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| 송도 준설토의 침강 및 압밀특성 |
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윤대호, 김윤태 |
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| Characteristics of Sedimentation and Consolidation for Song-Do Dredged Soil |
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Daeho Yun, Yuntae Kim |
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| Abstract |
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Objective of this paper is to construct a database for the design of reclamation area from experimental results including sedimentation and selfweight consolidation tests and consolidation tests. Dredged soil was taken at Song-Do in Busan. For sedimentation and selfweight consolidation tests, an acrylic cylinder with diameter of 200 mm and height of 1500 mm were used.Settling and consolidation coefficients were obtained from sedimentation and selfweight consolidation test with various drop heights (80 cm, 100 cm, 120 cm), and were compared with other experimental results. Average value of settling and consolidation coefficient was decided as 0.126 cm/min.Settling and consolidation coefficient largely depended on initial water content and silt and clay content.In addition,consolidation tests were performed for three specimens taken attop portion, middle portion and bottom portion of column, respectively, afterself-weight consolidation was completed.Consolidation properties including coefficient of consolidation, compression index and permeability were also obtained and compared with previous results. |
| Key Words:
Dredged soil; Self-weight consolidation; Settling and consolidation coefficient; Standard consolidation test |
| 요지 |
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부산 송도 준설토의 침강 및 자중압밀 특성을 구하고, 침강 및 자중압밀이 완료한 시료에 대해서 표준압밀시험을 수행하여 압밀특성을 분석함으로써 해양준설토를 투기장에 매립할 때 경제적인 설계를 달성하기 위해 필요한 D/B를 마련하고자 한다. 이를 위해 직경 220 mm 높이 1500 mm의 아크릴로 제작된 실린더를 제작하였다. 투기 높이에 따른(80 cm, 100 cm, 120 cm) 침강 및 자중압밀 시험을 통해 침강압밀계수를 산정하였으며, 선행 연구자들의 결과와 비교하였다. 송도 준설토 침강압밀계수의 평균값은 0.126 cm/min으로 나타났으며 침강압밀계수는 점토 함유량이나 초기 함수비에 크게 의존하는 것으로 나타났다. 또한 침강 및 자중압밀이 완료된 시료를 상층부, 중층부, 하층부로 나누어 층별로 시료를 채취하였으며, 표준압밀실험을 실시하여 압밀계수(Cv), 압축지수(Cc), 투수계수를 구함으로써 자중압밀이 완료된 시료의 압밀특성을 알아보았다. |
| 핵심용어:
준설토; 자중압밀; 침강압밀계수; 표준압밀실험 |
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