초록

본 연구는 해역특성에 적합한 위해요소를 분석하여 천해역에 설치되는 해저케이블 보호설비에 대한 안전성 평가를 수행하였다. 또한 해저케이블 설치, 시공 및 설계분야의 성장 단계인 국내 실정의 기술력 확보를 위하여, 보호설비에 대한 안전성 평가지침 기술개발을 수행하였으며, 해저케이블 보호설비 설계에 대한 기준을 제시하였다.

Abstract ▼

In this study, we analyzed hazards and treat elements of shallow water part of area in Korea, and conducted safety
assessment about submarine cable protection facilities. In order to achievement of advanced technology for the submarine cable division, we make and develop guideline for the submari

In this study, we analyzed hazards and treat elements of shallow water part of area in Korea, and conducted safety
assessment about submarine cable protection facilities. In order to achievement of advanced technology for the submarine cable division, we make and develop guideline for the submarine cable protection facilities design and engineering. The first year, we research the case study of information and guidelines about submarine cable and its protection facilities. In this use, it was made a database of the hazard and treat elements, external conditions and protection facilities and applied safety assessment. First, we have established to the database of the submarine cable protection facilities. It is separated to the objects of dropping and dragging by anchor and unclassified type. Protection facilities for the drop objects are classified both contacted and not contacted in submarine cable. And protection facilities for the anchor drag are separated penetration depth of anchor drag, flexible type and type of the passed protection facilities by anchor. Also, other protection facilities with unclassified type are special purposed protection facilities for scouring and crossing. The natural hazards influence on the submarine cable are damage factors of the marine environment such as tide, tidal current and wave. It is surely to be considered elements and marine conditions when designed protection facilities. The human hazards are separated by fishing gear and anchors of ship. The damage factors caused by the fishing gear are tree and iron pole for construction of the fishing farm, shrimp of trawl and Ankangmang anchor. Another human hazards are main used stock and stockless anchor. In applicable design guidelines for domestic and international submarine cable protection facilities, design guideline of port and fishing port in domestic and DNV, FL and API in international are published. Such guidelines for the submarine cable protection facilities are insufficient, and design guidelines for the areas such as subsea pipeline design guidelines similar cases.
To take advantage of the research results of the first year to the second year, to carry out technology development and hydraulic experiment of elements for marine environment. First, rock-berms, stone-bag and A -ducts were selected as the target structures. Anchor collision and dragging was selected as the hazardous activity. Second, the drag coefficients of the anchors were obtained using a computational fluid dynamics package ANSYS-CFX, to calculate the terminal velocities of the five anchors (stock anchor: 1, 2-ton, stockless anchor: 2, 4.89, 10.5-ton). Finally, the anchor collision and dragging of the target structures was performed by a general purpose finite element package ANSYS AUTODYN. The rock berm and stone bag were modeled by the piecewise Drucker-Prager material model and analyzed by the smooth-particle hydrodynamics (SPH) method. The A-duct was modeled by the RHT concrete model and analyzed by the Lagrange-based finite element method.
For the analyses, type of anchor, collision location and dragging velocity were considered to investigate the response characteristics. Stability analysis was carried out based on the response of the submarine power cable protection structure.
Also, results of the hydraulic experiment for the marine environmental damage factor are following. Experimental conditions(incident wave condition, structure condition) are as follow. Water depth is 20 m, 12.5 m for stability experiment which is representative water depth in shallow water. Experiment flume is 1.0m width, 1.0m height, 35.0m long, incident wave period has the range 0.7 sec to 2.:1 sec‘ and wave steepness (H/Lo) changed 0.001 Lo 0.028. The model structure installed 3 different angle(90° , 45° , 0°) and analyse the scour and equilibrium beach profiles using the representative grain diameter of bottom is 0.18 mm. Experiment time of each case is 3 hours which is the duration time of Typhoon, The ratio of Maximum wave height and significant wave height(H_max/H_1/3) has the range 1.2 to 2.2. From the results of stability experiment, A -duct is instability in the breaking wave condition and Stone bag is stability in most cases.
Rock berm is instability at the upper part of structure. The water tank is 2.4 m height, 0.7 m width for drop characteristics experiment and model anker producted 1/10 size of prototype. From the results of drop characteristics experiment, the drop speed of anker increased during each experiment and maximum speed is 2.0 m/sec. primary and secondary based on these results, by sea/regional protection facilities provide guideline for the safety assessment manual is written. Protection facilities due to the guidelines technology developed technology for more than 95% compared with developed country that in the short term boost to the selection of grid - based technology is possible. In addition to Europe, America and Asia for the design of a grid-connected business advisory due lo manual export and commercialization of grid technology in the field of the possible, area characteristics and external conditions, and review of proposals for appropriate protection equipment is possible.

