[논문]피압 작용에 따른 DCM 개량체의 지반공학적 특성

윤대호; 김윤태

doi:10.12652/ksce.2022.42.2.0187

[국내논문] 피압 작용에 따른 DCM 개량체의 지반공학적 특성
Geotechnical Characteristics of DCM-Improved Specimen Under Artesian Pressure 원문보기

KSCE Journal of Civil and Environmental Engineering Research = 대한토목학회논문집, v.42 no.2, 2022년, pp.187 - 195

윤대호 (부경대학교 스마트인프라기술연구소) , 김윤태 (부경대학교 해양공학과)

초록
AI-Helper

본 연구에서는 피압이 DCM 개량체의 역학적 특성에 미치는 영향을 알아보기 위해 피압의 크기를 조절할 수 있는 공시체용 수조를 제작하여 실내실험을 수행하였다. 피압의 크기는 실험실 규모 및 동수경사를 고려하여 결정하였다. 실험 결과, 피압의 크기가 증가함에 따라 일축압축강도, 할선탄성계수, 단위중량은 선형적으로 감소하고, 함수비는 증가하였다. 또한, 개량체의 응력-변형 거동은 피압이 증가함에 따라 취성에서 연성 형태의 거동을 보었다. 피압 작용으로 발생한 유출수는 개량체의 용탈현상으로 인해 페놀프탈레인 용액에 반응하는 결과를 보였다. 또한, SEM 촬영 결과 입자 사이에 작은 양의 에트린자이트가 형성되어 있는 것을 확인하였다.

Abstract ▼ AI-Helper

This study investigated the effect of artesian pressure on mechanical properties of deep cement mixing (DCM)-improved specimens. Various laboratory tests such as unconfined compression test and scanning electron microscope (SEM) were conducted on DCM specimens which curied in a water tank with different artesian pressures. The artesian pressure was determined in consideration of the laboratory scale and the hydraulic gradient in field conditions. Results of experimental tests indicated that unconfined compressive strength, secant modulus, and unit weight of specimen decreased and water content tended to increase as an artesian pressure increased. The stress-strain behavior changed brittle to ductile behaviors as an artesian pressure increased. The outflow water from the water tank reacted with the phenolphthalein solution due to the leaching phenomenon of the improved specimen. SEM analysis also confirmed that a small amount of ettringite was formed between soil particles in the specimens with artesian pressure.

주제어

표/그림 (13)

그림 Fig. 1. Soil Profile at Nakdong River Estuary
그림 Fig. 2. DCM Specimen Under Various Artesian Pressures
표 Table 1. Geotechnical Properties of Soils
표 Table 2. Experiment Conditions of Soil Mixtures
그림 Fig. 3. Failure Behavior of Specimens
그림 Fig. 4. Unconfined Compressive Test Results of Sand Mixture
그림 Fig. 5. Unconfined Compressive Test Results of Clay Mixtures
그림 Fig. 6. Stress-Strain Behavior Under Different Hydraulic Gradients
그림 Fig. 7. The Relationship Between Secant Modulus and Unconfined Compressive Strength
그림 Fig. 8. Geotechnical Characteristics according to Artesian Pressure
그림 Fig. 9. Phenolphtalein Reaction Result
그림 Fig. 10. SEM Result
그림 Fig. 11. Boiling Effect Under a High Hydraulic Gradient

참고문헌 (20)

