SASW 시험을 활용한 지반 현장 다짐도 평가
Evaluation of Ground Compaction Using SASW Testing
0
조회
0
다운로드
2
인용
0
참고문헌
키워드
초록
다짐은 토목현장에서 지반의 안정성을 확보하고 침하 방지를 위해 수행된다. 다짐을 수행하는 작업도 중요하지만, 다짐을완료한 후 지반의 다짐도를 평가하는 것도 매우 중요하다. 국내 현장에서는 주로 평판 재하시험이나 들밀도 시험 등의 포인트방식의 시험을 통해 다짐 지역의 일부만을 평가한다. 기존에 제시된 방법들은 표면 다짐에 대한 평가가 가능하지만, 좀 더깊은 지반의 다짐까지 평가하기에는 어려움이 따른다. 또한, 포인트 시험 방식을 통해 평가를 수행하는 면적이 크지 않기때문에, 전체적인 다짐도의 평가가 어렵다. 이에 대한 해결책으로 표면파를 활용한 SASW 시험을 통해 다짐을 평가하였다. SASW 시험은 포인트 방식의 시험보다 측정하는 범위가 넓고, 시험 세팅에 따라 깊은 심도의 지반에 대한 강성 또한 파악할수 있다. 다짐 평가를 위해 본 연구에서는 다른 조건으로 다져진 성토 현장에서 SASW 시험을 수행하였다. 또한, Nuclear density gauge 시험을 동반하여 SASW의 다짐 분석 결과와 비교 및 검증을 수행하였다. 이 연구 결과를 통해 SASW를 활용한지반 현장의 다짐도 평가가 가능함을 확인할 수 있었다.
Abstract
Compaction is performed in civil engineering sites to secure the stability of the ground and prevent settlement. While the process of compaction is crucial, it is also essential to evaluate the degree of compaction after the completion of the process. In domestic sites, the evaluation of compaction is mainly conducted on a small number of spot using point-based tests such as plate load tests and sand cone tests. The methods presented so far allow assessment of surface compaction, but evaluating compaction in deeper layers poses challenges. Moreover, due to the limited coverage of point-based testing, it is difficult to achieve an overall assessment of compaction. As a solution to these issues, the Spectral-Analysis-of-Surface-Waves (SASW) tests were utilized to evaluate compaction. SASW tests offer a broader measurement range compared to point-based tests, and depending on the test setup, this method can provide the stiffness of the ground at greater depths. In this study, SASW tests were conducted in a compacted soil site under different conditions to assess compaction. Additionally, Nuclear Density Gauge tests were conducted concurrently to compare and verify the results of SASW. The research results confirmed the feasibility of evaluating compaction using SASW at the geotechnical site.
참고문헌 (11)
- Ali, A. M., "Applications of ground penetrating radar for the assessment of newly paved roads", Master, pp.2022
- Joh, S. H., "Advances in the data interpretation technique for Spectral-Analysis-of-Surface-Waves (SASW) measurements", Ph.D., pp.1996
- Kausel, E., "Stiffness matrices for layered soils", Bulletin of the Seismological Society of America, 71, pp.1743~1761 (1981)
- Kim, D. S., "Evaluation of density in layer compaction using SASW method", Soil Dynamics and Earthquake Engineering, 2, pp.39~46 (2001)
- Kim, G., "Evaluation of the Lateral Variability in the Vs Profiles at Geotechnical Sites using the Spectral-Analysis-of-Surface-Waves(SASW)Method", 12th National Conference on Earthquake Engineering, (10181) (2022)
- Nazarian, S., "In situ shear wave velocities from spectral analysis of surface waves", 8th World Conference on Earthquake Engineering, 3, pp.31~38 (1984), Prentice-Hall
- Shear Wave Velocity Profiling Using the SASW Method at Four Nuclear Power Plant Sites(NPP1, NPP2, NPP3, and NPP4)in Taiwan, "Stokoe, II K. H.", University of Texas at Austin, ~, pp.Geotechnical Engineering Report GR21-13 (2021)
- Stokoe, K. H., "Use of Rayleigh waves in liquefaction Studies" (1985), ASCE
- Stokoe, K. H., "Spectral-Analysis-of-Surface-Waves(SASW)testing to evaluate Vs profiles at geotechnical and geological sites", 16th World Conference on Earthquake Engineering, (4948) (2017)
- Stokoe, K. H., "Characterization of Geotechnical Sites by the SASW Method", Presented at the 13th International Conference on Soil Mechanics and Foundation Engineering (1994)
- Yokohama, S., "Change in the hydromechanical characteristics of embankment material due to compaction state conditions", Soils and Foundations, 54(4), pp.731~747 (2014)