표제지
초록
목차
1. 서론 9
1.1. 연구 배경 9
1.2. 연구 사례 11
1.2.1. 해저면 이탈력에 관한 실험적 연구 11
1.2.2. 해저면 이탈력 추정식 및 이를 활용한 연구 12
1.2.3. 해저면 지지력에 관한 연구 14
1.2.4. 침강시간에 따른 해저면 이탈력에 관한 연구 16
1.3. 연구 목표 및 연구 내용 17
2. 연구방법 18
2.1. 모형실험 장비 18
2.2. 실험 시료 20
2.3. 실험 모델 22
2.4. 신호 처리 및 센서 캘리브레이션 26
2.5. 인양 케이블의 선정 28
3. 모형실험 31
3.1. 단순형상 구조물 31
3.2. 선박형상 구조물 36
3.3. 모형실험의 분산성 39
4. 결과분석 및 논의 43
4.1. 물체의 형상의 영향 43
4.2. 침몰 자세의 영향 48
4.3. 해저 저질의 영향 51
4.4. 인양 속도의 영향 56
4.5. 침몰 시간의 영향 60
5. 요약 및 결론 63
참고문헌 65
Abstract 68
Table 1.1. Contents of experiment parameters 11
Table 1.2. Estimation of bottom breakout force by David& Diane (1985) 12
Table 2.1. List of experimental equipment 19
Table 2.2. Properties of seabed soil 20
Table 2.3. Principle parameter of experimental model (Simple shaped) 23
Table 2.4. Principle parameter of experimental model (Ship shaped) 25
Table 3.1. Soil breakout force of Cube8, D/B≈0.3 41
Table 4.1. Shape coefficient of simple shaped model 45
Table 4.2. Shape coefficient and Block coefficient of test model 47
Table 4.3. Coefficient of determination of experimental results 51
Table 4.4. Effect of seabed soil on shape coefficient 55
Table 4.5. Lifting speed of prism model and prototype vessel 56
Table 4.6. Comparison of lifting speed coefficient 59
Table 4.7. Vane shear test results of Torvane 61
Figure 1.1. Occurrences of ship sinking accidents in Korea 10
Figure 1.2. Schematic diagram of salvage process 10
Figure 1.3. Schematic diagram of bearing capacity (Fq)[이미지참조] 14
Figure 2.1. Configuration of experimental setup 18
Figure 2.2. Overview of site A and B for seabed soil gathering 21
Figure 2.3. Experimental model (Simple shaped) 22
Figure 2.4. Experimental model (Ship shaped) 24
Figure 2.5. Calibration of loadcell 26
Figure 2.6. Example of filtered data 27
Figure 2.7. Effect of lifting line 28
Figure 2.8. Effect of lifting line (Time series) 29
Figure 2.9. Comparison of lifting line 30
Figure 3.1. Experimental scene of simple shaped model 32
Figure 3.2. Schematic view of soil breakout process of cube 33
Figure 3.3. Experimental results of simple shaped model 35
Figure 3.4. Experimental scene of ship shaped model 37
Figure 3.5. Experimental results and shape coeffcient of ship model 38
Figure 3.6. Comparison of experimental results with Muga(1968), Liu(1969) and Lee(1972) 40
Figure 3.7. Experimental scene of Cube8, D/B≈0.3 with Seabed soil A 41
Figure 3.8. Time series of Cube8, D/B≈0.3 41
Figure 4.1. Application of shape coefficient(Cₛ) 44
Figure 4.2. Effect of shape coefficient on ship model 46
Figure 4.3. Examples for sunken posture of ship model 48
Figure 4.4. Effect of sinking posture of ship model 49
Figure 4.5. Bottom breakout scene of sunken ship in trimmed posture 50
Figure 4.6. Effect of seabed soil 52
Figure 4.7. Experimental model and considered Barge in Length of 20m 56
Figure 4.8. Effect of lifting speed 58
Figure 4.9. Image of Torvane 60
Figure 4.10. Vane shear test results of Torvane(Exp. Scene) 61
Figure 4.11. Effect of In-situ rest time 62