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제주 외항 지역 항만 구조물의 침하분석

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Alternative Title
Subsidence Analysis of West Breakwater Construction of Jeju Harbor
Abstract
On Jeju Island as a whole, the use of port facilities has been increased. Therefore, massive construction projects of port facilities at Jeju Harbor, LNG base, and Jeju Naval base are underway or planned on the sand layers surrounding them. Effects of settlement have been investigated by researchers; however, there have not been sufficient studies. The research of the real port facilities requires further research with respect to both settlement and settlement trends. Analysis and rating of settlement for these special areas require extra studies to be conducted. Accordingly, the main objectives of this study are to investigate the settlement trends and suggest the characteristics of settlement on the ground and the bearing layer in Jeju Harbor during the construction period. The scope of this study is limited to Jeju Harbor, as it is typical of the Jeju harbor ports. In this study, the formulas for settlements on sandy soil are from Schmertmann and Hartman(1978) and B. K. Hough, DeBeer, and Terzaghi. Also, one of the largely applied formulas for the riprap bed's layer is a formula modified from Terzaghi. The application of these equations, however, has been limited. Therefore, there is a need for a method that can reflect the effects on Jeju harbor's settlement.
The physical features of Jeju Harbor are that the diameter of grains of sand ranges from mainly 0.1-1mm. Chemically the harbor contains Analcime and Calcite, which are featured in carbonate sand, and Feldspar, which is featured in silica sand. These chemicals were evenly detected as a result of the XRD test. Also XRF test shows the features of the silica sand's features that are Sio2, Al2O3, Fe2O3, CaO, LOI, etc, and in the SEM scan results, the sand is angular and has high porosity. Under the condition of a relative density of 75%, the pre-consolidation index is 40 t/m2 and the compression index is measured at 0.116. In the results of the trial compression test, the angle of internal friction is mainly 34°~38°. According to grain size analysis, the testing suggests that compressed sand tends to have smaller grains than the uncompressed sand. It is highly indicated that stones to be used in Jeju harbor construction have many levels of porosity, which lead to rearrangement through porosity destruction. The sand layer near Jeju harbor is thinner and the riprap bed's layer rate is thicker, but it has been found that the sand layer rate becomes thicker going in the direction of the deep ocean. According to the results of the settlement of the depths of the ground and bearing layer, the final settlement depths and periods increase as the total depth of ripraps bed's and sand layers rise. On one hand, the shallow sand layers and a high depth of riprap bed's sand layers make or depths and periods decrease. However, a higher depth of sand increases the settlement period. Furthermore, when the total depth of riprap bed's and sand layer is higher, the settlement rate will be increased. In the results of the settlement trends analysis, the total depth of ripaps bed's and sand layers ranged from a minimum of 2.4% to a maximum 3.6%. In conclusion, the preceding relationships and observations can be applied to estimate the settlement levels and periods in the Jeju Harbor construction
Author(s)
이원민
Issued Date
2011
Awarded Date
2011. 8
Type
Dissertation
URI
http://dcoll.jejunu.ac.kr/jsp/common/DcLoOrgPer.jsp?sItemId=000000005536
Alternative Author(s)
Lee, Won-Min
Affiliation
제주대학교
Department
산업대학원 토목공학전공
Advisor
이병걸
Table Of Contents
I. 서 론 1
1. 연구배경 1
2. 연구목적 2

II. 기존 이론 3
1. 사질토의 일반적인 특징 3
1) 사질토의 압축성 3
2) 즉시침하량 산출방법 6
2. 사질토의 일반적인 특징 7
1) Schmertmann & Hartman (1978) 7
2) B. K. Hough 8
3) DeBeer(1967) 9
4) Buisman-DeBeer(1952) 10
5) Terzaghi & Peck(1967) 10
6) Meyerhof(1974) 10
7) Bowles(1977) 11
3. 사석의 침하량 산정 11

III. 제주외항 모래의 공학적 특성 13
1. 제주도 모래의 특성 13
2. 제주외항 모래의 물리 및 화학적 특성 14
1) 물리적 특성 14
2) 화학적 특성 16
3. 제주외항 모래의 압축특성 17
1) 시험장비 18
2) 공시체 제작 및 시험방법 19
3) 시험결과 19
4. 제주외항 모래의 전단강도 특성 24
5. 제주외항 모래의 파쇄 특성 29
6. 제주도 사석의 특성 30


IV. 제주외항 항만구조물 침하경향 31
1. 1구간 침하경향 32
2. 2구간 침하경향 34
3. 3구간 침하경향 36
4. 4구간 침하경향 38
5. 침하 분석 40
1) 모래층 및 사석층의 두께에 따른 침하 분석 40
2) 사석층의 두께에 따른 침하 분석 42
3) 모래층의 두께에 따른 침하 분석 44
4) 비교 분석 46


V. 결 론 48

VI. 참고 문헌 50
Degree
Master
Publisher
제주대학교 산업대학원
Citation
이원민. (2011). 제주 외항 지역 항만 구조물의 침하분석
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