Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Modification of Bouwer and Rice Method to Evaluate Hydraulic Conductivity of Cutoff Wall Considering Filter Cake Development

수정 Bouwer and Rice 법을 이용한 필터케이크가 존재하는 연직차수벽의 현장 투수계수 산정법

  • Nguyen, The-Bao (School of Civil, Environmental, & Architectural Engrg., Korea Univ.) ;
  • Lee, Chul-Ho (School of Civil, Environmental, & Architectural Engrg., Korea Univ.) ;
  • Kwak, Tae-Hoon (School of Civil, Environmental, & Architectural Engrg., Korea Univ.) ;
  • Choi, Hang-Seok (School of Civil, Environmental, & Architectural Engrg., Korea Univ.)
  • 웽테바오 (고려대학교 건축사회환경시스템공학부) ;
  • 이철호 (고려대학교 건축사회환경시스템공학부) ;
  • 곽태훈 (고려대학교 건축사회환경시스템공학부) ;
  • 최항석 (고려대학교 건축, 사회환경시스템공학부)
  • Received : 2009.09.04
  • Accepted : 2009.12.07
  • Published : 2009.12.31
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Abstract

As a conventional line-fitting method, the Bouwer and Rice method has been popularly adopted to estimate the hydraulic conductivity of an aquifer through a slug test. Because a vertical cutoff wall is usually very compressible and features a small wall thickness, the Bouwer and Rice method should be carefully applied to analyzing slug test results to estimate the hydraulic conductivity of vertical cutoff walls. In addition, a relatively impermeable layer, called a filter cake, formed at the interface between the cutoff wall and the natural soil formation makes it difficult to use the Bouwer and Rice method directly. In order to overcome such limitations, the original Bouwer and Rice method has been modified by incorporating the concept of the flow net method. In this modification, the geometry condition of cutoff walls including the filter cake is effectively considered in evaluating the hydraulic conductivity of a vertical cutoff wall.

순간변위시험(Slug test)을 통해 대수층의 투수계수를 구할 때, 시험결과 해석에 적용하는 line-fitting법 중 가장 일반적인 방법이 Bouwer and Rice법이다. Bouwer and Rice법을 적용하여 압축성이 크고 벽체의 두께가 얇은 연직차수벽의 투수계수를 산정할 때는 세심한 주의가 필요하다. 그리고 연직 차수벽과 주변 지반 사이에 형성된 상대적으로 투수성이 낮은 영역, 즉 필터케이크(Filter cake)는 Bouwer and Rice법을 연직차수벽의 투수계수 산정시, 이 방법을 직접적용하기 어렵게 만든다. 본 논문에서는 기존의 Bouwer and Rice법의 한계를 극복하기 위해서 유선망 개념을 도입한 수정 Bouwer and Rice법을 제안하였다. 수정된 Bouwer and Rice법은 연직차수벽의 투수계수를 산정할 때 필터케이크를 포함한 연직차수벽의 기하학적 조건을 효율적으로 반영할 수 있도록 한다. 또한, 수정 Bouwer and Rice법의 적용성을 검증하기 위한 사례 연구가 본 논문에서 수행되었다.

Keywords

References

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