세립분 함유율에 따른 액·소성한계 보정방법 = Correction method of liquid and plastic limit based on the fine contents

다국어 초록 (Multilingual Abstract)

Korea sees an increasing demand for industrial and residential land is increasing due to continued economic growth and development. With a relatively smaller national territory and three sides of the country bordered by the sea, Korea has implemented a lot of seashore land reclamation and dredge projects nationwide until recently to build industrial complexes and to expand farmlands. In particular, the western and southern coastal areas are covered with mud flats featuring shallow water levels and soil texture comprised mostly of clay silt or silt clay, which is an unfavorable condition from a geo-engineering perspective, requiring various surveys, tests, and coming up ways to meet the quality requirements of ground in order to turn the soft ground to the land for industrial and residential complexes. The geo-engineering properties of soft ground clay are extremely diversified and complicated and are difficult to generalize or classify into several categories depending on the ground formation and deposition, type of clay minerals, and the physical and chemical bonds. In addition, the port region has quite a few areas covered with soil belonging to the category somewhere between sand and clay due to its unique sedimentary environment. In general, the soils subject to ground surveys and result analyses to identify the ground subsidence or stability for various structures are classified into the sandy soil and the cohesive soil, and the liquid limits of such soils are analyzed to evaluate the physical properties and engineering characteristics of the ground and to classify soils. Against this backdrop, this study has produced the soil mixed with clay and sandy soil from Yangsan, Gwangyang, and Busan regions considering the intermediate soil properties of sedimentary sites and conducted consistency limit tests on it, and carried out its applicability using the proposed consistency-correction formula. The study also aims to evaluate site applicability through comparative analysis on the site soil using the consistency-correction formula. The fine-grained rates of 50%, 75%, and 100% have been used to produce mixed or intermediate soil between clay and sand. The clay has been collected in Yangsan, Gwangyang, and Busan regions and what have successfully passed through μ75 sieve have been used as a sample in the analyses while the sandy soil has been collected in Yangsan region and used as a sample for consistency changes depending on changes in soil characteristics. In addition, the study has conducted consistency analyses by mixing the intermediate soil with a certain percentage bentonite to adjust the characteristics of soil and based on the consistencies obtained by experiment and by the consistency-correction formula using the consistency-correction formula proposed in the previous study. The consistencies obtained by experiment and by the consistency-correction formula on the intermediate soil collected on-site have been comparatively analyzed, the compression index has been estimated by applying the consistency-correction formula, and the compression indexes by experiment and by the consistency-correction formula have been comparatively analyzed to evaluate on the applicability of the proposed formula.

목차 (Table of Contents)

• Ⅰ. 서론 1
• 1.1 연구배경 및 필요성 1
• 1.2 연구동향 2
• 1.3 연구내용 및 방법 3
• Ⅱ. 세립토 함유에 따른 역학적 특성 5
• 2.1 흙의 공학적 특성 5
• 2.1.1 흙의 물리적 특성 5
• 2.1.2 혼합토의 강도 특성 7
• 2.2 중간토의 일반적 특성 8
• 2.2.1 중간토의 특성 8
• 2.2.2 중간토의 세립분 함유율 9
• 2.2.3 중간토의 골격구조 11
• 2.3 애터버그 한계 14
• 2.3.1 액성한계 결정방법 15
• 2.3.2 소성한계 결정방법 18
• Ⅲ. 재료 및 실험방법 19
• 3.1 실험재료 19
• 3.1.1 점토 19
• 3.1.2 사질토 19
• 3.1.3 벤토나이트 20
• 3.2 중간토 제작 방법 22
• 3.2.1 세립분 함유율 설정 22
• 3.2.2 중간토 재성형 23
• 3.2.3 선행압밀압력 기간 결정 25
• 3.3 애터버그 한계 시험 26
• 3.3.1 액성한계 시험 27
• 3.3.2 소성한계 시험 29
• 3.4 압축지수 산정 31
• Ⅳ. 결과 및 분석 32
• 4.1 대상시료의 물리적 특성 32
• 4.2 대상시료의 컨시스턴시 분석 34
• 4.2.1 액소성한계 분석결과 34
• 4.2.2 액성한계 보정 39
• 4.2.3 소성지수 보정 41
• 4.3 현장토의 컨시스턴시 분석 43
• 4.3.1 액소성한계 분석결과 43
• 4.3.2 액성한계 보정 45
• 4.3.3 소성지수 보정 48
• 4.4 압축지수 추정 검토 51
• 4.4.1 액성한계에 따른 압축지수 검토 52
• 4.4.2 소성지수에 따른 압툭지수 검토 56
• Ⅵ. 결론 58
• 참 고 문 헌 61