臺灣博碩士論文加值系統

鑽掘樁為大型構造物常用的深基礎，其軸向承載行為於過去數十年間已被廣泛的研究，並有許多學者提出各種類型的分析計算公式。在世界各地經常遭遇到的土層構造為複合地層，然而既有分析計算公式多是由探討基樁在單一土層的研究所得，其對一般性土層的適用性為何，尚待實質檢討。本研究藉由蒐集所得世界各地在複合土層鑽掘樁之試樁資料庫，探討樁受軸向壓載時－既有分析設計模型所計算出的承載力是否合理。進行檢討之分析模型包括：(1) 美國聯邦公路管理局法(FHWA(2010) method)，(2) 內政部營建署─建築物基礎構造設計規範(TBFDS (2001) method)。本研究針對樁身摩擦阻抗及樁底承載力分別探討，其預測結果均具離散性及高估現象。評估樁身阻抗時，單一土層之結果均較在複合土層之結果好，而各類土層含量比例的多寡對樁身阻抗預測之結果，初步並未發現有明顯之影響效應。本研究進一步並分析樁身阻抗及樁底承載力各分析公式之模型偏差係數，在複合土層中的鑽掘樁之軸向承載力預估，在考量偏差係數後可得較合理且一致的結果。

Drilled shafts have been the preferred foundation system for infrastructure and buildings. Significant advances in drilled shaft research have been made over the past few decades, where many scholars have suggested analysis models. Most past models were developed based on data of drilled shafts in a predominate type of geomaterial, such as clay, sand, gravel, or rock. Ground profile with multiple layers is often encountered in several metropolises around the world. It is warranted to assess the applicability of existing models on shafts in a ground profile with multiple layears. In this study, a database of load test case histories for drilled shafts in multiple strata is compiled. Two commonly used analysis models that can considere all types of geomaterials along the depth of drilled shafts are evalauated critically, namely (1) approaches given by the drilled shafts design guidelines by the Federal Highway Administration (FHWA(2010) method) and (2) design recommendations given by the Taiwan Buildings Foundation Design Specification (TBFSD (2001) method). Tip and side ressitances were first evaluated separately. On average, both models overpredict the side and tip resistances with significant scatter. For side resistance, prediction is better for shafts in a single soil (sand or clay) profile than that in a mixed profile. The model bias or model factor was computed and analyzed for each analysis equation. For the compression capacity, a consistent evaluation can be resulted with consideration of these model factors.

誌謝 I
論文摘要 II
ABSTRACT III
目錄 IV
圖目錄 VI
表目錄 X
第一章　緒論 1
1.1　研究動機與目的 1
1.2　研究內容 1
1.3　論文架構 2
第二章　詮釋法、承載力的評估方法 3
2.1　基樁載重試驗曲線詮釋法 3
2.1.1　未達破壞試樁曲線處理方法 9
2.2　鑽掘樁之承載力分析 10
2.2.1　基樁靜力學承載理論 10
2.2.2　樁身摩擦阻抗分析 10
2.2.3　樁底承載力分析 14
第三章　地工參數評估 16
3.1　土壤單位重(γt) 16
3.2　土壤之有效摩擦角(’) 18
3.3　現地側向土壓力係數(Ko) 19
3.4　過壓密比(OCR) 20
3.5　土壤楊氏模數(Eu、Ed) 22
第四章　試樁資料庫及軸向壓載之詮釋 24
4.1　試樁資料庫及分類 24
4.2 軸向壓載變位分析 32
第五章　軸向壓載承載力探討 62
5.1　樁身摩擦阻抗及樁底承載力之貢獻量 62
5.2　美國聯邦公路管理局法評估(FHWA) 64
5.2.1 樁身阻抗評估 67
5.2.2　樁底承載力評估 78
5.2.3　修正的評估模型 87
5.3　內政部營建署─建築物基礎構造設計規範(TBFDS (2001)) 89
5.3.1　樁身阻抗評估 90
5.3.2　樁底承載力評估 100
5.3.3　修正的評估模型 109
第六章　結論與建議 111
6.1　結論 111
6.2　建議 112
參考文獻 113
附　錄 116

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