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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 黃良雄 | |
dc.contributor.author | Hsin-Yu Chang | en |
dc.contributor.author | 張芯瑜 | zh_TW |
dc.date.accessioned | 2021-06-16T17:50:32Z | - |
dc.date.available | 2015-08-19 | |
dc.date.copyright | 2012-08-19 | |
dc.date.issued | 2012 | |
dc.date.submitted | 2012-08-13 | |
dc.identifier.citation | [1] Bear, J., Dynamics of Fluids in Porous Media, Dover, 1972.
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O'Donnell., “Wave-Induced Forces on Buried Pipelines in Permeable Seabeds,” In Civil Engineering in the Oceans IV, 1979. [25] Lucassen, R.J., “Scour Underneath Submarine Pipelines,” M.S. thesis, Delft University of Technology, 1984. [26] MacPherson, H., “Wave-Forces on Pipeline Buried in Permeable Seabed,” Journal of the Waterway Port Coastal and Ocean Division-Asce, Vol. 104 (4), pp. 407-419, 1978. [27] Magda, W., “Wave-Induced Pore Pressure Distribution in Sandy Seabed Sediments,” Ph.D. Thesis, Technical University of Gdansk, 1992. [28] McDougal, W. G., S. H. Davidson, P. L. Monkmeyer, and C. K. Sollitt., “Wave-Induced Forces on Buried Pipelines,” Journal of Waterway Port Coastal and Ocean Engineering-Asce, Vol. 114(2), pp. 220-236, 1988. [29] Moncada-M, A. T., and J. Aguirre-Pe., “Scour Below Pipeline in River Crossings,” Journal of Hydraulic Engineering-Asce, Vol. 125(9), pp. 953-958, 1999. [30] Murray, R. S., Liu John, and Lipschutz Seymour, Mathematical Handbook of Formulas and Tables, 1999. [31] Putnam, J. A., “Loss of Wave Energy Due to Percolation in a Permeable Sea Bottom,” Transactions of the American Geophysical Union, Vol. 30(3), pp. 349-357, 1949. [32] Smith, H. D., and D. L. Foster., “Modeling of Flow around a Cylinder over a Scoured Bed,” Journal of Waterway Port Coastal and Ocean Engineering-Asce, Vol. 131(1), pp. 14-24, 2005. [33] Sumer, B. M., and J. Fredsoe., “Scour Below Pipelines in Waves,” Journal of Waterway Port Coastal and Ocean Engineering-Asce, Vol. 116(3), pp. 307-323, 1990. [34] Sumer, B. M., C. Truelsen, and J. Fredsoe., “Liquefaction around Pipelines under Waves,” Journal of Waterway Port Coastal and Ocean Engineering-Asce, Vol. 132(4), pp. 266-275, 2006. [35] Sumer, B. M., C. Truelsen, T. Sichmann, and J. Fredsoe., “Onset of Scour Below Pipelines and Self-Burial,” Coastal Engineering, Vol. 42(4), pp. 313-335, 2001. [36] Talebbeydokhti, N., and E. Afzali., “Wave Induced Uplift Forces Acting on Half-Buried Submarine Pipeline in Sandy Seared by Numerical Methods,” Iranian Journal of Science and Technology Transaction B-Engineering, Vol. 32(B2), pp. 141-151, 2008. [37] 方銘川, “水下載具應用於海底管線檢修之關鍵技術研發”,2007。 [38] 張正緯, “水平分區、垂直分層之三維地下水計算”,國立台灣大學碩士論文,民國98年。 [39] 韓艷,“海底管線的沖刷與導流防護技術研究”,中國海洋大學博士論文,民國99年。 | |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/64494 | - |
