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A Study of MD Constitutive Model Calibration for Coarse-grained Soils

조립재료에 대한 MD 구성모델 캘리브레이션 연구

Changho Choi1*
,
Dong-Hoon Shin2
최 창호1*
,
신 동훈2
1Research Fellow, Dept. of Geotechnical Engineering, Korea Institute of Construction Technology
2Director, Infrastructure Research Center. K-water Institute
*교신저자. *Corresponding Author. 
30 March 2013. pp. 63-72
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Abstract

The structural stability of fill dam largely depends on the engineering behavior of rock materials used as main zone for dam construction and it is necessary to understand well the stress-strain characteristics of fill materials as well as shear strength property. In addition, the numerical analysis of fill dam requires a thorough study for calibrating material properties and parameters of a coarse-grained soil constitutive model. In this paper, large triaxial test results for Buhang-dam fill materials are analyzed and constitutive model parameters are calibrated based on the test results. It is shown that MD constitutive model is capable to predict the stress-strain behavior of dense and loose coarse-grained soils used for Buhang-dam construction based on the comparison study between the experimental test result and numerical simulation.

Keywords
Constitutive model
Parameter calibration
Triaxial test
Coarse-grained soil

필댐의 안정성은 댐 축조시 주재료로 활용되는 조립재료인 암석존(rock zone)의 공학적 거동에 의존하므로 조립재료인 rockfill 재료의 전단강도 뿐만 아니라 하중-변형 특성(stress-strain characteristics)을 보다 정확히 이해하여야 한다. 또한, 댐 제체의 거동을 예측하고 수치해석적으로 분석하기 위해서는 조립재료의 거동을 모사하기에 적합한 구성모델을 활용하기 위한 물성값 분석 및 모델 파라미터의 캘리브레이션 연구가 필요하다. 본 논문에서는 부항댐 제체 재료에 대한 대형삼축압축 실험결과를 분석하고 이를 기반으로 조립재료에 대한 구성모델 파라미터들을 분석하였다. 부항댐 제체 재료를 고밀도와 저밀도로 구분하여 시료를 제작하고 다양한 구속압으로 수행된 실험결과와 캘리브레이션 된 구성모델 시물레이션 결과를 상호 비교한 결과 MD 모델이 조립재료의 응력-변형률 거동을 효과적으로 모사할 수 있음을 파악하였다.

References
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1.Bardet, J-P. (1997), Experimental Soil Mechanics, Prentice Hall, Upper Saddle River, N.J.
2
2.Choi, C. (2013), “Parametric Study of MD Constitutive Model for Coarse-grained Soils”, Journal of the Korean Geosynthetics Society, Vol.12, No.1, in press (in Korean).
3
3.Kramer, S. L., Sivaneswaran, N., and Davis, R. O. (1990) “Analysis of membrane penetration in triaxial test”, Journal of Engineering Mechanics, ASCE, Vol.116, No.4, pp.773-789.
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Information
  • Publisher :Korean Geosythetics Society
  • Publisher(Ko) :한국지반신소재학회
  • Journal Title :Journal of the Korean Geosynthetics Society
  • Journal Title(Ko) :한국지반신소재학회 논문집
  • Volume : 12
  • No :1
  • Pages :63-72
  • Received Date : 2013-03-11
  • Revised Date : 2013-03-23
  • Accepted Date : 2013-03-25
  • DOI :https://doi.org/10.12814/jkgss.2013.12.1.063
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