Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Evaluation of Injection Degree of Biopolymer Grouting Using Electrical Resistivity

전기비저항을 이용한 바이오폴리머 그라우팅 주입도 평가

  • Jun, Minu (Dept. of Civil & Environmental Engineering, Gachon Univ.) ;
  • Cho, Hyunmuk (Dept. of Civil & Environmental Engineering, Gachon Univ.) ;
  • Ryou, Jae-Eun (Dept. of Civil Engineering, Chungbuk National Univ.) ;
  • Hong, Won-Taek (Dept. Civil & Environmental Engineering, Gachon Univ.)
  • 전민우 (가천대학교 토목환경공학과) ;
  • 조현묵 (가천대학교 토목환경공학과) ;
  • 유재은 (충북대학교 토목공학부 ) ;
  • 홍원택 (가천대학교 토목환경공학과)
  • Received : 2024.06.11
  • Accepted : 2024.07.08
  • Published : 2024.08.31
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Abstract

Monitoring the injection degree of biopolymers in soils is required in estimating the performance of biopolymer-treated grounds. In this study, the degree of saturation and injection process of biopolymer solutions in sandy soils were evaluated using electrical resistivity. To assess the changes in electrical resistivity according to the contents of the biopolymer solutions, electrical resistivities were measured for Jumunjin sand-xanthan gum biopolymer solution (weight concentration of 0.5%) mixtures with different degrees of saturation of 20%, 40%, 60%, 80%, and 100%. In addition, electrical resistivities were measured at eight layers in oven-dried Jumunjin sand during the upward injection of the xanthan gum biopolymer solution to monitor the injection process. Experimental results showed that the electrical resistivity decreased as the degree of saturation of the mixture increased, and their relationship was constructed. During the injection of the xanthan gum biopolymer solution into the sandy soils, the electrical resistivity decreased and converged and the degree of saturation at each layer could be estimated on the basis of the above-constructed relationship. This study demonstrated that electrical resistivity may be an effective physical property for monitoring the injection degree of biopolymer solutions in the ground.

바이오폴리머 주입에 의한 보강효과 예측을 위하여 대상지반 내 바이오폴리머의 주입도 모니터링이 요구된다. 본 연구에서는 전기비저항을 이용하여 사질토 내 바이오폴리머 수용액의 포화도 및 주입경과를 평가하였다. 사질토 내 바이오폴리머 수용액 포화도에 따른 전기비저항의 변화를 평가하고자 중량농도 0.5%의 잔탄검 바이오폴리머 수용액과 주문진 표준사를 이용하여 조성된 포화도 20%, 40%, 60%, 80%, 100% 시료의 전기비저항을 측정하였다. 또한, 주입경과 평가를 위하여 노건조 주문진 표준사 시료에 대한 바이오폴리머 수용액 상방향 주입 중 8개 층에서 전기비저항을 측정하였다. 포화도에 따른 전기비저항 측정 결과, 시료의 포화도가 증가함에 따라 전기비저항은 감소하였으며, 해당 결과를 바탕으로 포화도와 전기비저항 사이의 상관관계가 수립되었다. 주입경과에 따른 전기비저항 측정 결과, 바이오 폴리머 수용액이 시료에 침투함에 따라 전기비저항은 감소 및 수렴하였으며, 앞서 수립된 포화도-전기비저항 상관관계를 바탕으로 주입과정 중 바이오폴리머 수용액 주입도 평가가 가능하였다. 본 연구는 바이오폴리머 처리 구간에 대한 전기비저항 평가가 바이오폴리머의 주입 양상 모니터링에 활용될 수 있음을 보여준다.

Keywords

Acknowledgement

이 성과는 정부(과학기술정보통신부)의 재원으로 한국연구재단의 지원을 받아 수행된 연구임(No. 2022R1A4A3029737).

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