dc.description.abstract | 近年來,關於海底管線因底床沖刷而懸空造成破壞的報導層出不窮,例如:2000年,台灣首座海底管線,中油鋪設永安液化天然氣海底輸送管線工程;2007年,進行永安至通霄海底輸氣管線量測作業,發現多處管線祼露、懸空,必須花費許多人力物力,進行管線補救措施以避免其斷裂破壞,因此瞭解海底管道失效的原因,將有助於找到解決海底管線失效問題的有效方法。
於張正緯(2009)之研究中,認為地下水流經過結構物角狀構造邊緣,水流流速急遽增加,將發生管湧(piping)現象,進而破壞結構物;其研究亦證實透水性佳之建材可使地下水流較不易受到阻礙,減緩水流之速度向量。本研究認為海床底質遭到沖刷之原因,亦與管湧現象有關,文中利用邊界元素法模擬水流流經多孔介質底床上圓管之流況與速度、壓力分佈,以瞭解管線週遭發生沖刷前的物理機制。 本研究之理論係以線性勢流理論與達西定律分別探討純水體與多孔介質之流場,文中假設流體皆為非黏性、非旋性及不可壓縮,多孔介質則簡化為剛性結構;因水體與多孔介質流體間之邊界條件量階差異過大,故本文利用正規擾動展開法解決數值計算上可能產生之矩陣劣化(ill condition)現象。 由模擬結果可發現,底床上放置圓管將影響底床之流場,進而使圓管與底床接觸面孔隙流體流速增大,以致產生管湧現象使管線懸空。本研究設計一概念模型,於圓管外側包覆一透水層進行模擬,模擬結果顯示無論何種流況下,透水層皆能使水流較不受結構物阻礙,並大幅降低底床中圓管外側之速度向量大小,應可有效減緩圓管周遭之管湧效應,進而根本上防止管線之懸空斷裂情形,故文末建議日後設計管線時,可利用透水性佳之建材包覆於圓管外層,減緩因放置圓管所產生之管湧現象,將可望節省大量修繕之經費。 | zh_TW |
dc.description.provenance | Made available in DSpace on 2021-06-16T17:50:32Z (GMT). No. of bitstreams: 1 ntu-101-R99521303-1.pdf: 11348801 bytes, checksum: 28cbdce2c0720598f4c40ff76ccfb8f2 (MD5) Previous issue date: 2012 | en |
dc.description.tableofcontents | 中文摘要 i
ABSTRACT ii 目錄 iii 圖目錄 v 表目錄 x 符號說明 xi 第 一 章 導論 1 1.1 研究動機與目的 1 1.2 文獻回顧 3 1.3 研究內容與方法 7 1.4 章節介紹 7 第 二 章 底床上圓管管湧作用模式建立 9 2.1 管湧作用形成之驅動機制 9 2.2 底床上圓管管湧作用之邊界值問題 9 2.2.1 控制方程式 10 2.2.2 邊界條件 12 2.2.3 邊界值問題之建立 13 2.3 底床上圓管管湧作用問題之正規擾動法 18 2.3.1 擾動展開尺度函數之探討 19 2.3.2 正規擾動法展開之邊界值問題 20 第 三 章 數值方法 25 3.1 邊界積分式理論及推導 26 3.2 線性元素之建立 27 3.3 數值積分 – 高斯積分 29 3.4 二維Laplace方程式之線性邊界元素法 29 3.5 多孔介質透水區邊界積分聯立方程式之推導 34 3.6 數值模式之測試例 37 第 四 章 數值模式之應用 42 4.1 理論之限制條件 42 4.2 模式之建立 43 4.3 均勻流流經底床上圓管之模型模擬 45 4.4 週期性震盪流流經底床上圓管之模型模擬 63 4.5 各項物理參數對管湧作用減緩之影響 83 第 五 章 結論與建議 92 5.1 結論 92 5.2 建議 93 參考文獻 94 | |
dc.language.iso | zh-TW | |
dc.title | 底床上圓管管湧現象之減緩方法 | zh_TW |
dc.title | The Mitigation Method for the Piping Effect Around a Pipe on the Bed | en |
dc.type | Thesis | |
dc.date.schoolyear | 100-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 蕭士俊,曾鈞敏,林孟郁 | |
dc.subject.keyword | 水底管線,管湧現象,邊界元素法, | zh_TW |
dc.subject.keyword | underwater pipeline,piping effect,boundary element method, | en |
dc.relation.page | 97 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2012-08-14 | |
dc.contributor.author-college | 工學院 | zh_TW |
dc.contributor.author-dept | 土木工程學研究所 | zh_TW |
顯示於系所單位: | 土木工程學系 |
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