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

Korean Geo-Environmental Society (한국지반환경공학회)
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Dynamic Shear Behaviors on the Normally Consolidation Clay-Geosynthetic Interface

토목섬유-정규압밀점토의 접촉면 동적 전단거동 평가

  • Received : 2018.10.02
  • Accepted : 2018.11.23
  • Published : 2018.12.01
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Abstract

In this study, important characteristics were identified for the Geosynthetic-soil interface using overburden pressure and saltwater and fresh water to evaluate silt shear behavior of the Geosynthetic-soil interface. In addition, waste landfill can secure spaces for waste disposal in the sea and this spaces can be used for additional facilities which will be necessary in the future. Analysis of behavior characteristics on interface of Geosynthetic-soil shows that, if analyzed using standard consolidometers, the consolidation stress of fresh water increased significantly more than saltwater. When analyzed using cyclic shear apparatus, saltwater and freshwater in both conditions, the displacement value increases as the wire gauges become closer to the lower module, and the shear fracture tends to occur radically under saltwater conditions than fresh water. Therefore, seawater, fresh water that act on the interface of geosynthetic-soil, and installation of facility using geosynthetic should be considered as important parameters that are essential for the dynamic design factor of the water controlling facility.

본 연구에서는 토목섬유-점토의 접촉면 압밀 전단거동 평가를 위하여 상재하중 및 해수와 담수를 이용해 토목섬유-점토의 경계면에 대한 중요 특성인자를 규명하였다. 또한 폐기물 매립으로 바다에 매립공간을 확보하고 폐기물 처리 및 향후 토지이용 등 새롭게 필요 공간으로 변모가 가능하다. 토목섬유-점토의 접촉면에 거동특성을 분석한 결과 표준 압밀시험기를 이용하여 분석한 경우 해수보다 담수에서 압밀응력이 크게 증가하는 경향을 보였고, 동적 접촉면 전단 시험기를 이용하여 분석한 경우 해수와 담수 두 개의 조건에서 모두 동일하게 하부모듈에 가까운 와이어게이지일수록 변위값이 증가하고, 담수보다 해수의 조건에서 전단파괴가 급격히 일어나는 경향을 볼 수 있다. 따라서 토목섬유-점토의 접촉면에 작용하는 해수와 담수, 차수시설 설치여부(토목섬유)는 차수 시설 동적설계인자에 반드시 필요한 중요 변수로써 고려하여야 한다.

Keywords

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Fig. 1. Geocomposite (Kwak et al., 2013)

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Fig. 2. Graphical form of disturbance function (Park et al., 2000)

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Fig. 3. Test equipment

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Fig. 4. Order of experiment

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Fig. 5. Shear stress - shear strain (sea water samples)

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Fig. 6. Shear stress - shear strain (fresh water samples)

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Fig. 7. Disturbance function(D)/deviatoric plastic strain trajectory (𝜉D): sea water and fresh water with/without geosynthetic

Table 8. A, Z parameter analysis

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Fig. 8. A and Z parameters: sea water and fresh water with/without geosynthetic

Table 1. Physical test result

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Table 2. Geocomposite properties (Kwak et al., 2013)

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Table 3. Standard consolidation tester specification

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Table 4. Dynamic interface surface shear tester specification

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Table 5. Exam conditions

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Table 6. The maximum shear stress value with and without geo-synthetics (sea water samples)

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Table 7. The maximum shear stress value with and without geo-synthetics (fresh water samples)

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References

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  3. Kwak, C. W., Park, I. J. and Park, J. B. (2013), "Microscopic Observation on the Chemical and Cyclic-Degradation of Geosythethic-Soil Interface", In Press, Materials Research Innovations.
  4. Park, I. J., Yoo, J. H. and Kim, S. I. (2000), Disturbed state modeling for dynamic analysis of soil-structure interface, Jouranl of KGS, Vol. 16, No. 3, pp. 5-13.