This research focused on the region of the Eco Delta City Project Site, a site utilization project through the soft ground improvement of the Nakdong River estuary, to identify whether the upper sand deposit has the role of horizontal drainer in the Eco Delta Region.
Firstly, samplingand field and laboratorytests were carried out to identify the physical and mechanical properties of the upper sand deposit. As the results, the distribution depth was 4 to 13 m and the N value ranged from 3 to 12m as the result of standard penetration test, being distributed in much loose state, having good permeability in the permeability test.
In evaluating the possibility of application as horizontal drainer based on the size distribution curve of the upper sand deposit, the fraction of fine particles in some sections is 20% or larger and does not satisfy the horizontal drainer criteria, but satisfies the criteria if the content of fine particles (less than 5%) is low.
GTS NX, an universal analysis program was used to conduct numerical analysis, and the average degree of consolidation of soft ground in case of appling the sand mat and the upper sand deposit were compared. As the results of numerical analysis, the upper sand deposit in the delta region may play similar roles as sand matwhen accumulated to be 2m or more. As a result of the numerical analysis conducted by different the permeability coefficients of the upper sand deposit layer to show the generalized guideline data, it was found that there is a difference according to the permeability coefficient, butthe difference is small when P.V.D is applied.목 차
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List of Figures ⅴ
Abstract ⅸ
1. 서 론 1
1.1 연구의 배경 1
1.2 연구목적 및 범위 3
2. 기존 연구 4
2.1 모래의 투수성 4
2.1.1 투수계수 영향 인자 4
2.1.2 모래의 입도에 의한 수리전도도 산정 경험적 방법 6
2.2 수평배수층 재료 기준 8
2.2.1 국내기준 8
2.2.2 국외기준 10
3. 상부퇴적사질토의 기본적 특성 및 투수특성 11
3.1 조사 및 기본적 특성 11
3.1.1 조사위치 및 방법 11
3.1.2 시추조사 12
3.1.3 표준관입시험 12
3.1.4 분포현황 13
3.2 입도분포 특성 15
3.2.1 입도분포 15
3.2.2 비교 분석 16
3.3 투수특성 19
3.3.1 투수시험 개요 19
3.3.2 시료조성 22
3.3.3 현장투수시험 결과 23
3.3.4 실내투수시험 결과 24
3.3.5 비교 분석 25
4. 압밀 이론 고찰 27
4.1 기본개념 27
4.2 수정 Cam-Clay 모델 29
5. 수치 해석을 통한 상부퇴적사질토의 통수능 평가 33
5.1 적용 프로그램 33
5.1.1 프로그램 검증 35
5.2 해석조건 및 내용 39
5.2.1 해석조건 39
5.2.2 해석개요 43
5.3 해석 결과 및 고찰 43
5.3.1 통수능을 고려한 Sand Mat의 두께 적절성 검증 43
5.3.2 해석결과 45
6. 결론 56
참고문헌 58
감사의 글 60Maste
