표제지
요약문
Abstract
목차
용어정리 16
1. 서론 18
2. 문헌 연구 25
2.1. 국내 가스 폭발 연구 현황 25
2.2. 국외 가스 폭발 연구 현황 28
3. 이론 배경 32
3.1. 가스 폭발의 정의 32
3.2. 혼합가스 폭발 36
3.3. TNT 등가량 38
3.3.1. 개요 38
3.3.2. TNT 38
3.6.3. TNT 등가량의 정의 39
3.4. 혼합가스의 TNT 등가량 환산 방법 42
3.5. 폭발파의 정의 45
3.5.1. 양압구간에서의 압력변화 47
3.5.2. 음압구간에서의 압력변화 52
3.6. 지하 암반의 폭발파 전파 양상 54
3.7. 폭발에 의한 암반의 파괴과정 56
3.8. AUTODYN을 이용한 해석 56
3.8.1. AUTODYN 개요 56
3.8.2. AUTODYN 해석 이론 57
3.8.3. AUTODYN 해석 모델 63
4. AUTODYN을 이용한 수치해석 66
4.1. 연구 방법 66
4.2. 모델링 구성 및 해석 물성치 산정 67
4.2.1. 모델링 구성 67
4.2.2. 해석 물성치 산정 69
4.3. AUTODYN의 경계조건 72
4.3.1. AUTODYN에 사용한 경계조건과 측정 지점 72
4.4. 모델링 결과 73
5. 지하구조물의 폭발 영향 민감도분석 86
5.1. 개요 86
5.2. 부분요인배치법 86
5.3. 민감도분석 결과 87
5.4. 각 인자에 따른 지하구조물의 폭발 영향 90
6. 결론 92
참고 문헌 94
Appendices 102
Appendix A. 64 cases for 28-2 fractional factorial design[이미지참조] 102
Appendix B. Magnitude of the maximum and minimum stresses and the location of the stresses from 64 cases 105
Table 1. Development of underground spaces and road undergrounding... 19
Table 2. Status of domestic explosion accidents 21
Table 3. Status of explosion accidents abroad 22
Table 4. Explosion range of combustible gases (298K, 1atm) 35
Table 5. TNT equivalence of commercially available explosives 41
Table 6. Empirical equations for the arrive time 47
Table 7. Parameters for estimating Kingery and Pannill time of arrival 48
Table 8. Parameters for estimating Kinney and Graham time of arrival 48
Table 9. Empirical equations for the peak overpressure 49
Table 10. Empirical equations for the duration of positive pressure 50
Table 11. Empirical equations for the positive impulse 51
Table 12. Empirical equations for the decay constant 51
Table 13. Empirical equations for the minimum overpressure 53
Table 14. Empirical equations for the duration of negative pressure 53
Table 15. TNT parameter in AUTODYN 65
Table 16. Air patameters used in AUTODYN 65
Table 17. Material properties and the initial conditions used in AUTODYN modeling 70
Table 18. Factors and levels for sensitivity analysis 71
Table 19. Cases for AUTODYN modeling 74
Table 20. AUTODYN explosive modeling results by case 85
Table 21. Main effect of the parameters from the sensitivity analysis 88
Table 22. Interaction effect between parameters from the sensitivity analysis 89
Table 23. Summary of the sensitivity analysis 91
Fig. 1. Increase in the number of tunnels over 10 years 18
Fig. 2. Before and after the Beirut explosion in Lebanon 20
Fig. 3. Safe horizontal distance for undamaged buildings 29
Fig. 4. Triangle of explosion 32
Fig. 5. An event tree showing typical consequences of accidental... 33
Fig. 6. The effect of temperature LFL and UFL of flammable gases 37
Fig. 7. Variation of TNT equivalent with the variation of volume percentage... 43
Fig. 8. Variation of TNT equivalent for the variation of CO content in three... 44
Fig. 9. Variation of TNT equivalent for the variation of C₂H₄ content in three... 44
Fig. 10. Pressure-time history of air blast 46
Fig. 11. Factors affecting the destruction of underground structures 55
Fig. 12. Euler solver 58
Fig. 13. Lagrange solver 59
Fig. 14. Examples of Lagrange and Euler simulations on an impact problem 59
Fig. 15. Examples of Lagrange/Lagrange interaction and Euler/Lagrange... 61
Fig. 16. Interaction with eroded nodes 63
Fig. 17. Flowchart for conducting the analysis in this study 66
Fig. 18. Feature of the model for sensitivity analysis 68
Fig. 19. Mesh for the AUTODYN simulation 68
Fig. 20. Boundary condition and measuring points in the AUTODYN modeling 73
Fig. 21. Variation of σx with time at the measuring points in case A[이미지참조] 75
Fig. 22. Variation of σy with time at the measuring points in case A[이미지참조] 75
Fig. 23. Variation oi σ1 with time at the measuring points in case A[이미지참조] 76
Fig. 24. Blast wave propagation in case A at (a) 1ms, (b) 5ms, (c) 10ms... 77
Fig. 25. σx propagation in case A at (a) 1ms, (b) 5ms, (c) 10ms...[이미지참조] 78
Fig. 26. σx propagation in case B at (a) 1ms, (b) 5ms, (c) 10ms...[이미지참조] 79
Fig. 27. σx propagation in case C at (a) 1ms, (b) 5ms, (c) 10ms...[이미지참조] 80
Fig. 28. Variation of σx at the gauges with time in case B[이미지참조] 81
Fig. 29. Variation of σy at the gauges with time in case B[이미지참조] 82
Fig. 30. Variation of σ1 at the gauges with time in case B[이미지참조] 82
Fig. 31. Variation of σx at the gauges with time in case C[이미지참조] 83
Fig. 32. Variation of σy at the gauges with time in case C[이미지참조] 83
Fig. 33. Variation of σ1 at the gauges with time in case C[이미지참조] 84