研究生: |
legesse Abaddi Sengal Legesse Abaddi |
---|---|
論文名稱: |
以化學穩定劑對臺北天然粉土質黏土之電動性質影響實驗研究 Experimental investigation of the effect of electrokinetic on natural Taipei silty clay using chemical stabilizers |
指導教授: |
歐章煜
Chang-Yu Ou |
口試委員: |
楊國鑫
Kuo-Hsin Yang 謝百鈎 Pio-Go Hsieh 鄧福宸 Fu-Chen Teng 林宏達 Horn-Da Lin 歐章煜 Chang-Yu Ou |
學位類別: |
博士 Doctor |
系所名稱: |
工程學院 - 營建工程系 Department of Civil and Construction Engineering |
論文出版年: | 2021 |
畢業學年度: | 109 |
語文別: | 英文 |
論文頁數: | 155 |
中文關鍵詞: | 動電穩定 、pH值 、沉澱 、聚合 、臺北粉土質黏土 |
外文關鍵詞: | Electrokinetic stabilization, pH, precipitation, polymerization, Taipei silty cl |
相關次數: | 點閱:174 下載:0 |
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應用動電穩定系統(Electrokinetic stabilization system)有增加土壤強度及減少軟弱土壤沉陷量的可能性,本研究旨在探討鈣離子(Ca2+ ions)及pH值對臺北粉土質黏土抗剪強度的影響,以提高土壤強度。此研究進行一系列的試驗以氯化鈣(Calcium chloride)、氫氧化鉀(Potassium hydroxide)和矽酸鈉(Sodium silicate)溶液注入臺北粉土質黏土中並以不同的時間處理。試驗後量測試體的含水量、pH值、鈣離子濃度、圓錐阻抗、溶液注入量及排水量。其試驗結果因臺北粉土質黏土的電滲滲透係數低,故與高嶺土相比其溶液注入量、排水量、鈣離子濃度及試驗後的土壤強度均較其低。
經過12-48小時處理後的土壤試體,由於處理時間短,土壤強度沒有明顯改善。 然而經過120小時處理後,因鈣離子沉澱及土壤固結的影響,土壤試體1.5MC120的強度有所增加。通過將這些研究的試驗結果與高嶺土的試驗結果進行比較,建立出適用於臺北粉土質黏土的氯化鈣溶液濃度及合適注入時間的注入程序,即1.5MC48、0.2MC120和0.75MC120。依次向土壤試體注入氯化鈣、氫氧化鉀和矽酸鈉可觀察到由於存在某種程度的矽酸鈉聚合及陰極處的土壤固結,在陽極處的土壤強度有明顯改善。
研究顯示,以96小時內分別在陽極和陰極以0.2MCaCl2處理的土壤試體,其圓錐阻抗分別提高了554.84%和116.49%。 與1.5MC120處理的現場1土壤樣品的土壤強度相比,陽極和陰極的圓錐阻抗分別增加307.14%和180.46%。
The application of an electrokinetic stabilization system has the potential to increase the soil strength and reduce the settlement of the soft soil. This study aimed to examine the effect of Ca2+ions and pH on the shear strength of Taipei silty clay and to maximize the soil strength. A series of experimental tests were conducted using calcium chloride, potassium hydroxide, and sodium silicate solutions injecting into Taipei silty clay for different treatment times. After the tests, water content, pH, concentration of Ca2+ ions, cone resistance, injection volume, and drainage water volume were measured. As a result, the injection volume, drainage water volume, concentrations of Ca2+ ions, and strength were observed low as compared to kaolinite because Taipei silty clay possessed a low coefficient of electro-osmotic permeability. After 12-48 h treatment, no significant improvement in soil strength occurred due to the short treatment time. However, after 120 h treatment, the soil strength of 1.5MC120 increased moderately due to Ca2+ precipitation and soil consolidation. By comparing the results from those basic studies with those of kaolinite, an appropriate injection procedure with concentration of calcium chloride solution and suitable injection time, i.e., 1.5MC48, 0.2MC120, and 0.75MC120, for Taipei silty clay were established. Injection of calcium chloride, potassium hydroxide, and sodium silicate sequentially inthe to soil was observed significant improvement at anode due to the presence of some extent of polymerization of sodium silicate as well as due to soil consolidation the at cathode. As a result, the cone resistance was increased 554.84% and 116.49% times that of treated soil with 0.2MCaCl2 for 96 hours at anode and cathode, respectively. The cone resistance was increased by 307.14% and 180.46% at anode and cathd e, respectively as compared to the soil strength of 1.5MC120 in soil sample site-1.
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