목차

List of Tables ··············································································································· ⅳ
List of Figures ············································································································· ⅴ
Abstract ························································································································· ⅶ
초록 ································································································································ ⅸ
제 1 장 서 론 ·············································································································· 1
1.1 연구 배경 ······································································································ 1
1.2 연구 동향 ······································································································ 2
1.2.1 해저지반 열전도율 산정 ································································· 2
1.2.2 다층지반을 고려한 총괄열전달계수식 제안 ······························· 3
제 2 장 해저지반 열전도율 산정 실내모형실험 ·················································· 5
2.1 실내모형실험 방법 ······················································································ 5
2.1.1 실내모형실험 장치 ··········································································· 5
2.1.2 실내모형실험 측정 장비 ································································· 7
2.1.3 실내모형실험 방법 ··········································································· 8
2.1.4 실내모형실험 시료 ········································································· 10
2.2 실내모형실험 결과 ···················································································· 12
2.2.1 혼합시료 열전도율 결과 ······························································· 12
2.2.2 보링시료 열전도율 결과 ······························································· 18
제 3 장 해저지반 열전도율 산정 유한요소해석 수행결과 및 분석 ·············· 20
3.1 유한요소해석 타당성 검토 ······································································ 20
3.2 유한요소해석 방법 ···················································································· 22
3.2.1 모델링 및 격자생성 ······································································· 23
3.2.2 유한요소해석 지배방정식 ····························································· 24
3.2.3 유한요소해석 초기조건 및 경계조건 ········································· 25
3.2.4 유한요소해석 항목 및 재료 물성치 ··········································· 25
3.3 실내모형실험 및 유한요소해석 결과비교 및 분석 ···························· 26
3.3.1 유한요소해석 및 실내모형실험 결과 ········································· 26
3.3.2 유한요소해석 및 실내모형실험 결과 비교 ······························· 27
제 4 장 다층지반의 열전도율을 고려한 총괄열전달계수식 제안 ·················· 30
4.1 총괄열전달계수 이론식 검토 ·································································· 30
4.1.1 총괄열전달계수 개념 ····································································· 30
4.1.2 매립된 해저배관의 총괄열전달계수 이론식 ····························· 30
4.2 다층지반 열전도율 적용 이론 및 식 제안 ·········································· 36
4.2.1 Fourier의 열전도법칙 ····································································· 36
4.2.2 해저지반 등가 열전도율 산정 ····················································· 38
4.2.3 다층지반을 고려한 총괄열전달계수 계산식 ····························· 39
제 5 장 유한요소해석을 통한 제안 식 검증 ······················································ 42
5.1 유한요소해석 방법 ······················································································42
5.1.1 유한요소해석 방법 ········································································· 42
5.1.2 유한요소해석 지배방정식 ····························································· 44
5.1.3 유한요소해석 초기조건 및 경계조건 ········································· 46
5.1.4 수치해석 결과를 이용한 총괄열전달계수 계산 이론 ··········· 48
5.2 유한요소해석 케이스 ·············································································· 49
5.2.1 해석케이스 1 : High Biot number ·············································· 50
5.2.2 해석케이스 2 : Intermediate Biot number ································ 51
5.2.3 해석케이스 3 : Law Biot number ··············································· 52
제 6 장 유한요소해석 수행결과 및 분석 ···························································· 53
6.1 유한요소해석 타당성 검토 ······································································ 53
6.2 유한요소해석 결과 및 제안 식 계산결과 비교분석 ·························· 55
6.2.1 해석케이스 1 : High Biot Number ·············································· 55
6.2.2 해석케이스 2 : Intermediate Biot Number ······························· 58
6.2.3 해석케이스 3 : Law Biot Number ·············································· 61
제 7 장 결 론 ············································································································ 64
Nomenclature ············································································································· 66
참고문헌 ······················································································································ 68