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2019 Vol.29, Issue 1 Preview Page

Technical Note

Introduction of Barcelona Basic Model for Analysis of the Thermo- Elasto-Plastic Behavior of Unsaturated Soils

불포화토의 열･탄소성 거동 분석을 위한 Barcelona Basic Model 소개

Changsoo Lee1*
,
Seok Yoon1
,
Jaewon Lee1
,
Geon Young Kim1
이 창수1*
,
윤 석1
,
이 재원1
,
김 건영1
1Radioactive Waste Disposal Research Division, Korea Atomic Energy Research Institute
1한국원자력연구원 방사성폐기물처분연구부
* Corresponding Author
28 February 2019. pp. 38-51
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Abstract

Barcelona Basic Model (BBM) can describe not only swelling owing to decrease in effective stress, but also wetting-induced swelling due to decrease in suction. And the BBM can also consider increase in cohesion and apparent preconsolidation stress with suction, and decrease in the apparent preconsolidation stress with temperature. Therefore, the BBM is widely used all over the world to predict and to analyze coupled thermo-hydro-mechanical behavior of bentonite which is considered as buffer materials at the engineered barrier system in the high-level radioactive waste disposal system. However, the BBM is not well known in Korea, so this paper introduce the BBM to Korean rock engineers and geotechnical engineers. In this study, Modified Cam Clay (MCC) model is introduced before all, because the BBM was first developed as an extension of the MCC model to unsaturated soil conditions. Then, the thermo-elasto-plastic version of the BBM is described in detail.

Keywords
Barcelona Basic Model (BBM)
Thermo-elasto-plastic model
Unsaturated soils
Bentonite buffer materials
Coupled thermo-hydro-mechanical behavior

Barcelona Basic Model(BBM)은 응력의 변화에 따른 부피변화뿐만 아니라 흡입력의 변화에 따른 팽윤 거동을 설명할 수 있으며, 흡입력 변화에 따른 점착력과 선행압밀응력의 변화와 온도변화에 따른 선행압밀응력의 변화를 고려할 수 있다. 따라서, 고준위방사성폐기물 처분시스템에서 공학적방벽재로 고려되고 있는 벤토나이트 완충재의 열-수리-역학적 복합거동을 예측 및 분석하는 것에 많이 활용되고 있다. 그러나 우리나라의 암반 및 지반 공학자들에게 잘 알려져 있지 않기 때문에 BBM을 소개하고자 한다. BBM은 불포화 토질의 역학적 거동을 모사하기 위해 Modified Cam Clay(MCC) 모델을 확장하여 만들어 졌기 때문에 본 고에서는 먼저 MCC 모델을 간략하게 소개하고, 열-탄소성 모델인 BBM을 상세히 소개하였다.

키워드
Barcelona Basic Model(BBM)
열-탄소성 모델
불포화토
벤토나이트 완충재
THM 복합거동
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Information
  • Publisher :Korean Society for Rock Mechanics and Rock Engineering
  • Publisher(Ko) :한국암반공학회
  • Journal Title :Tunnel and Underground Space
  • Journal Title(Ko) :터널과 지하공간
  • Volume : 29
  • No :1
  • Pages :38-51
  • Received Date : 2019-02-18
  • Revised Date : 2019-02-25
  • Accepted Date : 2019-02-25
  • DOI :https://doi.org/10.7474/TUS.2019.29.1.038
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