Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Estimation of Dynamic Material Properties for Fill Dam : II. Nonlinear Deformation Characteristics

필댐 제체 재료의 동적 물성치 평가 : II. 비선형 동적 변형특성

  • Lee, Sei-Hyun (Dept. of Civil and Environmental Engrg., KAIST) ;
  • Kim, Dong-Soo (Dept. of Civil and Environmental Engrg., KAIST) ;
  • Choo, Yun-Wook (Dept. of Civil and Environmental Engineering, KAIST) ;
  • Choo, Hyek-Kee (Korea Infrastructure Safety and Technology Corporation, Dept. of Civil and Environmental Engrg., Univ. of Incheon)
  • 이세현 (한국과학기술원 건설 및 환경공학과) ;
  • 김동수 (한국과학기술원 건설 및 환경공학과) ;
  • 추연욱 (한국과학기술원 건설 및 환경공학과) ;
  • 권혁기 (한국시설안전공단, 인천대학교 토목환경공학과)
  • Received : 2009.09.28
  • Accepted : 2009.12.11
  • Published : 2009.12.31
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Abstract

Nonlinear dynamic deformation characteristics, expressed in terms of normalized shear modulus reduction curve (G/$G_{max}-\log\gamma$, G/$G_{max}$ curve) and damping curve (D-$\log\gamma$), are important input parameters with shear wave velocity profile ($V_s$-profile) in the seismic analysis of (new or existing) fill dam. In this paper, the reasonable and economical methods to evaluate the nonlinear dynamic deformation characteristics for core zone and rockfill zone respectively are presented. For the core zone, 111 G/$G_{max}$ curves and 98 damping curves which meet the requirements of core material were compiled and representative curves and ranges were proposed for the three ranges of confining pressure (0~100 kPa, 100 kPa~200 kPa, more than 200 kPa). The reliability of the proposed curves for the core zone were verified by comparing with the resonant column test results of two kinds of core materials. For the rockfill zone, 135 G/$G_{max}$ curves and 65 damping curves were compiled from the test results of gravelly materials using large scale testing equipments. The representative curves and ranges for G/$G_{max}$ were proposed for the three ranges of confining pressure (0~50 kPa, 50 kPa~100 kPa, more than 100 kPa) and those for damping were proposed independently of confining pressure. The reliability of the proposed curves for the rockfill zone were verified by comparing with the large scale triaxial test results of rockfill materials in the B-dam which is being constructed.

정규화 전단탄성계수 감소곡선(G/$G_{max}-\log\gamma$)과 감쇠비 곡선(D-$\log\gamma$)으로 표현되는 비선형 동적 변형특성은 현장 전단파속도 주상도와 함께 필댐의 동적 내진해석시 중요한 입력 물성치로 사용된다. 본 논문에서는 필댐 심벽부와 사력부 각각에 대하여 합리적이고 경제적인 비선형 동적 변형특성 산정 방법을 제시하였다. 심벽부의 경우, 기존 여러 연구 결과로부터 심벽부 구성 재료의 조건을 만족하는 정규화 전단탄성계수 감소곡선 111개, 감쇠비 곡선 98개를 확보하여 3개의 구속응력 영역(0~100kPa, 100kPa~200kPa, 200kPa 초과)에 대한 대표 곡선 및 범위를 제안하였고, 2종의 기존 댐 심벽부 시료에 대한 공진주 시험 결과와 비교하여 신뢰성을 확인하였다. 사력부의 경우, 자갈 등 입자가 큰 사석 재료에 대해 대형 시험장비를 이용하여 시험을 수행한 국외 연구 결과로 부터 정규화 전단탄성계수 감소곡선 135개, 감쇠비 곡선 65개를 획득하였다. 정규화 전단탄성계수 감소곡선은 3개의 구속응력 영역(50kPa 이하, 50kPa~100kPa, 100kPa 초과)에 대해 대표 곡선을 제안하였고, 감쇠비 곡선은 구속응력에 관계없이 하나의 대표 곡선으로 제안하였다. 또한 현재 시공중인 B댐의 사석 재료에 대한 결과와 비교하여 대표 곡선 및 범위에 대한 신뢰성을 검증하였다.

Keywords

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