臺灣博碩士論文加值系統

台灣目前位於菲律賓海板塊與歐亞大陸板塊的交界面上，地震繁複。1999年921集集大地震造成嚴重災情，且於許多砂性土層地區發生了液化現象，這些地區包括台中港區、台中縣霧峰鄉與太平市、彰化縣員林鎮、南投縣草屯與南投市等地，並且發現這些液化土壤的細料含量都相當高，因此有必要針對台灣本土高細料含量的砂土液化問題進行研究。

本研究改進前人之貫入錐，增加其精密度。並在標度槽中，K0狀況下，控制相同乾密度，細料含量不同的貓羅溪砂土進行微型貫入錐試驗，得到錐尖阻抗(qc)與摩擦阻抗(fs)。討論細料含量對錐尖阻抗與摩擦阻抗之影響，以及其土壤液化強度之關係。

試驗結果顯示在隨著細料含量的增加錐尖阻抗會下降。在細料含量對摩擦阻抗影響方面，本研究在低細料含量有量得摩擦阻抗值，但在高細料含量卻無法量得。其原因可能為由於細料的增加，貫入時所激發的超額孔隙水壓使試體有效應力下降，在相同細料含量的情況下，不同埋設深度之水壓計超額水壓會隨著貫入深度增加而上升，直到貫入到其埋設位置後達最大值。依本研究結果推論，對圓錐貫入試驗所得的圓錐貫入阻抗值(qc)所作細料含量的修正是因為隨著細料含量的增加，qc1會下降而液化強度並無太大改變的緣故。

本研究亦評估目前常用之CPT液化潛能評估法對本試驗結果之適合性，但結果並不理想。顯示這些評估法對於本土高細料含量土壤之適用性有待更進一步確認。

This study conducted mini-cone penetration test in the Maoluo River soils of different fines contents under K0 condition with improved precision of the sleeve friction measurement. The effect of fines content on cone penetration resistance and sleeve friction resistance was studied and its relation with the liquefaction resistance of the soil obtained in the cyclic triaxial tests was also evaluated.

　　The test result show the normalized cone penetration resistance decreased with increasing fines content of the Maoluo river soils and the excess pore water pressure increased with increasing fines content of the Maoluo river soils.This study descries that the effects of the excess pore water pressure generation on mini cone penetration resistance and sleeve friction resistance.

The results of using the CPT-based liquefaction potential evaluation methods are not in good agreements with those of the laboratory test in this study. The reason maybe that the soils classification methods of the existing methods are not suitable for the local soils with high fines content in Taiwan.

目錄

誌謝 II
摘要 III
ABSTRACT IV
圖目錄 VIII
表目錄 XII
第一章　前言 1
1-1 研究動機與目的 1
1-2 研究方法與內容 2
第二章 文獻回顧 3
2-1 CPT液化潛能評估法 3
2-1-1 Shibata and Teparaksa法 3
2-1-2 Stark and Olson法 4
2-1-3 Olsen法 5
2-1-4 Robertson and Wride法 6
2-1-5 上述方法之適用性 7
2-2 前人之微型貫入試驗 9
第三章 試驗內容與試驗設備 18
3-1　試驗土樣的基本性質與特性 18
3-2 試驗設備與貫入儀器之改進 18
3-2-1 微電子式貫入錐 19
3-1-2 微型貫入錐之標定 19
3-2-3 微型貫入錐之改進 20
3-2-4 試驗圓槽與貫入設備 21
3-3　圓錐貫入試驗步驟 22
3-3-1　重模試體準備 22
3-3-2　試體裝填與量測儀器之設置 22
3-3-3　試體飽和 23
3-3-4　施加垂直載重 23
3-3-5　圓錐貫入 23
第四章　試驗結果與討論 41
4-1 貫入結果數據分析 42
4-1-1 細料含量對覆土應力傳遞之影響 42
4-1-2　細料含量對於超額孔隙水壓激發的影響 42
4-1-3　細料含量對錐尖阻抗之影響 43
4-1-4　細料含量對摩擦阻抗之影響 44
4-1-5　超額孔隙水壓對錐尖阻抗與摩擦阻抗之影響 45
4-2　細料含量對於正規化錐尖阻抗與液化強度之影響 46
4-3　與前人之CPT液化強度評估法比較 47
第五章 結論與建議 62
參考文獻 64

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