Baek, S. H. (2002). Characterisation and geotechnical properties of Pusan clays by insitu tests, Doctor's Thesis, Dong-a University, pp. 1-249 (In Korean).
Chun, B. S., Kong, J. Y., Jung, H. S. and Lee, S. I. (2008). "A study on confirmation test for soft ground improvement effect of chemical grouting." Korean Geo-Environmental Conference 2008, pp. 55-66 (In Korean).
Chung, S. G., Lee, N. K., Lee, J. M., Min, S. C. and Hong, Y. P. (2010). "Hydraulic characteristics of Busan clay in the floodplain of the Nakdong river delta." Journal of Korean Geotechnical Society, Vol. 26, No. 11, pp. 47-61 (In Korean).
Ham, Y. S. (2019). A study on the causes and prevention of collapse through case analysis of retaining accident, Master's Thesis, Yonsei University, pp. 1-56 (In Korean).
Han, Y. C. and Yu, G. Y. (1999). "A study of artesian characteristics in Yangsan/Mulgeum site." KGS Fall '99 National Conference, pp. 123-130 (In Korean).
Heo, D. Y. (2003). A study on the depositional environment and geotechnical properties of clay deposited at the Busan new port site, PhD's Thesis, Dong-A University, pp. 8-198 (In Korean).
Kim, D. M., Kim, W. S. and Baek, Y. (2017). "Extracting the risk factor of ground excavation construction and confidence analysis using statistical test procedure." Journal of Korean Society of Disaster & Security, Vol. 10, No. 1, pp. 11-17 (In Korean).
Kim, G. B., Choi, D. H. and Shin, S. H. (2011). "Characteristics of groundwater levels fluctuation and quality in Ddan-sum area." Journal of the Korean Geo-Environmental Society, Vol. 12, No. 2, pp. 35-43 (In Korean).
Kim, H. T., Cho, J. H., Yoo, J. Y., Ro, J. K. and Kim, S. W. (2002). "Self-weight consolidation settlement of soft-grounds on the artesian pressure after the penetration of vertical drain." KGS Fall '02 National Conference, pp. 597-604 (in Korean).
Kim, T. Y., Kang, D. H., Kim, S. S., Kim, B. W. and Kwon, B. H. (2008a). "The scale-dependent of hydraulic conductivity in leaky confined aquifer with high permeability at the ttaan isle, Gimhae city." Journal of Engineering Geology, Vol. 18, No. 4, pp. 415-422 (In Korean).
Kim, K. K., Moon, H. J., Kim, J. J., Park, S. S. and Jung, S. J. (2008b), "A study on change color and alkali density of concrete using phenolphthalein method." 2008 Conference of Architectural Institute of Korea, Vol. 28, No. 1, pp. 339-342 (In Korean).
Kim, S. J. (2010). "A development of 3-D numeric model for the confined flow and discharge under sea ground." Journal of Korean Society of Coastal and Ocean Engineers, Vol. 22, No. 6, pp. 387-396 (In Korean).
Kim, T. H., Yu, J. M., Lee, M. J., Bae, K. H. and Jung, D. S. (2006). "A design case study considering the artesian pressure in Hwa Jeon site of Nakdong delta area." Korean Association of Professional Engineers Soil Mechanics & Foundation Engineering, pp. 311-319 (in Korean).
Kim, Y. T. and Do T. H. (2010). "Effect of leaching on the compressibility of Busan clay." KSCE Journal of Civil Engineering, KSCE, Vol. 14, No. 3, pp. 291-297.

상세보기
Kim, Y. T., Nguyen, B. P. and Yun, D. H. (2018). "Effect of artesian pressure on consolidation behavior of drainage-installed marine clay deposit." Journal of Materials in Civil Engineering, Vol. 30, No. 8, pp. 1-13.
Lee, S. H., Park, D. H., Lee, Y. D., Won, K. S. and Kihm, J. H. (2016). "Heterogeneity characterization in a coastal confined aquifer of the Nakdong river delta area using geological and groundwater modeling." Journal of the Geological Society of Korea, Vol. 52, No. 4, pp. 511-523 (In Korean).

상세보기
Seong, J. H., Jung, S. H. and Shin, J. Y. (2011). "A study for safety management on ground excavation by analysis of accident events." Journal of the Korea Institute for Structural Maintenance and Inspection, Vol. 15, No. 6, pp. 175-183 (In Korean).
Song, C. Y., Nam, S. S. and Chun, B. S. (1991). "Cut-off effect and durability in aquifer by chemical grouting." Journal of Korean Society of Civil Engineers, Vol. 11, No. 4, pp. 189-200 (In Korean).
Yun, D. H. and Kim, Y. T. (2016). "Leaching characteristics on clay ground induced by artesian pressure." Journal of Korean Geosynthetics Society, Vol. 15, No. 4, pp. 97-104 (In Korean).
Yun, D. H., Kim, J. H. and Kim, Y. T. (2016). "Consolidation characteristics of soft ground with artesian pressure." Journal of the Korean Geo-Environmental Society, Vol. 17, No. 2, pp. 31-39 (In Korean).

내보내기 구분	파일저장 인쇄 메일전송
구성항목	기본정보 상세정보 관리번호, 논문명, 저널/프로시딩명, 저자 , 발행년, 권, 호, 시작페이지, 끝페이지, 발행기관 관리번호, 논문명, 대등논문명, 저자 , 저널/프로시딩명, 발행기관, 발행년, 발행언어, 권, 호, 시작페이지, 끝페이지, ISBN, ISSN, 주제분야, 키워드, 초록(한글), 초록(영문), 저자(소속기관)
저장형식	Text(ASCII format) Excel format RefWorks Direct Export RIS format (for Reference Manager, ProCite, EndNote), Scholar's Aids, Mendeley
메일정보	받는사람 (필수) @ 보내는사람 (선택) @ 제목 내용 KISTI 검색결과 이메일 서비스
안내	총 건의 자료가 검색되었습니다. 다운받으실 자료의 인덱스를 입력하세요. (1-10,000) 검색결과의 순서대로 최대 10,000건 까지 다운로드가 가능합니다. 데이타가 많을 경우 속도가 느려질 수 있습니다.(최대 2~3분 소요) 다운로드 파일은 UTF-8 형태로 저장됩니다. 파일의 내용이 제대로 보이지 않을실 때는 웹브라우저 상단의 보기 -> 인코딩 -> 자동선택 여부를 확인하십시오. ~ Text(ASCII format) Excel format

연합인증