土壤液化引致地盤永久位移之研究

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吳俊逸(Jian-Yi Wu) 查詢紙本館藏

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土木工程學系

論文名稱

土壤液化引致地盤永久位移之研究

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摘要(中)

具破壞性之地變型態。以九二一集集大地震為例，台中港碼頭區、貓
羅溪堤防、南投縣霧峰鄉旱溪河岸太子城堡社區及彰化縣員林鎮等地
區皆因土壤液化所引致的地盤位移而產生嚴重的破壞。因此針對此高
危險性之破壞形態，實有必要加以深入研究。
Newmark (1965)滑塊模式為工程實務上最常用的地盤變位分析
方法，其中假設滑動土體為剛性體，此剛性體在一平面上滑動。於地
震作用過程中，當地震所產生之加速度超過土體之降伏加速度時，使
得土體慣性力大於滑動阻抗力，因而產生下坡方向之地盤永久位移，
其大小可由塊體對破壞面之相對加速度經兩次積分後求得。
在應用Newmark滑塊模式時，有一項非常重要的參數必須確定，
此參數即是不排水剪力強度(Su)。本研究於液化場址取得液化土樣，
並採溼搗法製作重模土體以進行三軸壓密不排水剪力強度試驗(CIU
test)，待獲得Su 後，即可求得降伏加速度，再利用相對運動之觀念，
進一步得到地盤之側向流動永久位移。
針對九二一集集大震，台灣發生液化地區進行現地取樣，經由一
系列室內試驗瞭解液化土壤之基本性質與強度特性，藉由Newmark
滑塊理論推估永久位移量，與現地量測之位移值作一比較，結果顯示
Newmark 滑塊理論之適用性良好，唯須注意現地地形之量測所造成
之誤差。上述研究之成果可進一步建立台灣本土之土壤液化所引致地
盤永久位移之資料，爾後供作防災、救災之參考。

摘要(英)

Liquefaction induced permanent horizontal displacement is one of
the most destructive ground failures during strong earthquake. During
Chi-Chi earthquake, severe damage as caused by permanent horizontal
displacement induced by soil liquefaction in many areas. Therefore, it
becomes very important to predict the permanent displacement with a
degree of reasonable accuracy to provide a reference for hazard
prevention.
This study documented and mapped the case histories of lateral
spreading occurred during Chi-Chi earthquake. The liquefied soils were
remolded and tested to obtain the steady-state strength by the triaxial
undrained test. Relationships between normalized steady-state strength
and relative density Dr or normalized standard penetration value (N1)60
were established for four kinds of liquefied soils. Newmark’s rigid block
sliding model is used to estimate the permanent horizontal displacement
with the steady-state strength parameter obtained from laboratory . It was
found that the estimated displacements are in acceptable agreement with
those measured in the field after earthquake.

論文目次

摘要...................................................................................................... I
英文摘要............................................................................................ Ⅱ
目錄................................................................................................... IV
圖目錄.............................................................................................. VII
表目錄............................................................................................... XI
第一章緒論........................................................................................ 1
1.1 研究背景...............................................................................1
1.2 研究目的...............................................................................2
第二章文獻回顧................................................................................ 5
2.1 Newmark 滑動模式................................................................5
2.1.1 基本假設與分析模型...................................................5
2.1.2 永久水平位移計算.......................................................6
2.2 最小勢能法模式....................................................................7
2.2.1 基本假設與分析模型...................................................7
2.2.2 永久水平位移計算.......................................................8
2.2.3 永久水平位移之閉合解.............................................13
2.3 有限元素動態模式模式.......................................................14
2.4 經驗模式.............................................................................15
2.4.1 液化嚴重指標(Liquefaction Severity Index,LSI)..........15
V
2.4.2 Hamada 經驗法..........................................................17
2.5 綜合評述.............................................................................18
第三章室內試驗方法與結果分析.................................................... 24
3.1 試驗目的.............................................................................24
3.2 試驗內容.............................................................................24
3.3 試驗方法.............................................................................25
3.4 試驗儀器與相關之設備.......................................................25
3.4.1 篩分析與比重計試驗儀器..........................................26
3.4.2 阿太堡塑性限度試驗.................................................26
3.4.3 實驗室三軸壓縮試驗系統..........................................27
3.5 試驗土樣與試體準備..........................................................29
3.6 試驗步驟.............................................................................30
3.7 試驗數據處理......................................................................32
3.8 試驗結果分析與應用..........................................................33
3.8.1 建立土體之臨界狀態線.............................................33
3.8.2 殘餘剪力強度(Residual Shear Strength)之選取與應用33
第四章Newmark 滑塊模式數值程式之發展與驗證........................ 59
4.1 Newmark 滑動塊模式...........................................................60
4.1.1 降伏加速度(ay)與不排水剪力強度(Su) .......................60
4.2 數值程式之發展..................................................................62
4.3 數值程式之驗證..................................................................64
4.3.1 地震波為三角型之輸入驗證......................................65
4.3.2 地震波為正弦型之輸入驗證......................................66
4.4 結語.....................................................................................67
第五章側向流動案例分析............................................................... 73
5.1 貓羅溪沿岸液化土壤描述...................................................73
5.2 貓羅溪沿岸側向流動分析...................................................74
5.2.1 原始流動剖面之建立.................................................75
5.2.2 應用STABL5M 預估破壞面之ay 值..........................75
5.2.3 地震加速度資料之處理.............................................76
5.3 案例分析結果與現地量測資料之比較................................77
第六章結論與建議.......................................................................... 97
6.1 結論.....................................................................................97
6.2 建議.....................................................................................98
參考文獻..........................................................................................100
附錄一..............................................................................................105

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指導教授

黃俊鴻(Jing-Hung Hwang)

審核日期

2000-7-20

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