基樁負摩擦力之模型試驗

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姓名

謝依航(Yi-Hang Hsien) 查詢紙本館藏

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土木工程學系

論文名稱

基樁負摩擦力之模型試驗
(A Model Test for Measuring Downdrag Behavior of a Pile in a Clay Layer)

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摘要(中)

本研究規劃設計一套可以改善長期溫度效應，直接觀測基樁負摩擦力之模型試驗，利用模型計測樁來探討壓密沉陷對基樁負摩擦力之影響，以及壓密完成後負摩擦力是否會發生變化。在模型樁受力同時，藉由模型計測樁內之應變規量測模型樁體受力反應，配合樁尖及樁頂之荷重計讀數，可求得模型樁在不同深度之受力，進而推算樁身表面負摩擦力，並以此為依據，探討基樁負摩擦力之行為。由試驗結果得知，負摩擦力之歷時曲線與土壤壓密之歷時曲線相似，其生成主要集中在主要壓密階段，之後隨時間趨於緩和。隨著覆土應力的增加，樁身之負摩擦力也會跟著增加。

摘要(英)

This paper presents a model pile test system which was designed to measure the negative friction behavior of a pile when its surrounding ground consolidated in multi-stage. The design overcame the temperature effect on the strain gauges which were pasted in the interior wall of the model pile, with an inner diameter of only 17mm by a half-bridge connection and a dummy model pile. The system has successfully measured the time dependent response of downdrag force of the pile. The time-dependent negative friction along the pile was deduced. The neutral point is at the location of 90% thickness of the compressible layer. The development of the downdrag force is closely related to the consolidation behavior of the compressible layer. The variation trends with time are almost the same for the downdrag force and the consolidation settlement. The negative frictions at the upper and lower parts of the compressible layer are larger than that of the middle part due to the larger consolidation rate at both ends of the layer.

關鍵字(中)

★ 模型試驗
★ 負摩擦力
★ 樁基礎
★ 壓密

關鍵字(英)

★ downdrag
★ negative skin friction
★ pile
★ consolidation
★ model test

論文目次

摘要...................................................I
ABSTRACT...............................................II
目錄.................................................III
圖目錄................................................V
表目錄...............................................IX
第一章緒論............................................1
1-1 前言................................................1
1-2 研究動機與目的......................................2
1-3 研究方法與流程......................................2
1-4 論文架構............................................3
第二章文獻回顧.........................................4
2-1 基樁與土壤間之摩擦性質..............................4
2-2 負摩擦力發生之機制.................................11
2-3 基樁負摩擦力之估計.................................12
2-3-1 中立點位置.......................................12
2-3-2 單樁負摩擦力之推求...............................15
2-4 前人基樁負摩擦力之研究.............................22
2-4-1 現場量測法.......................................22
2-4-2 室內模型試驗法...................................23
2-4-3 數值分析法.......................................27
第三章單樁負摩擦力模型試驗............................31
3-1 試驗規劃與設計.....................................31
3-2 試驗土樣...........................................31
3-3 試驗儀器與相關設備.................................32
3-3-1 移動式霣降機.....................................33
3-3-2 大型壓密儀與模型試驗箱...........................33
3-3-3 模型計測樁.......................................38
3-3-4 荷載施加設備.....................................46
3-4 各式感應器之校正...................................53
3-5 溫度效應...........................................58
3-5-1 溫度量測.........................................59
3-5-2 溫度效應的改善...................................61
3-6 試驗方法...........................................64
3-6-1 試體製作.........................................64
3-6-2 模型樁之負摩擦力試驗.............................70
第四章試驗結果與分析..................................72
4-1 模型樁貫樁及靜置過程之受力反應.....................72
4-2 分階施加覆土應力下之土壤壓密與基樁負摩擦力.........74
4-3 分階壓密對基樁軸力之影響...........................80
4-4 分階壓密對基樁摩擦力之影響.........................90
4-5 綜合分析與討論.....................................99
第五章結論與建議.....................................102
5-1 結論..............................................102
5-2 建議..............................................103
參考文獻..............................................104

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指導教授

黃俊鴻(Jin-Hung Hwang)

審核日期

2006-11-21

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