現地土壤之液化強度與震陷特性

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曾豊升(Feng-Sheng Tseng) 查詢紙本館藏

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土木工程學系

論文名稱

現地土壤之液化強度與震陷特性
(Liquefaction resistance and earthquake-induced settlement properties of the field soils)

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摘要(中)

本研究利用現地所取回之不擾動土樣進行一系列動力三軸試驗，用以探討現地土壤之液化強度與震陷特性。不擾動土樣包含薄管土樣與塊狀土樣兩種，以粉質砂土為主。此外，本文亦蒐集其他本土砂土之液化強度資料並與本研究試驗結果比較，發現砂土的液化強度範圍約SR20≒0.17~0.31。
本研究利用再壓密試驗結果探討現有三種液化後震陷評估法之關係圖表，並各依其程序探討集集地震所引致地盤沈陷之案例，以期工程界在選擇評估法時有所助益。

摘要(英)

In this paper, a series of undisturbed samples were carried out in a sandy deposit at central Taiwan. Laboratory physical tests and cyclic traxial tests were then conducted to obtain the basic properties, volumetric strain and cyclic resistance. The in-site samplings consisted of tube sampling during boring and block sampling in a pit. Besides, the others cyclic resistance of in-site undisturbed samples also was collected and compared with the outcome of this study. It was found that the scope of the cyclic resistance(SR20) of in-site sandy soil ranges between 0.17 and 0.31.
To investigate related charts suggested by three methods about estimation of earthquake-induced settlements in saturated sand deposits, the volumetric strain obtained from re-consolidation test would be analyzed with relative density and the maximum shear strain. These test data and conclusions may provide a valuable base for seismic design in a foundation soil with sandy soils.

關鍵字(中)

★ 粉質砂土
★ 土壤液化
★ 液化後沈陷
★ 液化強度

關鍵字(英)

★ post-liquefaction settlement
★ cyclic resistance
★ silty sand
★ soil liquefaction

論文目次

中文摘要 Ⅰ
英文摘要 Ⅱ
致謝 Ⅲ
目錄 Ⅳ
表目錄 Ⅶ
圖目錄 Ⅹ
符號說明 XI
第一章緒論 1
1.1 研究動機 1
1.2 研究目的 2
1.3 論文內容 2
第二章文獻回顧 3
2.1 液化後沈陷的機制 3
2.2 砂土之反覆阻抗(Cyclic Resistance)特性 4
2.2.1反覆軟化的定義(Cyclic softening) 4
2.2.2重模砂土之反覆阻抗 4
2.2.3現地砂土層之反覆阻抗 5
2.2.4粉質砂土之反覆阻抗 5
2.3 Tokimatsu and Seed(1987)簡易震陷評估法 6
2.3.1反覆剪應力比與(N1)60的估算 6
2.3.2相對密度與SPT-N值之轉換關係 8
2.3.3體積應變量之估算 8
2.4 Ishihara and Yoshimine(1992)液化後沈陷量評估法 9
2.4.1再壓密之體積應變量 9
2.4.2抗液化安全係數與最大剪應變之關係 10
2.4.3抗液化安全係數與液化後體積應變量之關係 10
2.4.4估算液化後地盤沈陷量之程序 11
2.5 Shamoto, Sato and Zhang(1996)簡易震陷評估法 12
2.5.1與先前研究比較 12
2.5.2砂土種類、邊界圍束與膨脹歷時對震陷評估之影響 13
2.5.3評估法程序 15
第三章試體準備與試驗方法 17
3.1 試體準備 17
3.1.1薄管土樣 17
3.1.2塊狀土樣 17
3.1.3重模土樣 17
3.2 試驗方法 18
3.2.1自然含水量與濕土單位重 18
3.2.2孔隙比 19
3.2.3顆粒粒徑分析試驗 19
3.2.4比重分析 19
3.2.5阿太堡限度(Atterberg Limits)試驗 19
3.2.6相對密度(Relative Density) 20
3.2.7動力三軸試驗儀器與周邊配備 20
3.2.8動態試驗步驟 24
第四章試驗結果與分析 29
4.1 試驗規劃 29
4.2 試驗結果 31
4.2.1基本物理性質試驗 31
4.2.2動力三軸試驗 33
4.3 試驗結果分析 35
4.3.1液化強度結果比較 35
4.3.2孔隙水壓比激發曲線 36
4.3.3應力路徑 37
4.3.4體積應變與最大剪應變 37
第五章結論與建議 40
5.1 結論 40
5.2 建議 41
參考文獻 43

參考文獻

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指導教授

黃俊鴻(Jin-Hung Hwang)

審核日期

2002-7-18

推文