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A Study of Consolidation Behavior of Clay Ground with Partially Penetrated PVD under Artesian Pressure

연직배수재가 부분 관입된 점토지반의 피압에 따른 압밀 거동에 관한 연구

Daeho Yun1
,
Nguyen Ba Phu2
,
Jaehong Kim3
,
Yuntae Kim4*
윤 대호1
,
Phu Nguyen Ba2
,
김 재홍3
,
김 윤태4*
1Graduated student, Department of Ocean engineering, Pukyong National University
2Graduated student, Department of Ocean engineering, Pukyong National University
3Senior researcher, Infrastructure research center, Korea Water Resources Corporation
4Professor, Department of Ocean Engineering, Pukyong National University
*교신저자. *Corresponding Author. 
30 March 2016. pp. 47-57
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Abstract

Many researchers reported that artesian pressure exists in thick soft ground of Busan Nakdong river estuary. Artesian pressure in soft ground could affect rate of consolidation, settlement and drainage capasity of prefabricated vertical drain(PVD). This paper investigated consolidation behaviors of soft ground with partially penetrated PVD subjected to artesian pressure. Laboratory tests with 1-dimensional large column equipment and their numerical analyses were carried out. Test results showed that the consolidation settlement of clay ground with artesian pressure was higher than that without artesian pressure. Due to artesian pressure, the dissipation rate of excess pore water pressure was reduced in soft ground with artesian pressure, especially at bottom part of clay ground. Numerical results were in good agreement with experimental test results.

Keywords
Consolidation
Artesian pressure
Vertical drain
Clay ground

부산 낙동강 하구 대심도 연약지반 아래에 피압대수층이 존재한다는 것이 많은 연구자들에 의해 관측되었다. 연약지반에 작용하는 피압은 압밀 속도, 압밀 침하량, 연직배수재의 성능 등에 영향을 줄 수 있다. 따라서 본 연구에서는 피압의 작용 유·무에 따른 연직배수재가 부분 관입된 점토지반의 압밀 거동을 분석하였다. 연구를 수행하기 위해 일차원 대형 컬럼 장비를 이용한 실내실험과 유한요소 해석을 실시하였다. 실험 결과 피압이 작용하는 점토지반의 압밀 침하가 피압이 작용하지 않는 점토지반보다 더 크게 나타났으며, 과잉간극수압의 소산 속도는 더디게 나타났다. 또한 동일한 지반 조건을 이용하여 유한요소해석을 수행한 결과 실내 실험과 유사한 경향을 나타내었다.

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Information
  • Publisher :Korean Geosythetics Society
  • Publisher(Ko) :한국지반신소재학회
  • Journal Title :Journal of the Korean Geosynthetics Society
  • Journal Title(Ko) :한국지반신소재학회 논문집
  • Volume : 15
  • No :1
  • Pages :47-57
  • Received Date : 2015-01-19
  • Revised Date : 2016-03-22
  • Accepted Date : 2016-03-23
  • DOI :https://doi.org/10.12814/jkgss.2016.15.1.047
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