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연약한 준설점토상 매립시 포설된 PET 매트와 지반거동에 관한 연구

A Study on Interaction Behaviors of Soil-PET Mat installed on Dredged Soils

  • Lee Man-Soo (Dept. of Civil Engrg., Hyundai Institute of Construction Technology, Hyundai Engrg. & Construction Company) ;
  • Jee Sung-Hyun (Dept. of Civil Engrg., Hyundai Institute of Construction Technology, Hyundai Engrg. & Construction Company) ;
  • Yang Tae-Seon (Dept. of Construction Information Engrg., Kimpo College)
  • 발행 : 2006.03.01

초록

토목섬유를 토목공학에 적용한 이후 토목섬유의 손상에 대하여 많은 관심이 되어왔다. 이 논문에서는 시험시공을 3지점에서 수행했는데 목적은 연약한 점토지반상에서 보강재의 거동을 조사하고 매립시 최적의 시공방법론을 찾기위한 것이다. 이 시험시공에 사용된 폴리에스테르매트(인장강도 15톤)의 봉합부분이 원호활동 사면파괴로 인하여 파괴되었는데 이는 급격한 성토로 인해 과잉간극수압이 발생하여 하중이 증가했기 때문이다. 매트의 인장 파열이 진행되는 지반 거동 중 성토고로 유발될 수 있는 간극수압보다 큰 간극수압이 측정되었는데, 특히 지표하 5m 깊이에서는 장기간에 걸쳐 간극수압이 증가하였다. 이러한 결과를 이용하여 성토고와 연약점토의 융기거동의 관계에 대하여 검토하였다.

Geosynthetic damage has attracted a major attention since the introduction of geotextiles for civil engineering applications. In this study 3 pilot trial embankments were carried out to investigate the behaviours of reinforced embankments over soft cohesive soils and to find the optimum methodology of embankments over soft soils. As the seamed part of polyester mat (PET, tensile strength 15 ton) used in the first full-scale field test was ruptured under progressing rotational slope failure because of unexpectedly rapid construction of embankments, the excessive pore water pressures were measured. On the soil behavior where tension explosion of mat was continued, pore pressure larger than the one caused by embankment height was measured. Especially, at the depth of 5.0 m under the ground pore pressure increased over long term. It was discussed with respect to the height of embankment and heaving behavior of soft soils.

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참고문헌

  1. Jewell, R. S. (1998), 'Soil Reinforcement with Geotextiles', CIRlA, London, pp.1-30
  2. Pinho-Lopes, M. and Recker, C., and Muller-Rochholz, J.(2002), 'Experimental Analysis of the Combined Effect of Installation Damage and Creep of Geosynthetics-New Results', Geosynthetics-7th ICG, Delmas, Vol.4, pp.1539-1544
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