목차 Contents

• 표지 ... 1
• 제출문 ... 2
• 보고서 요약서 ... 3
• 요약문 ... 4
• SUMMARY ... 7
• 목차 ... 10
• 제 1 장 연구개발과제의 개요 ... 15
• 1절 연구배경 정의 ... 15
• 1. 일반 현황 ... 15
• 2절 연구목적 ... 17
• 1. 기술적 측면 ... 17
• 2. 경제 · 산업적 측면 ... 17
• 3. 사회·문화적 측면 ... 17
• 4. 해저케이블 보호설비 안전성 평가 기술의 필요성 ... 17
• 3절. 연구개발 목표 및 내용 ... 19
• 1. 연구개발 최종목표 ... 19
• 2. 연차별 연구목표 및 내용 ... 20
• 제 2장. 해저케이블 보호설비의 기반 및 설계기술 연구 ... 21
• 1절. 해저케이블 보호설비의 시공사례 분석 ... 21
• 1. 해저케이블 ... 21
• 2. 해저케이블 보호설비 ... 41
• 2절. 국내 해저케이블 보호설비 설계지침 사례 ... 58
• 1. 국내 해저케이블 보호설비 설계지침 사례 ... 58
• 2. 국외 해저케이블 보호설비 설계지침 사례 ... 60
• 3. 국외 해저케이블 적용가능 설계지침 요약 ... 68
• 3절 외력조건 산정 및 database 구축 ... 69
• 1. 해저케이블 보호설비 database ... 69
• 2. 대상해역의 자연적 위해요소 database ... 70
• 3. 대상해역의 인위적 위해요소 database ... 71
• 4절. 해역특성에 따른 위해요소 분석 ... 72
• 1. 개요 ... 72
• 2. 자연적 위해요소 분석 ... 73
• 3. 인위적 위해요소 ... 97
• 5절. 천해 설계파랑 산출 해석 ... 111
• 1. 천해 설계파랑 산출 시뮬레이션 ... 111
• 2. 천해 설계파랑 산출 시뮬레이션 결과 ... 115
• 6절 수리모형실험에 대한 화상해석기법의 시스템 구축 ... 120
• 1. 화상해석기법 시스템의 개요 ... 120
• 2. 화상해석기법을 위한 실험장비 및 방법 ... 121
• 제 3장 해저케이블 보호설비의 안전성 평가지침 개발 ... 125
• 1절 보호설비 구조해석 및 역학적 특성 분석 ... 125
• 1. 해저케이블 보호설비의 구조해석 ... 125
• 2. A-duct의 앵커 충돌해석 ... 139
• 3. Rock berm 충돌해석 ... 161
• 4. Stone bag의 앵커 충돌해석 ... 176
• 5. A-duct의 앵커 끌림 해석 ... 183
• 6. Rock berm의 앵커 끌림 해석 ... 196
• 7. Stone bag의 앵커 끌림 해석 ... 212
• 8. 결론 ... 223
• 2절 보호설비의 수리 역학적 특성 분석 ... 226
• 1. 실험 장치 및 계측기기 ... 226
• 2. 실험 축척 및 상사율 ... 229
• 3. 예비실험 ... 231
• 4. 모형실험 및 방법 ... 244
• 5. 실험결과 및 분석 ... 248
• 3절 위해요소에 대한 투하 실험 ... 287
• 1. 실험조건 ... 287
• 2. 실험결과 및 분석 ... 290
• 4절 해저케이블 보호설비 안정성 평가 소프트웨어 개발 ... 297
• 1. 서론 ... 297
• 2. 수리모형실험 ... 298
• 3. 해저케이블 보호설비 파랑에너지 안정성 평가 절차 ... 300
• 4. 해저케이블 보호설비 파랑에너지 안정성 평가 결과 ... 303
• 5. 해저케이블 보호설비 안정성 평가 소프트웨어 ... 311
• 제4장 참고문헌 ... 314
• 끝페이지 ... 317