베인시험기를 이용한 낙동강모래의 마찰각에 관한 연구 = Vane Shear Test on Nakdong River sand

다국어 초록 (Multilingual Abstract)

vane shear test (VST) is a simple testing method for determining an undrained shear strength of cohesive soils by minimizing soil disturbance. In this study, the VST was used to determine a shear strength of sand. Dry Nakdong River sand was prepared for loose and dense conditions in a cell and then pressurized with 25, 50, 75 or 100 kPa from the surface of sand. A vane was rotated and a torque was measured within sand. When a torque moment by vane and friction resistance moment by sand is assumed to be equalized, a friction angle can be obtained. When a vane rotates within clay, a uniform undrained shear strength is assumed to be acting on cylindrical failure surface or other faillure surface. On the other hand, when it is applied for sand, the failure shape can be assumed to be an octagonal or square column or modified failure surface. The relationship between measured torque and resistant force along assumed failure shapes due to friction of sand was derived and the internal friction angle of sand was determined for loose and dense conditions. For the same soil condition, a series of direct shear test was carried out and compared with VST result. This is similar to those of direct shear tests.

목차 (Table of Contents)

• 제 1 장 서 론 1
• 1.1. 연구배경 및 동향 1
• 1.2. 연구내용 2
• 제 2 장 베인 시험 3
• 2.1. 베인시험의 원리 3
• 2.2. 베인시험 사질토 적용 사례 5
• 2.3. 사질토 적용을 위한 해석방법 6
• 제 3 장 낙동강모래에 대한 베인시험 12
• 3.1. 검증 12
• 3.1.1. 토크센서 검증 13
• 3.1.2. 로드셀 검증 16
• 3.2. 실험 장비 소개 및 설치 21
• 3.2.1. 베인 날개 제작 21
• 3.2.2. 모터 설치 22
• 3.2.3. 실험 지지대 제작 및 설치 26
• 3.2.4. 데이터 로그 28
• 3.2.5. 상재하중 가하는 시스템 30
• 3.3. 실험 방법 소개 33
• 3.4. 베인시험 결과 및 분석 35
• 3.5. 직접전단시험 결과 및 분석 56
• 제 4 장 사질토 적용을 위한 베인시험방법 제안 58
• 4.1. O type 베인 파괴면 58
• 4.2. S type 베인 파괴면 63
• 4.2. C type 베인 파괴면 65
• 4.3. D type 베인 파괴면 68
• 제 5 장 결론 77
• 참고문헌 80
• Abstract 82