지진규모에 따른 방파제 안정성에 관한 연구
- Alternative Title
- Stability Analysis of the Structure of Breakwater in Seismic Magnitude
- Abstract
- Dynamic analysis of stability for the rubble mound breakwater structure has performed with using 16 different seismic waves of 5.3 ～ 7.9 in magnitude of earthquake to assess the possibility of liquefaction in the foundation area under the breakwater structure. And the horizontal displacements of the breakwater for the same 4 types of seismic waves have also been analyzed by using PLAXIS 2D electronic computer program of finite element method in two cases of the change of SPT N-values in the sand replaced as the foundation area of the breakwater structure and the change of the width and height in dimension of the breakwater.
The results are summarized as follows.
Seed & Idriss, Modified Seed & Idriss and Eurocode methods have been used to perform the liquefaction assessment in the central part of sand and in the edged part of sand below the breakwater. As a result, the surface maximum acceleration showed the range of 0.07g to o.112g in the central part and 0.077g to 0.177g in the edge part, respectively.
The assessment for liquefaction performed on the foundation area under the breakwater structure has shown no possibility of liquefaction occurrence because the factor of safety by the detailed prediction method appeared to be above 1.0 of the specification’s regulation.
The horizontal displacement of the breakwater structure has also been calculated by means of the numerical analysis. In the case of the foundation area consisting of clayey soil under the breakwater, the increase in horizontal displacement was identified as the magnitude of earthquake increased, and when the height(H) of the breakwater structure was constant, the horizontal displacement increased as the ratio(W/H) of the width increased, and also, in the case of constant width ratio(W/H), the horizontal displacement also increased as the height of the breakwater increased.
The variation of the horizontal displacement with the change in the N-value of foundation area replaced by sand under the breakwater structure was analyzed. The N-values of the sand used in the analysis were N=5, 15, 25, and the sand layer has been considered to be replaced to the depth(D) of half the height(H) of breakwater. As a result of analysis, the horizontal displacement of the breakwater structure decreased as the N-value increased.
And in the case of the ratio of width to height(W/H) of breakwater keeping constant, the horizontal displacement increased as the breakwater height(H) increased, and also, when the breakwater structure height(H) is constant, the horizontal displacement also increased as the breakwater width(W) increased.
- Issued Date
- 2014
- Awarded Date
- 2014. 8
- Type
- Dissertation
- Publisher
- 부경대학교
- Affiliation
- 대학원
- Department
- 대학원 토목공학과
- Advisor
- 정진호
- Table Of Contents
- List of Tables.........................................................................................iii
List of Figures.......................................................................................vi
List of Symbols....................................................................................xii
Abstract......................................................................................................xiii
1. 서론.............................................................................................................1
1.1 연구배경 및 목적......................................................................................1
1.2 국내외 연구동향........................................................................................3
1.3 연구방법 및 범위......................................................................................6
2. 이론적 고찰..........................................................................................10
2.1 방파제 형식 및 특징..............................................................................10
2.2 지진운동....................................................................................................14
2.3 지진에 의한 지반의 거동......................................................................21
2.4 액상화 현상..............................................................................................29
2.5 내진 설계기준..........................................................................................49
3. 방파제 구조물의 기초지반에 대한 동적 안정성 평가..............................................................................................................62
3.1 대상지반...................................................................................................62
3.2 연구대상 기초지반의 동적 특성치 분석 및설계정수 산정.............................................................................................................63
3.3 지진규모에 따른 지진특성 분석.......................................................74
3.4 방파제 기초 지반의 액상화 평가.....................................................88
3.5 소결.........................................................................................................101
4. 방파제 구조물의 동적 수평변위 분석...........................104
4.1 지진규모별 방파제 수평변위 검토................................................104
4.2 방파제 기초 지반의 N치 변화에 따른 동적 수평변위 검토........................................................................................................110
4.3 방파제 단면 변화에 따른 동적 수평변위 검토..........................122
4.4 소결.........................................................................................................133
5. 결론........................................................................................................135
참고문헌.....................................................................................................137
- Degree
- Doctor
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