한국지반신소재학회논문집 (Journal of the Korean Geosynthetics Society)

  • 제11권4호
  • /
  • Pages.55-62
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  • 2012
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  • 2508-2876(pISSN)
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  • 2287-9528(eISSN)
한국지반신소재학회 (Korean Geosynthetics Society)
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지반굴착에 소요되는 전기에너지와 표준관입시험 N값과의 상관관계 연구 II : 적용성 평가(현장시험시공)

A Study of Correlation between SPT N-value and Exerted Electrical Energy Required for Ground Drilling II : Application Study (Field Pilot Test)

  • Choi, Changho (Dept. of Geotechnical Engineering, Korea Institute of Construction Technology)
  • 투고 : 2012.12.04
  • 심사 : 2012.12.24
  • 발행 : 2012.12.30
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초록

본 적용성 평가 연구에서는 기초연구에서 제안된 지반굴착시 소요되는 전기에너지와 지반의 표준관입시험 N값에 대한 상관식의 타당성을 검증하기 위하여 전류값과 굴착깊이 계측을 위한 측정센서와 데이터 저장시스템을 개발하였으며, 현장시험시공을 수행하였다. 현장시험시공에서 계측된 전류값과 굴착속도는 상관식을 사용하여 표준관입시험 N값 추정에 이용되었으며, 추정한 표준관입시험 N값은 지반조사로부터 실측된 N값과 비교하였다. 현장시험시공 결과 지반굴착에 소요되는 전기에너지는 표준관입시험 N값을 추정하는 지표로 활용될 수 있으며, 말뚝기초의 선단위치를 결정하는 시공관리 자료로 활용될 수 있음을 확인하였다.

In this application study, field pilot tests were performed to evaluate the validity of a proposed formula between the exerted electrical energy and SPT N-value based on the result of the basic study. Measurement sensors and recording system were developed to obtain exerted motor current and drilling depth in a field. By using the correlation formula proposed in the basic study, the measured motor current and boring speed were applied to predict SPT N-value and the predicted N-values were compared to SPT N-value of site exploration. From the comparisons it is verified that the exerted electrical energy to bore ground might be used to predict SPT N-value and pile tip location.

키워드

참고문헌

  1. Architectural Institute of Korea (2004), Recommendations for Design of Building Foudnations-Japan Architecture, Originally published in Japan in 2001 by Architectural Institute of Japan, pp.389-391.
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  3. Cho, C. W. (2010), Piling Engineering Practice, Engineer Book, pp.46-60.
  4. Choi, C., Cho, J., Chung, H., Lee, Y. (2007a), "SPT N-value Estimation from Exerted Electrical Motor Energy for Preboring Pile Installation," Proceedings of 7th Japnanese-Korean-French Seminar on Geo-Environmental Engineering, Grenoble, France, pp.293-298.
  5. Choi, C. (2012), "A Study of Correlation between SPT N-value and Exerted Electrical Energy Required for Ground Drilling : Basic Study (Laboratory Soil Box Test)", Journal of Korean Geosynthetics Society, under review process.
  6. Geotechnical Engineering Research Group (2003), Plan, design, and construction of pile foundation in practice, Gunsul-JeongBo, pp.456-463.
  7. Korea Nation Housing Cooperation (2004), Solutions of Structural Problems for Engineers, pp.40-48. (in Korean)
  8. Korea Patent (2006), Apparatus for measuring excavation depth for ground excavation equipment, Patent No.556673.
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