Strength and Effectiveness of Grouting of Sand Treated with Bacteria

Bacteria로 처리된 모래지반의 강도 및 주입효과

  • Received : 2013.01.29
  • Accepted : 2013.02.13
  • Published : 2013.02.28


The purpose of this study is to confirm strength and effectiveness of grouting of the sand treated with bacteria. In order to analyze the cementation of sand treated with bacteria, five types of specimens(Not treated, Cement 2% treatment, Cement 4% treatment, Cement 2% + $CaCO_3$ 2% treatment and $CaCO_3$ 4% treatment) were made. Unconfined compressive strength tests were done on $D\;5cm{\times}H\;10cm$ specimens and biogrouting tests were performed on $D\;6cm{\times}H\;12cm$ specimens to observe the effectiveness of grouting with bacteria. As a result, Cement 2% + $CaCO_3$ 2% treatment was found to be the most effective in terms of the unconfined compressive strength.

본 연구에서는 미생물 용액과 염화칼슘 수용액의 반응에 의해서 생성되는 탄산칼슘을 통해 연약지반(모래)의 고결화 및 주입 효과를 확인하고자 하였다. 미생물의 탄산칼슘 고결화 효과를 분석하기 위해 5가지 case(무처리, 시멘트 2%, 시멘트 4%, 시멘트 2% + 미생물 반응에 의한 탄산칼슘 2%, 미생물 반응에 의한 탄산칼슘 4%)를 실험하였다. $D\;5cm{\times}H\;10cm$ 공시체로 성형하여 일축압축강도를 측정하였으며, $D\;6cm{\times}H\;12cm$ 공시체에 연약지반을 형성하여 바이오그라우팅 주입 실험을 진행하였다. 그 결과, 시멘트 2% + 미생물 반응에 의한 탄산칼슘 2%에서 가장 높은 일축압축강도를 나타냈으며, 이는 무처리에 비해 약 1.5배 정도 강도가 증가하는 경향을 보였고, 주입실험의 경우 배수 조건의 장비주입(Air Compressor)을 통해 주입한 실험에서 효과가 뛰어났다.


Supported by : 한국연구재단


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