Journal of the Korean GEO-environmental Society (한국지반환경공학회 논문집)

Korean Geo-Environmental Society (한국지반환경공학회)
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A Study on the Interface Shear Strength of HDPE Textured Geomembrane

HDPE 표면처리 지오멤브레인의 경계면 전단강도에 관한 연구

  • Kim, Sejin (Department of Civil Engineering, Hongik University) ;
  • Youn, Heejung (Department of Civil Engineering, Hongik University)
  • Received : 2015.12.16
  • Accepted : 2016.01.22
  • Published : 2016.02.01
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Abstract

This paper evaluates the interface shear strength of HDPE textured geomembrane. The interface shear strength between textured geomembrane and marl, and textured geomembrane and woven geotextile were measured; and the smooth geomembrane was used to evaluate the effect of "texture" on the interface shear strength. The interface shear strength was measured using a large direct shear testing device under several conditions including the presence of water, and the normal stresses that were 12, 24, 45, 100, 500, and 1,000 kPa. From testing results, it was found that there was meaningful reduction in the interface shear strength in the presence of water, but the effect of normal stress was not clear. The interface shear strength was measured to be significantly different for smooth geomembrane, whose strength was measured to be as small as half that of the textured geomembrane.

본 논문에서는 HDPE 표면처리(textured) 지오멤브레인의 경계면 전단거동을 파악하고자 하였다. 표면처리 지오멤브레인과 marl, 그리고 직포(woven geotextile)와의 경계면에서 발생하는 경계면 전단강도를 측정하였으며, 표면처리의 영향을 파악하기 위해 매끈한(smooth) 지오멤브레인과 직포와의 경계면 전단강도를 측정하여 비교 분석하였다. 경계면 전단강도는 대형직접전단 시험기를 이용하여 측정하였으며, 다양한 조건에 대해 거동 변화를 알아보기 위해 수침조건과 수직응력을 변화시켰다. 시험에 사용된 수직응력은 총 6단계로 저압(12, 24, 45kPa)과 고압(100, 500, 1,000kPa)으로 구분하여 적용하였다. 시험결과 수침에 의한 경계면 전단강도의 감소는 유의미한 수준으로 나타났으며, 수직응력의 영향은 불확실했다. 표면처리 여부에 따라 경계면 전단강도는 큰 차이를 보여주었는데 매끈한 지오멤브레인의 경계면 전단강도는 표면처리 지오멤브레인에 비해 절반까지 감소하는 것으로 나타났다.

Keywords

References

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