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碩士論文公告區 |
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| 年度： | 96 | |
| 姓名： | 廖俊傑(Jun-Jie Liao) | |
| 論文題目(中)： | 顆粒形狀對飽和砂質土壤二次液化相關行為影響之研究 | |
| 論文題目(英)： | Influence of Grain Shape on Reliquefaction-related Behavior of Saturated Granular Soils | |
| 摘要(中)： | ||
| 本研究將先前設計之土壤液化箱並利用小型震動台，做震動液化試驗 來探討顆粒形狀對飽和砂質土壤在二次液化的影響及相關行為研究。 研究結果顯示相對密度、排水情況和液化間隔時間均會影響震動能量指數，當相對密度提高、排水情況良好和液化間隔時間越長二次液化能量比值N值均會提高，而其中又以相對密度所影響的程度最大，且片狀顆粒試體的二次液化能量比值N值受相對密度提高而提高的值最為明顯；此外，二次液化沉陷差值Δεv會隨著相對密度提高、排水情況良好和液化間隔時間越長而降低，其中也以相對密度所影響的程度最大；在控制因素相同情況下各組試驗結果顯示片狀顆粒試體的N值為圓顆粒試體的2.7~6倍，而角顆粒試體的N值則為圓顆粒試體的1.1~2.3倍。而三種不同顆粒形狀的Δεv會隨著相對密度提高而降低，以圓顆粒試體之Δεv為基準來討論，在各組試驗結果顯示片狀顆粒試體的Δεv為圓顆粒試體的1.28~1.78倍，而角顆粒試體的Δεv則為圓顆粒試體的0.43~0.63倍。 |
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| 摘要(英)： | ||
| The study was conducted using the liquefaction tank on a portable shaking table which was previously designed and developed at Chaoyang University. The main purpose of the study was to investigate the effects of soil grain shape on the re-liquefaction related behavior of saturated sand deposits including the energy required and resulting settlements compared with those of the previous liquefaction. Three grain shapes were used in the study including round, angular, and sheet grain shapes. The results of the study revealed that relative density Dr, drainage condition within the liquefied soil mass and the time elapsed between the previous liquefaction and the re-liquefaction which may occur in after shocks following the strong main shocks within a time interval ranging from minutes to days are the controlling factors. The results of the study revealed that greater relative density Dr, better drainage condition and longer time period between the previous and the re-liquefaction lead to higher re-liquefaction energy ratio N and less settlement, among which the relative density Dr exhibits the most significant influence. In addition, the sand with sheet grain shape has the highest re-liquefaction energy ratio N, which implies that more energy is required to liquefy the soil mass with sheet grain shape compared with that for the previous liquefaction, however, once the re-liquefaction occurs, the settlements are the highest. The results indicate that the re-liquefaction energy ratio N is 2.7 - 6 times and 1.1 – 2.3 times for sheet grain and angular grain respectively compared with that of the round grain shape. Also, the settlements resulted from re-liquefaction compared with that from previous liquefaction is the least for the angular grain which is about 0.43 – 0.63 time of that for round grain. At the same time, the sheet grain exhibits significantly greater settlements, once re-liquefied, which is about 1.28 – 1.78 time of that for the round grain sand. The study results provide useful information for earthquake hazard mitigation for the areas where re-liquefaction due to after shocks may occur. |
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| 檔案： | 沒有相關檔案 | |
| 相關連結： | http://ethesys.lib.cyut.edu.tw/ETD-db/ETD-search-c/view_etd?URN=etd-0822108-135916 | |