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논문 상세정보

압밀, 토모그래피, 액상화시험에서 벤더엘리먼트의 적용

Application of Bender Elements in Consolidation, Tomography, and Liquefaction Tests

초록

본 논문은 벤더 엘리먼트를 압밀, 토모그래피, 그리고 액상화에 적용하는 방법을 다루었다. 모래와 점토를 이용하여 압밀 시험을 수행하면서 전단파 속도를 측정하여 하중 재하 및 제하 시기를 평가하였다. 전단파 속도는 유효응력의 함수이므로 전단파 속도를 이용하여 하중 재하시기를 결정할 수 있으나, 침하량 기준과 전단파 속도(유효응력) 메카니즘이 다를 수 있으므로 주의해야 한다. 또한 전단파 속도는 고결화 제어 구간(cemented controlled regime)과 응력 제어 구간(stress controlled regime)으로 구별할 수 있어 응력이력현상을 확인할 수 있다. 벤더 엘리먼트가 설치된 고정된 프레임에서 전단파 토모그래피가 가능하다. 낮은 구속응력상태와 진 삼축 장비 내에서 토모그래피 실험을 수행한 결과 전단파 토모그래피는 평균유효응력과 관련된 전단파 속도 변화의 관측에 사용될 수 있음을 보여 주였다. 한편 액상화와 같은 어떤 현상을 관측하기 위하여 반복 주기가 높은 방식의 전단파 트랜스-일루미네이션(trans-illumination)이 적용되었다. 전단파 속도와 크기의 전개는 액상화 동안 과잉간극수압의 경향과 평행함을 알 수 있었다. 본 논문에서 소개한 적용들은 벤더 엘리먼트가 실내 시험에서 전단파 검측에 상당히 효과적인 방법이 될 수 있음을 보여준다.

Abstract

The scope of this paper covers the applications of bender element tests in consolidation, tomography, and liquefaction. Loading and unloading time during consolidation are evaluated based on shear wave velocity. As S-wave velocity is dependent on effective stress, the loading step may be determined. However, cautions are required due to the different mechanism between the settlement and effective stress criteria. The stress history may be evaluated because the S-wave shows the cement controlled regime and stress controlled regimes. A fixed frame complemented with bender elements permits S-wave tomography The tomography system is tested at low confinement within a true triaxial cell. Results show that shear wave velocity tomography permits monitoring changes in the velocity field which is related to the average effective stress. To monitor the liquefaction phenomenon, S-wave trans-illumination is implemented with a high repetition rate to provide detailed information on the evolution of shear stiffness during liquefaction. The evolution of shear wave propagation velocity and attenuation parallel the time-history of excess pore pressure during liquefaction. Applications discussed in this paper show that bender elements can be a very effective tool for the detection of shear waves in the laboratory.

저자의 다른 논문

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이 논문을 인용한 문헌 (3)

  1. Lee, Chang-Ho ; Yoon, Hyung-Koo ; Kim, Joon-Han ; Lee, Jong-Sub 2008. "Evaluation of Consolidation Properties in Soft Soils Using Elastic and Electromagnetic Waves" 韓國地盤工學會論文集 = Journal of the Korean geotechnical society, 24(8): 25~34 
  2. Jang, In-Sung ; Kwon, O-Soon ; Kim, Byoung-Il ; Lee, Seung-Hyun 2008. "Parametric Studies for Measurements of Dynamic Properties of Soils Using Inhole type CPTu" 한국해안·해양공학회논문집 = Journal of Korean Society of Coastal and Ocean Engineers, 20(6): 523~531 
  3. Byun, Yong-Hoon ; Cho, Se-Hyun ; Yoon, Hyung-Koo ; Choo, Yun-Wook ; Kim, Dong-Su ; Lee, Jong-Sub 2012. "Void Ratio Evaluation of Unsaturated Soils by Compressional and Shear Waves" 韓國地盤工學會論文集 = Journal of the Korean geotechnical society, 28(12): 41~51 

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