| 姓名 | 陳維孟(Wei-Meng Chen) | 電子郵件信箱 | s9011634@cyut.edu.tw | |
| 畢業系所 | 營建工程系碩士班(Department and Graduate Institute of Constrction Engineering) | |||
| 畢業學位 | 碩士(Master) | 畢業時期 | 91學年第2學期 | |
| 論文名稱(中) | 顆粒形狀、級配對飽和砂質土壤液化相關行為之研究 | |||
| 論文名稱(英) | Influence of Grain Shape And Cofficient of uniform on Liquefaction-related Behavior of Saturated Granular Soils | |||
| 檔案 |
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論文使用權限 | 校內外完全公開 | |
| 論文語文/頁數 | 中文/95 | |||
| 摘要(中) | 臺灣地質構造主要受到歐亞大陸版塊與菲律賓海板塊擠壓影響，使岩層瞬間發生破裂錯動而將能量釋出，此即斷層活動並產生地震現象。震動可能造成土體內土壤顆粒重新排列使土壤趨向於緊密，此時土壤內因為孔隙擠壓而造成孔隙水壓顯著增加，而土壤有效應力有時可降低至零或更低，以致於土壤剪力強度降低甚至使土壤成為液態現象而不具任何剪力強度，即稱為液化，此現象在地震中被證實為造成損害之主要原因之一。而土壤顆粒本身的差異和土壤顆粒組合的不同，對於液化亦有顯著的影響，本研究將探討土壤顆粒形狀及級配土壤之均勻係數兩部分對於液化相關行為之研究。 研究結果顯示土壤之內摩擦角會隨著顆粒形狀不同而有所不同，而土壤的內摩擦角會影響液化時的能量指數及液化後的體積應變量。角顆粒的液化能量指數平均比圓顆粒的液化能量多了3〜 4倍，地動加速度增加超過100gal，比次角顆粒的液化能量平均多了1.5倍，地動加速度多出30gal 〜40gal。沉陷量部分，圓顆粒液化後的體積應變量為4%，平均比角顆粒的應變量多出2%左右，比次角顆粒的應變量多出1%左右。各顆粒形狀中殘留的細粒料會影響土壤抗液化的能力，導致在地震中最易液化的範圍也不同，角顆粒為0.05mm〜0.2mm，次角顆粒為0.075mm〜0.2mm，片狀顆粒為0.2mm〜0.6mm。級配土壤的均勻係數越大，抵抗液化能力越高，液化後體積應變越小，均勻係數Cu=27的液化能量平均比Cu=4大了2倍，地動加速度多出60gal〜70gal，而在體積應變方面，Cu=27的體積應變量為3.8%，Cu=4的體積應變為6.2%，減少了了2.4%左右。 關鍵字：液化、粒徑分佈，體積應變 | |||
| 摘要(英) | Taiwan is located
between of two of the world’s major tectonic plates. Earthquake occurred
very often in this area and caused many disasters in the past. When a
saturated sand deposit is subjected to ground vibrations, it tends to
compact and decrease in volume. If drainage is inadequate, the tendency
to decrease in volume results in an increase in pore water pressure.
When pore water pressure built up is equal to or greater than the
overburden pressure, the sand deposit becomes partially or completely
liquefied. This phenomenon is called liquefaction, which is one of the
reason that causes severe damages to the structures during major
earthquakes in saturated sand deposits. The purpose of this research
were to study the effect of grain shape and coefficient of uniform on
liquefaction-related behavior of sandy soils using portable soil tank
and shaking table. The Results of the study revealed that rounded-grained soils have the highest liquefaction potential while angular-grained soils are most unlikely to liquefy. In the other hand, the volume strain from liquefaction in rounded-grained soils is 2% more than angular-grained soils has. The Results of the study also indicate that the most liquefialble grain sizes are 0.05mm ~ 0.2mm for angular soils, 0.075mm ~ 0.2mm for sub-angular soils, 0.2mm ~ 0.6mm for plate-shape soils. Keyword：liquefaction、liquefaction potential、volume strain | |||
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