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研究生:吳皇儀
研究生(外文):Huang-Yi Wu
論文名稱:台東至北呂宋間的弧前構造數值模擬
論文名稱(外文):
指導教授:王維豪
指導教授(外文):Wei-Hau Wang
學位類別:碩士
校院名稱:國立中正大學
系所名稱:地震研究所暨應用地球物理研究所
學門:自然科學學門
學類:地球科學學類
論文種類:學術論文
論文出版年:2006
畢業學年度:94
語文別:中文
論文頁數:84
中文關鍵詞:莫爾-庫倫屈服準則馬尼拉海溝海槽海脊板塊隱沒數值模擬
外文關鍵詞:Mohr-Coulomb theorymanila trenchtrohghridgesubduction platenumerical simulation
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台灣東南部處於歐亞大陸與菲律賓海板塊的聚合帶上,在北緯20至23度,東經120至122度之間存在數個南北走向的海槽與海脊(恆春海脊、南縱海槽、花東海脊、台東海槽、北呂宋海槽)。這些海槽與海脊的成因不只是單純的弧陸碰撞擠壓就能造成,本文認為呂宋島弧的弧前增積楔形體往北延伸成恆春海脊時,其岩性的強度逐漸增加,這種岩體強度的南北差異,控制本區域地質構造的發展。為進一步定量分析此因素所可能造成的影響。本文以ABAQUS所提供之有限元素法進行數值模擬。研究結果顯示:
1.當呂宋島弧西側岩化與未岩化的增積楔形體的楊氏係數對比達10倍時,雙海槽(南縱海
槽和台東海槽)即會形成,若缺乏此強度對比則只有單一海槽(北呂宋海槽)。
2.增積楔形體岩化的部分,從等壓力線推論其形狀為半橢圓形,而在其東翼靠島弧側的前
緣即為之後海脊隆起的位置。
3.北呂宋海槽以北形成南北走向的南縱海槽、台東海槽,在南縱海槽右側的花東海脊向南
延伸時,可能因增積楔形體岩化程度減小而將南縱海槽封閉起來,與實際觀察結果相符
合。
4.利用ABAQUS的後處理分析,可以發現在南縱海槽及恆春海脊附近的 接近水平而 接近垂
直,構造以逆衝斷層的形式為主;在台東海槽與北呂宋海槽的交接處, 為接近垂直,因
此構造型態為走向滑移斷層的形式,與實際觀測資料符合。
5.在增積楔形體南北岩化交界處和雙海槽及單海槽交界處的走向滑移斷層之位置,其最大
主應力方向可以解釋右移斷層的位置及走向;在台東海槽(北緯22.3度和北緯22度處)
模擬的最後應力方向也符合實際上左移斷層的位置及走向。
誌謝 ........................................................ I
摘要 ........................................................ II
目錄 ........................................................ IV
圖目 ........................................................ VI
表目 ........................................................ IX
第一章 緒論 ............................................... 1
1-1 研究動機與目的 ....................................... 1
1-2 台灣東南海域地質構造 ................................. 11
第二章 研究方法與數值模型 ................................ 16
2-1 簡介有限元素法 ....................................... 16
2-2 模型材質的流變行為.................................... 20
2-3 數值模型.............................................. 23
2-4 二維均質模型 ......................................... 23
2-4-1 模型建置 ...................................... 23
2-4-2 材料參數之選取 ................................ 24
2-4-3 邊界條件 ...................................... 24
2-5 二維非均質模型 ....................................... 29
2-5-1 模型建置 ...................................... 29
2-5-2 材料參數之選取 ................................ 29
2-5-3 邊界條件 ...................................... 29
2-6 三維非均質模型 ....................................... 35
2-6-1 模型建置 ...................................... 35
2-6-2 材料參數之選取 ................................ 36
2-6-3 邊界條件 ...................................... 36
第三章 模擬結果 .......................................... 41
3-1 二維均質模型結果 ..................................... 41
3-1-1 變形結果 ......................................... 41
3-1-2 應力結果 ......................................... 41
3-2 二維非均質模型結果 ................................... 44
3-2-1 變形結果 ......................................... 44
3-2-2 應力結果 ......................................... 44
3-2-3 模擬參數敏感度分析 ................................ 44
3-3 三維非均質模型結果 ................................... 53
3-3-1 變形結果 ......................................... 53
3-3-2 應力結果 ......................................... 53
3-3-3 模擬參數敏感度分析 ............................... 54
3-3-4 主應力值變化 ..................................... 55
第四章 討論 .............................................. 70
第五章 結論 .............................................. 80
參考文獻 .................................................... 81
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