑽孔的DCSBF的靜力學法（DCSBF's Static Method, DCSBF-SM）與CPT法（DCSBF-CPT）的評估結果相當接近，但都遠大於國外CPT-based承載力方法，甚至可達三倍。由於離岸基礎的設計考量與尺寸與陸域基礎不同，且臺灣海洋土壤條件複雜，因此參考國外CPT-based軸向承載力設計方法制定臺灣離岸基礎設計指引至關重要。 |
| 英文摘要 | Cone Penetration Test (CPT) data is widely used in offshore foundation engineering for classification, stratification, and shear strength parameters of soils. Because the behavior of a pile penetrating into soils is similar to that of the CPT, there are a number of CPT-based design methods for the evaluation of the axial capacity of driven piles have been developed internationally, such as the Imperial College Pile (ICP) method, the University of Western Australia (UWA) method, and the Unified CPT Method (UCM) method. Since most commercial programs do not include the computational methods of the axial capacity suggested by Taiwan's Design Code and Specifications of Building Foundations (DCSBF), this study develops a modular automated program Chao Marine Anchor Program (C.MAP) to discuss the difference in the axial capacity evaluated by various methods with CPT data from Taiwan western marine soils. The paper presents the changes in soil classification results for five boreholes from the Taiwan power company offshore wind power Phase II project under different CPT soil classification versions. Furthermore, the paper investigates the factors considered by the DCSBF and other CPT-based methods for sand and clay. The results indicate that the DCSBF method suffers from a lack of consideration for friction fatigue, overburden pressure correction, and pile-end type effects, so the bearing capacity prediction results of the five boreholes all show an unconservative trend. The evaluation results between DCSBF's static method (DCSBF-SM) and CPT-based method (DCSBF-CPT) for four of the boreholes are quite similar, but both are significantly higher than those of foreign CPT-based methods, even reaching up to three times greater. Because the design considerations and size of offshore foundations differ from those of onshore foundations, and the marine soil conditions in Taiwan are complex, it is critical to refer to foreign CPT-based axial bearing capacity design methods to formulate Taiwan's offshore foundation design guidelines. |
本系統中英文摘要資訊取自各篇刊載內容。