研究生: |
蔡孟棻 Meng-Fen Tsai |
---|---|
論文名稱: |
以土壤水份特性曲線評估不飽和土壤邊坡穩定性 Evaluating Stability of Unsaturated Soil Slope Using Soil-Water Characteristic Curve |
指導教授: |
林宏達
Horn-Da Lin |
口試委員: |
禇炳麟
none 黃偉慶 none |
學位類別: |
碩士 Master |
系所名稱: |
工程學院 - 營建工程系 Department of Civil and Construction Engineering |
論文出版年: | 2005 |
畢業學年度: | 93 |
語文別: | 中文 |
論文頁數: | 147 |
中文關鍵詞: | 不飽和土壤,土壤水份特性曲線、林口紅土 |
外文關鍵詞: | Linkou Terrace Lateritic Soil |
相關次數: | 點閱:373 下載:12 |
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傳統土壤力學並未考慮不飽和土壤中基質吸力對剪力強度之影響。然而許多工程實務問題大都涉及不飽和土壤之領域。故本研究嘗試以較簡便之方法推估不飽和土壤強度參數。以林口紅土分別進行壓力鍋試驗、鹽溶液試驗及濾紙法試驗,並根據試驗結果迴歸分析建立完整之土壤水份特性曲線方程式。最後利用完整土壤水份特性曲線推估不飽和土壤之剪力強度做為數值分析之參數。
試驗結果顯示,以壓力鍋試驗與鹽溶液試驗所建立之完整土壤水份特性曲線,可求得林口紅土進氣值吸力(ua-uw)a=290kPa,殘餘吸力值(ua-uw)r=21000kPa,飽和體積含水比θs =0.54,殘餘體積含水比θr=0.0216。另外以土壤水份特性曲線所推估之不飽和土壤剪力強度參數,能合理反應現地不飽和土壤邊坡之破壞行為,相較於使用傳統三軸UUU之參數,建議採本研究之推估方式以期使不飽和邊坡穩定分析更加嚴謹。
Classical soil mechanics doesn’t consider the influence of the matric suction in unsaturated soils on shear strength. However, mechanics of unsaturated soils is involved in many geotechnical problems. The objective of this study is to estimate the shear strength of unsaturated soils by using a simplified method. Base on the pressure plate test, the salt solution test and the filter paper test on Linkou Terrace Lateritic Soil, the equation of complete soil-water characteristic curve is established from the regressive analysis. At last, the shear strength of unsaturated soil estimated from the soil-water characteristic curve is used in the numerical analysis.
The results indicate that a reasonable complete soil-water characteristic curve can be established from the pressure plate test and the salt solution test. Key parameters determined from the soil-water characteristic curve are Air Entry Suction (ua-uw)a=290kPa, Residual Matric Sucion (ua-uw)r=21000kPa, Saturated Volumetric Water content θs =0.54, Residual Volumetric Water content θr=0.0216. It is more reasonable to analyze the slide behavior of the unsaturated soil slope by using the shear strength estimated from soil-water characteristic curve. Compared to using the shear strength obtained from the traditional triaxial unsaturated unconfining undrained (UUU) shear strength test, it is more rigorous to apply the model proposed by this study while analyzing the stability of the unsaturated soil slope.
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