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碩士論文公告區 |
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| 年度： | 96 | |
| 姓名： | 陳昱翔(Yu-Xiang Chen) | |
| 論文題目(中)： | 利用波傳理論檢測土壤夯實品質之可行性評估 | |
| 論文題目(英)： | Evaluation the Compaction Quality of Soil Using Stress Wave Propagation Method | |
| 摘要(中)： | ||
| 本研究的主要目的乃是探討能否利用波傳原理來建立一套同時能測定土壤的夯實狀態及工程性質之非破壞檢測技術，以取代費時費力之工地密度砂錐法做為夯實土層施工品質之判定標準。其研究方法主要是針對雲林縣湖山水庫大壩工程之預輾壓殼層及心層土壤材料，經現場輾壓機滾壓後進行應力波波速檢測；配合室內夯實試驗、波速檢測、土壤密度、含水量及加州承載比試驗，探討其相關性，並建立實驗室剪力波波速與乾密度迴歸曲線，再將現地檢測後之波速帶入此迴歸曲線求得現地乾密度，與砂錐法所得之密度以茲比較。 室內試驗發現：不論是殼層或心層土壤材料，乾側夯實之試體其乾密度增加，波速亦隨之增加，其相關性佳，故將來選擇含水量較低之乾側來夯實時，可利用剪力波波速來評估乾密度。土壤乾密度及波速與加州承載比關係，在三種不同含水量情況下，不論是利用剪力波波速來評估強度性質（加州承載比），都優於土壤乾密度。推估所得之乾密度較工地乾密度明顯偏高，而在推估所得之含水量則略低於現地含水量，效果不甚理想，而推估含水量與現地含水量迴歸關係優於推估乾密度與工地乾密度之迴歸關係。 |
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| 摘要(英)： | ||
| The construction of highway embankment or earth dam requires compacting back-fill materials lay-by-layer. In practice, for the purpose of quality control, Proctor test and sand cone test are performed to measure the "relative compaction" of a compacted layer. However, the sand cone test is a destructive test and performing this test is labor intense and time consuming. The objective of this thesis to investigate the feasibility of evaluating the compaction quality of soils by stress wave propagation speeds. To achieve this goal, Proctor test, stress wave propagation velocity test, and California Bearing Ratio (CBR) test were performed in the laboratory on two different materials used in the earth dam of the Who-Shan Reservoir to obtain the calibration curve between the dry density and S-wave velocity. In addition, stress wave propagation velocity tests were also performed on the compacted layers in the field to back calculate the field density of these materials. Results of laboratory tests indicate that the stress (P and S) wave velocities of the samples are proportional to their dry density for samples compacted at dry of optimum. On the other hand, the P-wave and S-wave velocities of the samples decrease as their water content increases. Finally, both the P wave and S wave velocities of the samples are proportional to their CBR values. However, the back calculated field densities using the measured S-wave propagation velocities with the laboratory calibration curve are slightly higher than values obtained from sand cone tests. Therefore, application of this technique to evaluate the compaction quality of soils should be further studied. |
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| 檔案： | 9411624.pdf | |
| 相關連結： | http://ethesys.lib.cyut.edu.tw/ETD-db/ETD-search-c/view_etd?URN=etd-0130108-061024 | |