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研究生:吳珮如
研究生(外文):Pey-RuWu
論文名稱:以動態模型試驗探討液化土層中錨碇板樁之反應
論文名稱(外文):The Study of Anchored Sheet Pile Responses in Liquefied Soil by Dynamic Model Test
指導教授:張文忠張文忠引用關係
指導教授(外文):Wen-Jong Chang
學位類別:碩士
校院名稱:國立成功大學
系所名稱:土木工程學系碩博士班
學門:工程學門
學類:土木工程學類
論文種類:學術論文
論文出版年:2012
畢業學年度:100
語文別:中文
論文頁數:110
中文關鍵詞:錨碇板樁土壤液化土壤結構互制行為實體模型動態試驗
外文關鍵詞:Anchored sheet pileSoil liquefactionSoil-structure interactionDynamic model test
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本研究使用震動台與雙軸向層狀剪力盒進行錨碇板樁實體模型動態試驗,以探討液化土層中錨碇板樁之行為。試驗以鋁板作為錨碇板樁之主樁,以乾淨砂作為砂土試體置入雙軸向層狀剪力盒中,以由下至上傳遞之正弦波為輸入地震,擷取震動過程中砂土試體之超額孔隙水壓力與質點加速度,並量測主樁彎曲應變與側向位移,以主樁彎曲應變計算主樁承受之側向土壓、剪力、彎矩與側向彈性位移。透過資料歷時分析與繪製動態p-y曲線了解錨碇板樁土壤結構互制行為,發現液化過程中主樁周圍砂土因超額孔隙水壓力激發而出現軟化現象,試驗結束時錨碇板樁模型因砂土液化而發生傾倒破壞。試驗結果與擬靜態分析比較發現,在砂土未液化與液化狀態下,擬靜態分析之側向土壓與彎矩皆大於試驗結果,顯示擬靜態分析較為保守。
To study the anchored sheet pile responses in liquefied soil, a dynamic model test of anchored sheet pile by using shaking table and biaxial laminar shear box was performed. Sheet pile wall model fabricated with aluminum plate was embedded in saturated, clean sand inside a biaxial laminar shear box on a shaking table. Series of up-propagation sinusoid vibration were applied by shacking table. Excess pore water pressure, soil particle acceleration, lateral displacement and bending strain of sheet pile wall were measured in the dynamic test. Furthermore, the lateral earth pressure, shear force, bending moment acted on the sheet pile wall, and lateral elastic deflection of sheet pile wall were derived from bending strain. Time histories of recorded data and dynamic p-y curve were employed to discuss the soil-structure interaction of anchored sheet pile. The results revealed that the soil soften phenomenon occurred around the sheet pile wall because of the excess pore water pressure generated during the liquefaction process and the model collapsed in the end of test. Comparisons of the results between physical model test and pseudo static analysis revealed that pseudo static analysis overestimated the induced lateral earth pressure and bending moment for both liquefied and nonliquefied conditions. Consequently, pseudo static analysis for current practice was conservative.
摘要 I
ABSTRACT II
誌謝 III
目錄 IV
表目錄 VII
圖目錄 VIII
第1章 緒論 1
1-1 研究背景 1
1-2 研究動機 2
1-3 研究方法與流程 2
1-4 論文架構 3
第2章 文獻回顧 5
2-1 土壤液化現象 5
2-2 擬靜態分析 6
2-3 錨碇板樁碼頭破壞案例與研究 7
2-3-1 錨碇板樁碼頭破壞模式 7
2-3-2 土壤液化現象對港灣結構物之影響 8
2-3-3 錨碇板樁碼頭損害程度預測 11
2-4 動態試驗回顧 13
2-5 土壤結構互制行為研究 18
第3章 錨碇板樁擬靜態分析與實體模型設計 21
3-1 擬靜態分析受力機制 21
3-1-1 背填土未液化 21
3-1-2 背填土部分液化 25
3-1-3 水位面下所有土層液化 26
3-2 錨碇板樁模型設計 27
3-2-1 設計方法 27
3-2-2 實體模型擬靜態分析 37
第4章 錨碇板樁實體模型動態試驗 44
4-1 試驗設備 44
4-1-1 雙軸向層狀剪力盒 44
4-1-2 錨碇板樁模型 46
4-1-3 大型砂土霣落箱 48
4-1-4 量測儀器與配置 49
4-2 試驗步驟 57
4-2-1 實體模型架設 57
4-2-2 量測儀器架設 58
4-2-3 砂土霣落與人工回填 59
4-2-4 試驗計畫 63
4-2-5 砂土沉陷量量測 64
第5章 試驗資料分析 67
5-1 試驗資料分析架構 67
5-2 試驗資料分析方法 69
5-2-1 位移計與加速度計資料分析 69
5-2-2 水壓計資料分析 69
5-2-3 微型單向加速度計資料分析 71
5-2-4 SAAR資料分析 71
5-2-5 應變計資料分析 73
第6章 結果與討論 75
6-1 震動台反應分析結果 75
6-2 累積超額孔隙水壓力分析結果 77
6-3 試體質點加速度分析結果 81
6-4 土壤結構互制行為 86
6-4-1 主樁與試體質點加速度比較 86
6-4-2 動態p-y曲線 89
6-5 試驗結果與擬靜態分析比較 93
6-6 主樁側向位移 101
第7章 結論與建議 104
7-1 結論 104
7-2 建議 105
參考文獻 106
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