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姓名 周正倫(Jheng-Lun Chou) 查詢紙本館藏 畢業系所 土木工程學系 論文名稱 凝聚性沉泥沈降至壓密之壓力實驗分析
(An Employing Pore Pressure Experimental Analyze forCohesive Sediment Settling and Consolidation)相關論文 檔案 [Endnote RIS 格式] [Bibtex 格式] [相關文章] [文章引用] [完整記錄] [館藏目錄] [檢視] [下載]
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摘要(中) 摘要
凝聚性沉泥(淤泥)常在水庫、湖泊、出海口處形成淤積。民國93年8月,艾莉颱風造成石門水庫原水濁度過高,使桃園地區民生供水遭受重大危機。本研究將採用石門水庫淤泥樣本,以不同高度沈降管進行沈降實驗,並以簡易的測壓管進行壓力實驗,來量測其阻礙沈降至壓密的水頭高度變化,探討超額水壓的變化過程,最後將沈降、壓力實驗結果與前人實驗、理論之結果相互比較,期望能瞭解淤泥在沈降、壓密的過程中所呈獻的物理行為。
實驗結果顯示,重量濃度在8%以上屬於凝聚性沈降,且不同的濃度會有不同的沈降行為。在沈降過程中,當底部有沉泥沈積時,即開始有壓密的作用產生,使超額水壓轉化為有效應力。濃度在40%時有明顯的microventing情形發生,導致超額水壓先上升再消散。濃度20%、24%、30%壓密時的超額水壓消散情形與前人理論比較結果相符。摘要(英) ABSTRACT
Cohesive sediment usually deposits in reservoir, in lakes, and at estuary. The sampled mud in Shihmen Reseroir was used in this study with settling columns of different heights to perform settling measurement. Pore pressure measurements were conducted to examine the relaxation process of excessive pore pressure. The results of the settling and pressure measurement were compared with the consolidation experiments and theories of Been and Sill.
When the weight concentration of mud is above 8%, it belongs to cohesive settling. Further, different concentrations have distinct effects on settlings. When the concentration of mud reaches 40%, the significant microventing causes the excess pore pressure to rise at first then dissipate later. While the concentration is between 20%-30%, the dissipations of excessive pore pressure agrees with the consolidation theories of Been and Sills.關鍵字(中) ★ 凝聚性沉泥
★ 沈降
★ 超額孔隙水壓
★ 壓密關鍵字(英) ★ settling
★ cohesive sediment
★ excess pore pressure
★ consolidation論文目次 目錄
頁次
摘要 I
ABSTRACT II
目錄 III
圖目錄 VI
表目錄 VIII
符號表 IX
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 本文架構 2
第二章 文獻回顧 4
2-1 凝聚性沉泥性質 4
2-2 凝聚性沉泥沈降與壓密 6
2-3 Microventing 14
第三章 理論分析 16
3-1顆粒沈降速度 16
3-1-1 Stoke’s Law 16
3-1-2 阻礙沈降速度 17
3-2 沈降濃度變化 18
3-3 Been and Sills自重壓密理論 21
第四章 實驗配置及方法 27
4-1 實驗目的 27
4-2 實驗設備 27
4-3 實驗參數 29
4-4 實驗條件 30
4-5 實驗配置 31
4-6 實驗步驟 32
4-6-1 沈降實驗 32
4-6-2 壓力實驗 32
第五章 結果與討論 34
5-1 粒徑分佈 34
5-2 沈降實驗 34
5-3 壓力實驗 35
5-3-1 濃度8% 36
5-3-2 濃度13% 37
5-3-3 濃度20% 37
5-3-4 濃度24% 38
5-3-5 濃度30% 38
5-3-6 濃度40% 39
5-4 MICROVENTING 40
5-5 理論與實驗結果比較 40
5-5-1 阻礙沈降速度 40
5-5-2 Work and Kohler沈降曲線模擬 41
5-5-3 超額水壓消散模擬結果 42
第六章 結論與建議 66
6-1 結論 66
6-2 建議 67
參考文獻 68參考文獻 參考文獻
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16. Yigong Li and Ashish J. Mehta,“Assessment of Hindered Settling of Fluid Mudlike Suspension”,Journal of Hydraulic Engineering,pp.176~178,February,1998。指導教授 周憲德(Hsien-Ter Chou) 審核日期 2005-7-18 推文 facebook plurk twitter funp google live udn HD myshare reddit netvibes friend youpush delicious baidu 網路書籤 Google bookmarks del.icio.us hemidemi myshare