台北粉質黏土電滲透化學灌漿之研究｜國立臺灣科技大學博碩士論文系統

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研究生：	吳秉謙 Ping-Chien Wu
論文名稱：	台北粉質黏土電滲透化學灌漿之研究 The Study of Electroosmotic Chemical Treatment for Taipei Silty Clay
指導教授：	歐章煜 Chang-Yu Ou
口試委員:	林宏達 Horn-Da Lin 簡紹琦 Shao-Chi Chien 鄧福宸 Fu-chen Teng
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：	2017
畢業學年度：	105
語文別：	英文
論文頁數：	133
中文關鍵詞：	電滲透化學灌漿、台北粉質黏土
外文關鍵詞：	Electroosmotic Chemical Treatment, Taipei Silty Clay
相關次數：	點閱：236 下載：31
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上一筆

電滲透化學灌漿試驗運用於高嶺土，其結果能有效增加試體內各區域之室內圓錐貫入試驗之阻抗強度，達到全面改良之效果。為了解此方法於現地黏土之適用性，及全面改良成效，本研究依序進行下列三個系列的試驗：（1）長時間灌入醋酸鈣，以觀察最適當更換溶液的時間；（2）灌入水玻璃前正極區域的中性化或鹼性化；（3）於水玻璃灌入後灌入去離子水以延長試驗時間至360小時。研究結果顯示：（1）使用氯化鈣溶液比使用醋酸鈣溶液更加合適，因為醋酸鈣溶液在灌入過程中會因電解於正極處產生二氧化碳；（2）將先前研究於高嶺土成功達到全面改良的組合，運用於台北黏土並無法達到全面改良，研判可能原因為台北黏土的組成主要為56%的伊利土及其有較高嶺土高的陽離子交換能力。

The Electroosmotic Chemical Treatment (ECT) method has already been studied in kaolinite in recent years, and it also has been proven that using ECT method in kaolinite could achieve full improvement (i.e. from anode to cathode). The objective of this study was to understand the effectiveness and applicability of the ECT method in in-situ soil. A series of experiments with three phases were performed: (1). Finding the most suitable time of injection of the Ca(CH3COO)2 solution before the injection of another chemical solution, (2). The neutralization or alkalization at NA area before performing the W.G. solution injection stage, (3). Extending the total duration of 360 hours by injecting deionized water after the injection of W.G. solution. The results indicate that using CaCl2 solution is more feasible than using Ca(CH3COO)2 solution. These results may be due to the CO2 produced at anode area during the injection of the Ca(CH3COO)2 solution because of electrolysis effect. The tests in Taipei clay cannot achieve full improvement even if the experiment conditions are the same as the previous tests in kaolinite, which can achieve full strength improvement. The reason might be that the various minerals (i.e., 56% of illite) and higher cation exchange capacity (CEC) of Taipei clay compared to that of kaolinite.

中文摘要    I
Abstract    II
Acknowledgement    III
Table of Contents    IV
List of Tables    VII
List of Figures    VIII
Chapter 1 INTRODUCTION    1
1 Background    1
2 Objectives    2
3 Thesis Structure    2
Chapter 2 LITERATURE REVIEW    3
1 Introduction    3
2 Electroosmotic Chemical Treatment    3
2.1 Principle    3
2.2 Electrokinetic Phenomenon    4
2.3 Electrochemical Effects    5
3 Soil Improvement Using Calcium Ions    6
4 Soil Improvement Using Sodium Silicate (W.G.) solution    10
5 Using various combinations of injected chemical solutions in ECT    12
5.1 Injecting CaCl2 solution before W.G. solution    12
5.2 Injecting Ca(CH3COO)2 solution before W.G. solution    17
5.3 pH neutralization at anode before injection W.G. solution    19
5.4 Effects of replacing the acidified W.G. solution and extended duration by injecting deionized water    23
5.5 ECT Full Strength Improvement    28
6 Summary    33
Chapter 3 EXPERIMENTAL METHODOLOGY    36
1 Introduction    36
2 Experimental Plan    36
3 Experimental Materials    40
3.1 Soil and water    40
3.2 Chemical Solutions    42
3.3 Filter Paper    44
4 Experimental Apparatus    44
4.1 Design of the ECT Test Cell    44
4.2 Cylinders and Piezometers    46
4.3 Loading system    50
4.4 Electrode    50
4.5 Power Supply    51
4.6 Monitoring System    53
5 ECT Test Procedure    55
5.1 Flowchart    55
5.2 Installation of the ECT Cell    55
5.3 Sample Preparation    56
5.4 Consolidation    56
5.5 Installation of Cylinders, Monitoring System, and Power Supply    57
5.6 Injection stages of chemical solutions    57
6 Laboratory Test of Treated Soil    58
6.1 Cone Penetration Test    58
6.2 Water Content Measurement    64
6.3 pH Measurement    65
6.4 ICP-AES Analysis    68
Chapter 4 RESULTS AND DISCUSSION    70
1 Introduction    70
2 Phase 1 of ECT Test: Turning Point    70
3 Phase 2 of ECT Test: Neutralization or alkalization    71
3.1 Injection of Ca(CH3COO)2 solution for 48 hours    72
3.2 Injection of W.G. solution after injecting Ca(CH3COO)2 solution    75
3.3 Injection of low concentration of KOH solution between Ca(CH3COO)2 solution and W.G. solution    82
3.4 Different concentrations and duration of KOH solution and types of soils    85
3.5 Comparison between CaCl2 and Ca(CH3COO)2 solution    88
3.6 Discussion    91
4 Phase 3 of ECT Test: Full Improvement    93
4.1 Injection of deionized water for 360 hours    93
4.2 Treatment of extending duration (456 hours)    99
4.3 Discussion    103
Chapter 5 CONCLUSION AND RECOMMENDATIONS    110
1 Conclusion    110
2 Recommendations    112
References    113
Appendix A    117

                                

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