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研究生:蔡秉程
研究生(外文):Bing-Cheng Tsai
論文名稱:砂土地盤浮力基礎之研究
論文名稱(外文):THE STUDY OF THE FLOATING FOUNDATION IN SAND
指導教授:沈茂松沈茂松引用關係
指導教授(外文):Mau-Song Sheen
學位類別:碩士
校院名稱:國立高雄應用科技大學
系所名稱:土木工程與防災科技研究所
學門:工程學門
學類:土木工程學類
論文種類:學術論文
論文出版年:2006
畢業學年度:94
語文別:中文
論文頁數:310
中文關鍵詞:浮力基礎筏基連續壁永久性檔土璧體
外文關鍵詞:floating foundationraft foundationdiaphragm wallpermanent wall
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覆碗入水,碗下氣泡使碗上昇,地下水下甚軟弱地盤之基礎下方加入氣泡空間,理論上其承載力增加沉陷量會降低,但其增加之浮力與基地面積及氣泡體積成正比。連續壁被設計為臨時性擋土壁體兼具永久性結構體,具翼版(連續壁)之筏基(Raft foundation)或獨立基腳即為浮力基礎(floating foundation),本研究得知在砂土地盤充氣式與充土式浮力基腳之翼版(連續壁)的厚度與入土深度會增加基礎承載力與降低基礎的沉陷量。在砂土地盤充土式浮力基腳比一般平底基腳承載力提高1.4~1.6倍。
Putting a bowl upside-down in the water, the air in the bowl will make it rise. Thus, adding the air into the foundation deeper than groundwater level in soft ground should reduce the settlement as well as to increase the bearing capacity of foundation theoretically but its buoyancy force increased is in direct proportion to the base and the volume of the air bubble. In general, The diaphragm walls are not only used as retaining structures but also as part of permanent structure. However, the diaphragm wall connected with raft foundation or individual footing could be thought to be a floating foundation. This study shows the settlement and bearing capacity of the floating foundation in sand are affected by the embedded depth and thickness of the foundation. Such foundation can reduce the foundation settlement and increase bearing capacity significantly rather than conventional type of foundation. Compared with the use of the conventional type of foundation, it is recommended that the use of floating foundation can increase the bearing capacity up to 40%~60%.
中文摘要 ------------------------------------------------------- i
英文摘要 ------------------------------------------------------- ii
致謝 ------------------------------------------------------- iii
目錄 ------------------------------------------------------- iv
表目錄 ------------------------------------------------------- vi
圖目錄 ------------------------------------------------------- xiii
照片目錄 ------------------------------------------------------- xxi
符號說明 ------------------------------------------------------- xxv
第一章 緒論---------------------------------------------------- 1
1.1 前言-------------------------------------------- 1
1.2 研究目的---------------------------------------- 1
1.3 研究方法---------------------------------------- 2
第二章 文獻回顧------------------------------------------------ 3
2.1 淺基礎承載力之相關文獻回顧------------------------ 3
2.1.1 淺基礎土壤承載之破壞模式-------------------------- 3
2.1.2 淺基礎之土壤承載力理論---------------------------- 4
2.2 深基礎承載力之相關文獻回顧------------------------ 14
2.2.1 基樁的破壞模式----------------------------------- 14
2.2.2 深基礎之承載力破壞模式---------------------------- 15
2.3 基樁的垂直承載力之評估---------------------------- 16
2.3.1 靜力學法---------------------------------------- 16
2.3.2 貫入試驗法--------------------------------------- 18
2.3.3 樁載重試驗法------------------------------------- 18
2.3.4 極限承載力決定方法------------------------------- 20
2.3.5 打樁動態分析法----------------------------------- 22
2.4 基礎沉陷相關文獻回顧------------------------------ 23
2.4.1 瞬時沉陷---------------------------------------- 23
2.4.2 主要壓密沉陷------------------------------------- 24
2.4.3 二次壓密沉陷------------------------------------- 25
第三章 理論推導------------------------------------------------ 26
3.1 浮力基礎原理------------------------------------ 26
3.2 氣泡式浮力基礎---------------------------------- 29
3.3 充土式浮力基礎---------------------------------- 30
3.4 實務論文之認定---------------------------------- 30
第四章 浮力基礎模型試驗與討論----------------------------------- 34
4.1 試驗儀器及設備---------------------------------- 34
4.2 試驗材料-砂------------------------------------ 34
4.3 模型製作--------------------------------------- 35
4.3.1 水泥槽(砂坑)---------------------------------- 35
4.3.2 試體模型製作----------------------------------- 35
4.4 試驗流程--------------------------------------- 36
4.5 模型試驗觀察及記錄------------------------------ 38
4.5.1 充氣式基礎之容許承載力量測----------------------- 38
4.5.2 充土式基礎之容許承載力量測----------------------- 38
4.5.3 鋼筋應變計量測---------------------------------- 39
4.5.4 沉陷變化觀測------------------------------------ 39
4.6 試驗之迴歸分析---------------------------------- 40
4.6.1 充氣式浮力基礎迴歸分析--------------------------- 41
4.7 尺寸效應--------------------------------------- 44
4.8 充氣式浮力基腳承載力試驗尺寸效應調整(系統誤差調整) 44
4.9 充土式浮力基礎迴歸分析--------------------------- 46
4.10 充土式浮力基腳承載力試驗尺寸效應調整(系統誤差調整) 49
4.11 充氣式、充土式浮力基腳之理論公式整理--------------- 49
4.12 浮力基腳上下層鋼筋支應力比較---------------------- 50
4.13 模型試驗結果與討論------------------------------- 52
4.14 浮力基腳的應用---------------------------------- 54
第五章 結論與建議---------------------------------------------- 55
5.1 結論--------------------------------------------------- 55
5.2 建議--------------------------------------------------- 56
參考文獻 ------------------------------------------------------- 57
附錄一 ------------------------------------------------------- 153
自傳 --------------------------------------------------------- 310
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