카사그란데방법과 원추관입시험방법의 상관관계와 표층개량제의 적용성에 대한 연구 = A study on the correlation between casagrande test and fall cone test methods, and their applicability in soil stabilization

다국어 초록 (Multilingual Abstract)

The construction technologies of Korea have developed through the construction of large-scale civil engineering structures. Recently, as the size of these structures increases and the range of land use expands, construction in harsh environments such as mountainous areas is required. As a result of such development, many civil works are carried out in mountainous areas and a large number of people live in them. As a result, landslides or slope collapses frequently occur in densely populated areas, resulting in increased loss of life and property. In addition, the frequency of slope collapse accidents is increasing in conjunction with localized heavy rains that have recently occurred frequently due to global warming. In order to prevent this, the reinforcement methods used as reinforcement methods such as nailing and anchoring to prevent failure of the bottom and arcs were not suitable for preventing collapse due to surface failure, which accounted for more than 65% of slope failures. Therefore, the surface layer improvement method using the surface layer improver was carried out, and in this study, the optimal mixing ratio for the use of the surface layer improver was proposed for the soil of 18 sites where actual collapse occurred, and the Casagrande method and the cone penetration test method were proposed in the process. The correlation and accuracy of these two methods were confirmed. According to this, the soil was classified and the mixing ratio according to the classification result was compared.
1. First of all, it was found that the Casagrande method had a very large deviation in accuracy, which was judged to be due to the problem of proficiency and the problem by obtaining static elements with dynamic test methods. it is believed that accurate results can be obtained when we may use these two mothods and review.
2. Correlation was obtained by referring to previous literature data, and it was shown in comparison with other previous data.
3. Through the uniaxial compression test, when the surface layer improver was added to the original ground and mixed, a definite increase in strength was confirmed and it was judged to be suitable for use.
4. In order to apply the surface layer improver, the optimal mixing ratio was obtained by utilizing a specific strength range rather than simply relying on water content. At this time, when the soil was classified by the Casa Grande method, a clear classification did not proceed, so the soil was classified using the cone penetration test method. As a result, both coarse-grained and fine-grained soils were clearly distinguished. The optimal mixing ratio was suggested as 6% for ML, 9% for CL, and 12% for CH and MH. And it is judged that it is necessary to supplement through reliability verification through additional tests of various test groups.

목차 (Table of Contents)

• 목 차 ⅰ
• 표 목 차 ⅳ
• 그 림 목 차 ⅴ
• ABSTRACT ⅷ
• 제 1 장 서 론 1
• 1.1 연구배경 및 목적 1
• 1.2 연구연혁 5
• 1.3 연구내용 및 범위 7
• 제 2 장 이론적 배경 8
• 2.1 AAS(Alkali Activated Slag)계 무기 결합제 8
• 2.2 통일분류법 10
• 2.2.1 조립토와 세립토의 구분 11
• 2.3 Atterberg’s Limits의 의의 13
• 2.3.1 Atterberg’s Limits를 이용한 지수들 14
• 2.4 카사그란데법 19
• 2.4.1 카사그란데방법의 액성한계 측정법 19
• 2.4.2 카사그란데방법의 소성한계 측정법 20
• 2.5 원추관입시험방법(Fall Cone Test) 21
• 2.5.1 원추관입시험방법의 이론 23
• 2.6 원추관입시험방법을 통한 소성한계 측정 28
• 2.6.1 Harison(1988)의 방법 28
• 2.6.2 Feng(2000)의 방법 30
• 제 3 장 시험 방법 32
• 3.1 시험개요 32
• 3.2 흙 입자 밀도 시험(KS F2308) 32
• 3.3 흙의 입도 시험방법(KS F2302) 34
• 3.4 비중계 시험(KS F2302) 37
• 3.5 다짐 시험(KS F2312) 40
• 3.6 카사그란데방법(KS F2303) 43
• 3.7 원추관입시험방법(BS 1377) 46
• 3.8 일축압축시험 48
• 제 4 장 시험 결과 및 분석 51
• 4.1 물리적 시험 51
• 4.1.1 카사그란데방법의 액·소성시험 결과 53
• 4.1.2 원추관입시험방법의 액·소성시험 결과 54
• 4.2 카사그란데방법과 원추관입시험방법의 관계 55
• 4.2.1 카사그란데방법과 원추관입시험방법의 정확도 비교 55
• 4.2.2 카사그란데방법과 원추관입시험방법의 상관관계 58
• 4.3 일축압축강도 시험 결과 61
• 4.3.1 일축압축강도와 최적배합비 산정 이유 61
• 4.4 최적배합비 제안 73
• 4.4.1 카사그란데방법을 활용한 최적배합비 73
• 4.4.2 원추관입시험방법을 활용한 최적배합비 75
• 제 5 장 결 론 78
• 참고문헌 80