PURPOSES : For the compaction control on the subgrade layer, dynamic cone penetration test (DCPT) is being applied to the Korea pavement subgrade construction guidelines. The existing equation in the Korean guidelines for estimating the resilient modulus, MR, from the DCPT test result penetration rate (PR), is a correlation developed from a small amount of data and does not consider the degree of compression. Therefore, this study attempts to propose an advanced MR-DCPT PR correlation through the correction of existing data and additional field tests.
METHODS : The in-situ DCPT tests were conducted according to the types of subgrade soils in the field. Thereafter, the existing guideline‘s data were collected and corrected with the degree of compaction, R.
RESULTS : In this study, the correlation coefficient is improved such that it is considerably higher than the existing equation using additional field data and converting the data used in the existing equation into data with over 95% degree of compaction.
CONCLUSIONS : Through verification, it was found that the relative errors of the proposed correlations in this study were reduced when compared with the existing equation.

ABSTRACT
1. 서론
2. DCPT 시험을 활용한 노상토 다짐관리
    2.1. 문헌분석 결과
    2.2. 국내 노상토 다짐관리 지침
    2.3. 동적 콘관입시험
    2.4. 도로포장 시공지침의 다짐도 검사
    2.5. 설계회복탄성계수 MR 산정
3. 현장 DCPT시험과 실내시험결과 분석 및 기존지침식 데이터 분석
    3.2. 현장 채취시료의 설계회복탄성계수 추정
    3.3. 기존 지침식 데이터 분석
4. 역학적 다짐관리를 위한 MR-PR 상관관계식개선
    4.1. 현장 데이터베이스 확장
    4.2. 다짐도를 고려한 기존 지침식 상관관계 분석
    4.3. 95% 신뢰구간의 개선된 상관관계식 제안
    4.4. 제안된 선형함수 개선식의 검증
5. 결론
REFERENCES

• 오병탁(수원대학교 건설환경공학과) | Oh Byung Tak
• 최준성(인덕대학교 토목환경공학과) | Choi Jun Seong
• 유광호(수원대학교 건설환경공학과) | You Kwang Ho 교신저자