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2022 Vol.38, Issue 11 Preview Page
Use of Dynamic Cone Penetrometer and Light-Weight Deflectometer for Quality Control on Subgrade Base

토공사 다짐품질 관리를 위한 동적콘관입시험 및 소형충격재하시험의 활용에 관한 연구

Sung-Ha Baek1
,
Jin-Woo Cho2
,
Namgyu Kim3
,
Jin-Young Kim4*
백 성하1
,
조 진우2
,
김 남규3
,
김 진영4*
1Member, Assistant Prof., School of Civil and Environmental Engineering & Construction Engineering Research Institute, Hankyong National Univ.
2Member, Senior Researcher, Korea Institute of Civil Engr. and Building Tech.
3Senior Researcher, Korea Institute of Civil Engr. and Building Tech.
4Member, Senior Researcher, Korea Institute of Civil Engr. and Building Tech.
1정회원, 한경대학교 건설환경공학부 조교수
2정회원, 한국건설기술연구원 지반연구본부 수석연구원
3비회원, 한국건설기술연구원 연구전략기획본부 수석연구원
4정회원, 한국건설기술연구원 지반연구본부 수석연구원
*Corresponding Author
30 November 2022. pp. 55-67
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Abstract

This study applied the dynamic cone penetrometer test (DCPT) and light-weight deflectometer test (LWDT) to the quality control of subgrade base by performing DCPT, LWDT, and plate load test (PLT) at two earthwork sites. Although DCPT and LWDT were performed under the same conditions, the results showed significant variation with the test location. Because the measured value at the time of the initial blow, which varies depending on the test location, significantly influenced the test result. Thus, it was appropriate to ignore the first two blows as preliminary blows and use subsequent measurements as quality control indicators. In addition, DCPT, LWDT, and PLT results showed a high correlation under the same conditions. Especially regression analyses using averaged data for each experiment condition tended to yield significantly improved R2 values over individual point data sets. This indicates that average DCPT and LWDT values at various adjacent locations are better quality control indicators for subgrade bases than individual point values.

Keywords
Dynamic cone penetrometer
Earthwork
Light-weight deflectometer
Quality control

본 연구에서는 동적콘관입시험(dynamic cone penetrometer test, DCPT)과 소형충격재하시험(light weight deflectometer test, LWDT)을 다짐품질 관리에 적용하기 위해서, 서로 다른 성토재료를 사용하는 국내의 두 토공사 현장을 대상으로 DCPT, LWDT, 평판재하시험(plate load test, PLT)을 수행했다. 동일한 조건에서 수행되었음에도 DCPT와 LWDT 결과는 위치에 따라 변동성이 매우 컸다. 이는 위치에 따라 변동성이 큰 초기 타격 시의 측정값이 시험 결과에 큰 영향을 주었기 때문으로, 두 번째 타격까지를 예비타격으로 간주하고 이후 측정값을 바탕으로 도출된 결과를 다짐품질 지표로 활용하는 것이 적절한 것으로 나타났다. 또한 동일한 시험 조건에서 수행된 DCPT, LWDT, PLT 결과는 서로 높은 상관성을 보였다. 특히, 일점 분석(individual point analysis)보다, 평균값 분석(average point analysis) 시 상관성이 향상되는 것으로 나타나, 인접한 여러 위치에서 수행된 DCPT 및 LWDT 결과의 평균값을 다짐품질 지표로 활용하는 것이 적절할 것으로 판단된다.

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Information
  • Publisher :The Korean Geotechnical Society
  • Publisher(Ko) :한국지반공학회
  • Journal Title :Journal of the Korean Geotechnical Society
  • Journal Title(Ko) :한국지반공학회 논문집
  • Volume : 38
  • No :11
  • Pages :55-67
  • Received Date : 2022-10-13
  • Revised Date : 2022-10-20
  • Accepted Date : 2022-10-22
  • DOI :https://doi.org/10.7843/kgs.2022.38.11.55
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