한국지반공학회논문집 (Journal of the Korean Geotechnical Society)

  • 제29권2호
  • /
  • Pages.23-34
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  • 2013
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  • 1229-2427(pISSN)
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  • 2288-646X(eISSN)
한국지반공학회 (Korean Geotechnical Society)
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친환경 유기산 재료를 활용한 지반개량 메커니즘에 관한 연구

A Study on the Mechanism of Soil Improvement Using Environment-friendly Organic Acid Material

  • 이종휘 (현대중공업 중앙기술원 기반기술연구소 해양산업연구실) ;
  • 정재원 (한양대학교 건설환경공학과) ;
  • 한윤수 (현대중공업 중앙기술원 기반기술연구소 해양산업연구실) ;
  • 천병식 (한양대학교 건설환경공학과)
  • Lee, Jong-Hwi (Ocean Industry Research Dept. Advanced Technology Institute Hyundai Heavy Industry) ;
  • Jung, Jae-Won (Dept. of Civil and Environmental Engrg., Hanyang Univ.) ;
  • Han, Yun-Su (Ocean Industry Research Dept. Advanced Technology Institute Hyundai Heavy Industry) ;
  • Chun, Byung-Sik (Dept. of Civil and Environmental Engrg., Hanyang Univ.)
  • 투고 : 2012.06.12
  • 심사 : 2013.01.25
  • 발행 : 2013.02.28
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초록

식물의 추출물로 제조할 수 있는 유기산 재료는 포설 시 지중 속에서 미생물의 증식을 유도하며, 미생물에 의해 지반에서 압밀을 가속화시키고 빠르게 간극수압을 소산시킨다. 추가적으로 일부 미생물에 의해 탄산칼슘을 생성시켜 공극을 채워 강도를 증대시키거나 투수성을 감소시킬 수 있다. 따라서, 본 연구에서는 유기산 재료의 지반개량 메커니즘 규명을 위하여 화강풍화토, 라테라이트성 적토에 유기산 재료 혼합 전 후의 강도와 투수시험을 실시하였으며, SEM, XRD로부터 원인을 규명하였다. 유기산 재료 혼합 후 재령 96일에서 강도는 약 1.5~2.5배 증가하였으며, 투수계수는 72.9~93.1%의 감소율을 보였다. SEM으로부터 흙 입자의 구조가 변하거나 공극이 감소한 것을 관찰하여 강도증대, 투수감소의 원인을 규명할 수 있었으며, XRD로부터 탄산칼슘의 생성도 고결화의 주된 요인이라고 결론내릴 수 있었다. 이에 본 유기산 재료는 친환경적으로 지반을 개량할 수 있는 공법으로 활용될 수 있을 것으로 보인다.

An organic acid material, which can be manufactured by plants extraction, encourages microbe proliferation over time. Microbial activity, which is affected by organic acid, encourages accelerating consolidation with biochemical penetration; soil particles are compacted by microbes and pore water is dissipated quickly. Additionally, $CaCO_3$ for cementation was made by proliferating microbes. Accordingly, tests were conducted to investigate the unconfined compressive strength and permeability of soil samples aged with and without an organic acid. In the 96 days of aging, the strength was generally 1.5~2.5 times greater than those without an organic acid material and permeability was definitely decreased to 74.2~93.1%. SEM analysis showed the change of pore structure and the change of the total bacteria counts revealed the activity of microbes reflecting the engineering characteristics and this material would be an environment-friendly for soil improvement.

키워드

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