한국지반공학회논문집 (Journal of the Korean Geotechnical Society)

  • 제21권8호
  • /
  • Pages.37-43
  • /
  • 2005
  • /
  • 1229-2427(pISSN)
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  • 2288-646X(eISSN)
한국지반공학회 (Korean Geotechnical Society)
권호 표지

일반화된 Hoek-Brown 모델의 정식화 및 Rounded Hoek-Brown 모델의 개발

Formulation of Generalized Hoek-Brown Model and Development of Rounded Hoek-Brown Model

  • 김범상 (포스코건설 토목환경사업본부 토목기술팀) ;
  • 권오순 (한국해양연구원 연안항만공학연구본부) ;
  • 장인성 (한국해양연구원 연안항만공학연구본부)
  • Kim Bum-Sang (Civil Engrg. Team, POSCO E&C) ;
  • Kwon O-Soon (Harborand Coostal Zone Development Research Div., KORDI) ;
  • Jang In-Sung (Harborand Coostal Zone Development Research Div., KORDI)
  • 발행 : 2005.10.01
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⟨ 이전 논문 다음 논문 ⟩

초록

암반의 거동을 예측하기 위해 1980년 발표된 Hoek-Brown 모델은 지속적인 개선과 더불어 수많은 문제들을 해결하기 위해 널리 사용되고 있다. 그러나 Hoek-Brown 모델의 유한요소법 등 수치해석에 대한 적용성에 관한 연구는 미미한 실정이다. 본 논문에서는 Hoek-Brown 모델을 일반적 소성론 절차에 따라 구성모델로 정식화하여 그 특징을 살펴보았고, 수치적 문제점을 유발하게 되는 항복면의 모서리부를 곡면으로 처리한 Rounded Hoek-Brown 모델을 제시하였다. 제안모델은 탄소성 구성모델로서의 요구조건들을 만족하며, 압축측에서 원래의 Hoek-Brown 모델과 동일한 항복면을 갖는다. 제안 모델을 일반적인 비선형 유한요소해석에 적용하기 위하여 제안 모델의 구성방정식을 수립하였다.

Hoek-Brown model, which was developed in order to predict the behavior of rock mass, has widely been utilized and revised by many researchers to solve various problems encountered in tunnelling and slope stability analysis. However, there is no schematic investigation on the application of the Hoek-Brown model to numerical analysis including finite element simulations. In this paper the Hoek-Brown model was formulated as a constitutive model according to the procedure of generalized plasticity theory, and a Rounded Hoek-Brown model, which could overcome the numerical difficulties by modifying the edge part of the yield surface as a curve shape, was newly proposed. The new model could satisfy the requirements as an elasto-plastic constitutive soil model and follow the yield surface of the original Hoek-Brown model in the compression mode. The constitutive equation for the proposed model herein was established and presented to be applicable to the generalized nonlinear finite element analysis.

키워드

참고문헌

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