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姓名 朱柏林(Po-Lin Chu) 查詢紙本館藏 畢業系所 土木工程學系 論文名稱 模型基樁於飽和竹南砂之靜態與循環軸向載重試驗
(Static and cyclic axial load tests of model pile in saturated Zhunan sand)相關論文 檔案 [Endnote RIS 格式]
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至系統瀏覽論文 (2028-7-10以後開放)
摘要(中) 離岸風機所處的沿海風向較陸地上的風機更穩定本研究僅探討軸向力對風機結構下部之樁基礎產生作用時，基樁土間產生軸向反覆作用力之力學行為，前人對樁土行為的研究指出，土壤經過循環載重作用之後，剪力強度可能有減小以及殘餘應變產生累積的情況，此稱之為反覆退化(cyclic degradation)現象。有些情況雖然會隨循環載重作用的過程累積殘餘應變，但土壤本身的強度卻反而會有增加的可能性，若有發生，則稱其為反覆硬化現象。另外，對於基樁承受循環載重之作用，基樁的極限承載力與樁頭 位移也有類似的現象，進而對承載力產生影響。
本研究製作模型樁，並改良前人設計之模型樁之加載及紀錄系統，在飽和砂土中進行靜態極限樁載重試驗，得到模型樁之靜態極限抗壓力，並由此施加靜態極限軸向加載以及多循環軸向加載試驗，及動態加載 (dynamic
並探討前人研究下反覆軸向載重試驗與吾人之結果差異。摘要(英) The offshore wind turbine is located in a more stable coastal wind direction than the land-based wind turbine. This study only investigates the mechanics of the axial forces acting on the lower pile foundation of the wind turbine structure and the axially reactive behavior of the pile soil.
Previous studies on pile soil behavior point out that after the soil is cyclically loaded, the shear strength may decrease and residual strain may accumulate, which is called the cyclic degradation. In some cases, the residual strain may accumulate during the cyclic loading process, but the soil strength itself may increase. In addition, for piles subjected to cyclic loading, there is a similar phenomenon in the ultimate load carrying capacity and pile head displacement, which affects the bearing capacity.
In this study, a scaled-down model pile was fabricated, and the loading and recording system of the model pile designed by the previous authors was improved to conduct a static limit loading test in saturated sandy soil to obtain the static limit resistance of the model pile. The differences between the results and those previous studies are also investigated.關鍵字(中) ★ 竹南砂
★ 模型基樁
★ 靜態軸向載重試驗
★ 循環軸向載重試驗
★ 樁頭載重位移
★ 殘餘軸力
★ tz曲線
★ Qz曲線
★ 樁土受力機制
★ 樁載重試驗
★ 樁頭載重與位移關係
★ 貫入試驗關鍵字(英) 論文目次 摘要................................................................................................................................. i
ABSTRACT ................................................................................................................... ii
致謝.............................................................................................................................. iii
目錄................................................................................................................................ v
圖目錄........................................................................................................................ viii
表目錄......................................................................................................................... xvi
第一章 緒論.................................................................................................................. 1
1-1 研究方法與內容................................................................................................. 3
1-2 論文架構............................................................................................................. 3
1-3 論文架構圖......................................................................................................... 4
第二章 文獻回顧...................................................................................................... 5
2-1 樁載重試驗......................................................................................................... 5
2-2 樁土受力機制..................................................................................................... 6
2-3 API 建議之t-z 曲線 .......................................................................................... 8
2-4 API 建議之Q-z 曲線 ........................................................................................ 9
2-5 樁基礎受反覆載重之文獻回顧....................................................................... 10
2-5-1 Jardine and Standing (2012) ....................................................................... 11
2-5-2 Merritt and Schroeder (2012)...................................................................... 16
第三章 試驗設備與試驗方法................................................................................ 20
3-1 試驗規劃與設計............................................................................................... 20
3-2 試驗砂樣以及基本性質................................................................................... 21
3-3 試驗儀器設備................................................................................................... 23
3-3-1 試體土槽.................................................................................................... 24
3-3-2 移動式空氣霣降儀.................................................................................... 25
3-3-3 載重施加裝置............................................................................................ 26
3-3-4 模型樁........................................................................................................ 28
3-3-5 雷射位移計................................................................................................ 35
3-3-6 樁頭荷重計................................................................................................ 36
3-3-7 恆溫及溫度檢測設備................................................................................ 40
3-3-8 飽和設備.................................................................................................... 42
3-3-9 資料處理系統............................................................................................ 43
3-3-10 在線式UPS系統 .................................................................................... 46
3-4 本研究之模型樁載重試驗方法....................................................................... 47
3-4-1 試體製作.................................................................................................... 47
3-4-2 靜態軸向極限載重試驗方法.................................................................... 49
3-4-3 多循環軸向載重試驗方法........................................................................ 49
3-4-4 多階段多週數試驗方法............................................................................ 50
第四章 試驗與結果討論........................................................................................ 51
4-1 試驗規畫與配置............................................................................................... 51
4-2 試體相對密度與貫入試驗結果....................................................................... 51
4-3 靜態軸向極限載重試驗結果........................................................................... 64
4-3-1 樁頭載重-位移曲線隨加載變化之討論 .................................................. 64
4-3-2 樁身軸力與樁身摩擦力隨加載變化之討論............................................ 73
4-3-3 樁底承載力變化之討論............................................................................ 93
4-4 多循環軸向載重試驗結果............................................................................... 98
4-4-1 載重與三種位移之關係圖...................................................................... 101
4-4-2 各階尖峰軸力與殘餘軸力圖.................................................................. 108
4-5 多階段多週數試驗結果................................................................................. 112
4-5-1 樁頭載重與位移關係及樁頭位移歷時圖.............................................. 115
4-6 綜合分析與討論............................................................................................. 119
4-6-1 試體製作及準備之討論.......................................................................... 119
4-6-2 MU試驗樁身摩擦力及樁底承載力之討論 ........................................... 120
vii
4-6-3 MU試驗各週數之殘餘位移之討論 ....................................................... 122
4-6-4 規劃外之多階段多週數試驗結果之討論.............................................. 124
第五章 結論與建議.............................................................................................. 127
5-1 結論................................................................................................................. 127
5-2 建議................................................................................................................. 129
第六章 參考文獻.................................................................................................. 130參考文獻 1. 周廷韋，「以離心模型試驗模擬基樁反覆抗壓及抗拉拔之行為」，碩士論
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131
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132
24. Tomlinson, M. J., Pile Design and Construction Practice, 4th edition, E & FN Spon, London (1970).
25. Winterkorn, H. F., and Fang, H. Y., Foundation Engineering Handbook, Van 221 Nostrand Reinhold Company, New York (1975).指導教授 黃俊鴻(Jun-Hong Huang) 審核日期 2023-8-11 推文 plurk
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