해안사구 특성을 고려한 MICP 처리 모래의 공학적 거동 분석 = Analyzing Engineering Behavior of MICP-Treated Sand Considering Characteristics of Coastal Dune|RISS 상세보기

다국어 초록 (Multilingual Abstract)

Coastal dunes are formed when sand is transported and deposited by the wind. It plays a role in ecosystem conservation and natural disaster protection. Coastal dunes have a self-recovering ability. Nevertheless, coastal dune erosion occurs every year.Microbially induced carbonate precipitation (MICP) technology is an eco-friendly method that improves the stiffness and strength of the ground. In this thesis, the applicability of MICP to coastal dunes was studied. Considering coastal conditions, the bacterial activity of MICP to coastal sand having seawater as a solvent for the chemical solution was investigated. Thereby, various soil column tests were performed and the strength of MICP-treated sand was evaluated. Afterwards, wind tunnel tests were conducted to simulate the erosion behavior of coastal dunes. Untreated sand and MICP-treated sand were prepared and erosion parameters were assessed. Surface changes before and after erosion were observed using a 3D scanner, and erosion behavior and erodibility parameters were analyzed. The carbonate precipitation levels in MICP-treated sands were quantified through subsequent hydrochloric acid washing. The soil improvement efficiency through surface percolation of MICP solution in sand in terms of unconfined compressive strength was evaluated using a needle penetrometer. Furthermore, mineralogical changes in sand after MICP treatments using different solvents were also observed through microstructural analysis. The results indicate that, in comparison with deionized water, seawater slows down the rate of urea hydrolysis. Strength improvement of the MICP treated sand surfaces was effectively evaluated through needle penetration tests. The level of cementation and soil’s strength increase with the number of MICP treatments, which leads to improved resistance against erosion by wind. A correction coefficient was proposed in this study to correlate wind-induced shear stress and water-induced shear stress. This study advocates sufficient possibility of the MICP application for protecting coastal dunes.

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목차 (Table of Contents)

I. 서 론 1
1. 연구의 배경 1
2. 기존연구의 사례 5
1) MICP 약액 처리한 모래의 거동 5
2) 해수 조건에서 미생물 활동성 및 강도 발현 5

I. 서 론 1
1. 연구의 배경 1
2. 기존연구의 사례 5
1) MICP 약액 처리한 모래의 거동 5
2) 해수 조건에서 미생물 활동성 및 강도 발현 5
3) MICP 약액 처리한 모래의 풍력에 의한 침식 거동 6
3. 연구의 구성 8
II. 해수에서 미생물 활동성과 반응 효율성 10
1. 서론 10
2. 재료 10
1) 용매 10
2) MICP 약액 11
3. 실험방법 12
1) 미생물 활동성 12
2) 탄산칼슘 형성 효율 13
4. 실험결과 13
1) 미생물 활동성과 탄산칼슘 형성 효율 13
5. 소결 18
III. MICP 처리 모래의 강도 특성 19
1. 서론 19
2. 재료 19
1) 시료 및 소일칼럼 19
2) MICP 약액 처리 20
3. 실험방법 21
1) 강도평가 21
2) 탄산칼슘 형성량 측정 23
3) 미세 구조 및 성분 분석 24
4. 실험결과 24
1) 강도평가 24
(1) 일축압축시험의 한계 24
(2) 침관입시험 26
2) 미세 구조 및 성분 분석 28
5. 소결 30
Ⅳ. MICP 처리 모래의 침식 거동 31
1. 서론 31
2. 재료 31
1) 풍동 31
2) 시료 및 소일박스 32
3) MICP 약액 처리 33
3. 실험방법 34
1) 풍동 실험 34
2) 침식성 정수 산정 36
3) 고결도 평가 39
4. 실험결과 40
1) 육안관찰 40
2) 침식률과 풍속의 관계 41
3) 고결도 및 강도평가 42
5. 풍속의 풍력 변환에 대한 고찰 45
6. 소결 47
Ⅴ. 결론 49
참고문헌 51
감사의 인사 56

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해안사구 특성을 고려한 MICP 처리 모래의 공학적 거동 분석 = Analyzing Engineering Behavior of MICP-Treated Sand Considering Characteristics of Coastal Dune

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