Experimental Study for Consolidation by Electric Heating Systems

전기가열장치를 이용한 압밀촉진에 관한 실험적 연구

  • 박민철 (국립금오공과대학교 토목공학과) ;
  • 임은상 (수자원공사 기반시설연구소) ;
  • 이금성 ((주)건화 감리CM본부) ;
  • 한희수 (국립금오공과대학교 토목공학과)
  • Published : 2012.10.01

Abstract

This study deals with the conventional consolidation methods like preloading and vertical drains. For it, Two different mechanism, i.e., increasing of permeability and evaporating of pore water were studied. The marine clays excavated in Incheon were heated at low temperature($90^{\circ}C$) to increase the permeability. Also, Microwave oven and high-temperature electric heater were used for pore water evaporation. Several points raised from the experiments. To fix them, the electric heating system was revised to upgrade the field application and drain efficiency of pore water, and the marine clays were heated by revised electric heater at high temperature($250^{\circ}C$). From Experimental result showed that results, high-temperature heater induced the pore water evaporation and displayed the excellent consolidation behavior. In addition, the cone index of heated clays were increased about 19 times, which suggested that electric heating system could be applied for ensuring the trafficability of heavy equipments.

본 연구에서는 투수계수 증대 및 간극수 가열 증발에 의한 두 가지 방법으로 기존의 상재하중 및 연직배수에 의한 압밀공법의 성능을 개선하고자 하였다. 투수계수 증대 실험은 해성점토를 $90^{\circ}C$로 저온 가열하여 투수계수를 증대시켰으며, 간극수 가열증발 실험은 Microwave oven(전자레인지)과 고온 전기가열관($250^{\circ}C$)을 이용하여 간극수를 가열 증발하였다. 각 실험의 문제점을 파악한 후 현장적용성과 간극수 배출특성이 뛰어난 고온 전기가열관에 의한 지반가열장치를 고안한 후, 인천 송도지역 해성점토를 대상으로 고온 전기가열실험을 수행하였다. 실험결과, 고온 전기가열관을 이용한 간극수의 가열 증발효과로 인해 연약지반의 압밀효과가 탁월한 것으로 나타났으며, 또한 점토의 콘지수가 약 19배 정도 증가되어 추후 표층개량을 통한 시공장비의 주행성 확보에 도 활용될 것으로 판단된다.

Keywords

References

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