位於可液化砂土層中單樁基礎受震反應的離心模擬

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凃亦峻(Yi-chun Tu) 查詢紙本館藏

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土木工程學系

論文名稱

位於可液化砂土層中單樁基礎受震反應的離心模擬
(Centrifuge modeling on the Seismic Response of Mono-pile Foundations in Liquefiable Sandy Soil Subjected to Earthquake Loading)

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摘要(中)

台灣雖然擁有豐富的風資源，但東海岸地形陡峭，並不適合發展離岸風力發電，因此風力發電設施多設置於西部沿海。然而西岸海底表層多屬於疏鬆砂土，地震時淺層砂土發生液化的可能性相當高，而國外目前對位於地震區的離岸風力電廠，其風力發電機組之基礎土壤發生液化對基礎穩定的評估方法尚無深入研究。本研究以離心模型試驗探討單樁基礎土壤液化時，單樁基礎的受震反應。
本研究以丹麥離岸風力發電機組(Horns Rev 1)之單樁基礎為原型，先將原型尺寸折減為40%，再依據尺度定律將折減後的單樁基礎縮尺，設計製作八十分之一的單樁基礎模型，在80g的離心加速度場進行試驗。離心模型試驗過程分別量測樁身彎矩歷時、加速度歷時、樁頂位移歷時與地表沉陷，並利用回歸分析求取單樁樁身彎矩分佈隨時間的變化。
試驗結果顯示，基樁受震時，乾砂試體最大彎矩量發生在深度4m(z/L=0.21)處，飽和砂試體最大彎矩量發生在深度6.4m(z/L=0.33)處，顯示淺層土壤液化時，土層束制基樁的深度會向深層發展。而當基樁上部載重塊的高度越高，由於基樁受震時上部載重產生的傾覆彎矩較大，因此樁身產生的彎矩量以及樁頭位移量較大。此外利用p-yΔ曲線法計算地盤反力係數kh，其結果顯示飽和砂試體淺層土層在超額孔隙水壓比ru值最大時kh接近最小值，深層土壤整體而言kh隨著振動週期數的增加而增加。

摘要(英)

Offshore wind farms have recently been developed very maturely in Northern European country. Although the wind energy resource in the western coastline of Taiwan is very abundant, the offshore wind power industry has not been developed. Taiwan is located in the seismic zone, and the sea bed in the western coastline of Taiwan is deposited with very loose sandy soil that may be liquefied during large earthquakes. The current design code of wind turbine foundation does not give the detailed requirements of earthquake resistant design. And thus, a design guideline or code which proved by centrifuge modeling tests is strongly needed before construction projects undertaking. The research results will give the reference to the mono-pile for offshore wind turbines.
In this study, a series of dynamic shaking table tests of mono-pile foundations was conducted for the centrifuge pile models embedded in liquefiable sandy soil and carried out at an 80-g acceleration. According to the test results the fallowing findings were obtained. The maximum bending moment of pile in dry sand occurred at the depth of 4m (z/L=0.21) and the maximum bending moment of pile in saturated liquefiable sand occurred at the depth of 6.4m (z/L=0.33). The induced bending moment and the pile displacement are higher when the tip mass fixed on the top of the mono-pile foundations. The coefficient of horizontal subgrade reaction can be calculated by p-yΔ curve method. The values of the coefficient of horizontal subgrade reaction in shallow depths decrease while the excess pore water pressure increase during shaking. In the case of deep soil, the values of coefficient of horizontal subgrade reaction increase with the increasing number of cycles of shaking. And the coefficient of horizontal subgrade reaction suggested by Reese consist with the experimental results.

關鍵字(中)

★ 單樁基礎
★ p-yΔ曲線法
★ 超額孔隙水壓比
★ 地盤反力係數
★ 液化
★ 模型計測樁

關鍵字(英)

★ excess pore water pressure
★ p-yΔ curve method
★ coefficient of horizontal subgrade reaction
★ mono-pile foundation

論文目次

摘要 i
ABSTRACT ii
誌謝 iii
目錄 iv
表目錄 vii
圖目錄 viii
符號說明 xiii
第一章緒論 1
1-1 前言 1
1-2 研究動機與目的 1
1-3 研究方法 2
1-4 論文架構 2
第二章文獻回顧 3
2-1 土壤液化現象以及發生機制 3
2-1-1 何謂土壤液化 3
2-1-2 土壤液化的發生機制 4
2-2 基樁受震的相關研究 5
2-2-1 振動台試驗 5
2-2-2 離心振動台實驗 6
2-3 基樁水平載重相關研究 7
2-4 Winkler梁在彈性基礎之分析模式 8
2-5 美國石油協會建議之p-y曲線 9
2-6 土層的彈性模數 9
2-7 國內設計規範 10
2-8 離心模型基本原理 10
2-7-1 離心模型的基本相似律 11
2-7-2 科氏加速度的影響 13
2-7-3 模型模擬的觀念 13
第三章試驗設備與試驗方法 26
3-1 試驗儀器與相關設備 26
3-1-1 地工離心機 26
3-1-2 振動台控制系統與資料擷取系統 26
3-1-3 移動式霣降儀 27
3-1-4 積層版試驗箱 27
3-1-5 模型計測樁 28
3-1-6 相關感測器 28
3-2 試驗土樣 29
3-3 試體準備 29
3-3-1 試驗箱組立 29
3-3-2 安裝模型樁 30
3-3-3 試體土樣準備 30
3-3-4 試體土樣飽和 31
3-4 試驗步驟 31
第四章試驗結果與分析 43
4-1 試驗條件 43
4-2 升g過程造成的變量 44
4-2-1 相對密度變化 44
4-2-2 樁身撓曲彎矩變化 44
4-3 振動事件造成的變量 45
4-3-1 試體沉陷量變化 45
4-3-2 試體加速度歷時變化 45
4-3-3 試體超額孔隙水壓歷時以及超額孔隙水壓比歷時變化 46
4-3-4 樁身撓曲彎矩歷時變化 46
4-4 利用回歸曲線推求單樁彎矩分佈 48
4-4-1 回歸分析 50
4-4-2 乾砂試體樁身彎矩分佈 52
4-4-3 飽和砂試體樁身彎矩分佈 54
4-4-4 乾砂試體樁身位移分佈 57
4-4-5 飽和砂試體樁身位移分佈 58
4-5 試體最大樁身彎矩量與樁身水平位移量 61
4-5-1 樁基礎之撓曲彎矩量 61
4-5-2 樁基礎之水平位移量 61
4-6 影響樁基礎受震反應的因子 63
4-6-1 上部載重之加速度歷時 63
4-6-2 樁頂之位移歷時 63
4-6-3 積層版箱的側向位移歷時 64
4-7 利用轉換函數探討單樁與土層的頻率 64
4-8 水平地盤反力係數 65
4-8-1 土層位移量 65
4-8-2 地盤反力係數分析 65
4-8-3 地盤反力係數值 66
4-8-4 本研究之kh值與API建議的砂土p-y曲線比較 67
4-8-5 基樁的變形類型 67
第五章結論與建議 179
5-1 結論 179
5-2 建議 180
參考文獻 181
附錄A 單樁離心縮尺模型設計 184

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指導教授

李崇正(Chung-Jung Lee)

審核日期

2011-8-22

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