A Study on Comparison and Application of Numerical Models to Experiments in Discontinuous Rock Mass

불연속성 암반에서의 수치모델 검토 및 시험과의 비교.적용에 대한 연구

  • 정교철 (안동대학교 지구환경과학과)
  • Published : 1997.08.01

Abstract

In general, there are various approaches available in literature to model discontinuous rock masses and engineers are often confused which one to use for designing structures in rock masses. Modelling rock masses can be classified mainly into two approaches. One is discrete modelling of intact rock and discontinuities and the other is the equivalent continuum modelling. In this study five models are selected ;(1) Crack tensor model, (2) Equivalent volume defect model, (3) Damage model, (4) Micro - structure model (Parallel model and Series model), and (5) Homogenization model. Most of these models are mainly concerned with how to define additional strain due to discontinuities over the representative elementary volume (REV) and how to relate the stress field of discontinuities to that acting on the REV. The characteristics of these models are clarified by comparing with results of some laboratory tests.

불연속성암반을 수치해석하는 방법으로 여러 가지 모델들이 제안되었다. 따라서 실제 구조물 설계에 적용함에 있어서 많은 혼란이 야기될 수도 있어 이들 모델들의 비교.검토에 대한 연구가 필요하게 되었다. 암반을 모델링하는 방법은 암석과 불연속면을 개별로 취급하는 방법과 의사연속체(疑似連續 )로 취급하는 등가연속체(等價連續 ) 모델링 등 크게 두가지로 구분할 수 있다. 본 연구에서는 후자의 등가연속체 모델 즉 (1) 크랙텐서모델, (2) 등가체적 결손 모델, (3) 손상모델, (4) 미소구조모델 (병렬모델 및 직렬모델), (5) 규질화모델 등을 서로 비교하였다. 이들 모델 대부분은 주로 대표요소용적상에서의 불연속면에 기인한 변형율 및 응력장을 다루고 있었다. 마지막으로 크랙을 포함하는 세벤트몰타르 공시체를 사용한 실내시험 결과와 비교하므로서 이들 모델의 특성을 명확히 하였다.의 특성을 명확히 하였다.

Keywords

References

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