Tunnel and Underground Space (터널과지하공간)

Korean Society for Rock Mechanics and Rock Engineering (한국암반공학회)
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Analysis of In-situ Rock Conditions for Fragmentation Prediction in Bench Blasting

벤치발파에서 파쇄도 예측을 위한 암반조건 분석

  • Published : 2004.10.01
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Abstract

Prediction of fragmentation in bench blasting is one of the most important factors to establish the production plan. It is widely accepted that fragmentation could be accurately predicted using the Kuz-Ram model in bench blasting. Nevertheless, the model has an ambiguous or subjective aspect in evaluating the model parameters such as joint condition, rock strength, density, burden, explosive strength and spacing. This study proposes a new method to evaluate the parameters of Kuz-Ram model, and the predicted mean fragment sizes using the proposed method are examined by comparing the measured sizes in the field. The results show that the predictions using Kuz-Ram model with the proposed method coincide with field measurements, but Kuz-Ram model does not reflect the in-situ rock condition and hence needs to be improved.

벤치발파에서 암석 파쇄도 예측은 생산계획을 수립하는 데 있어서 가장 중요한 요소 중의 하나이다. Kua-Ram 모델은 지금까지 제안된 암석 파쇄도 예측 모델 중 가장 우수한 것으로 평가받고 있으나, 이 모델의 평가항목을 구성하고 있는 절리조건, 암석강도, 밀도, 사용폭약의 성능과 저항선, 공간격 등의 요소들은 그 값을 선정하는 과정에서 주관적인 요소가 개입되거나 정의가 모호한 요소를 포함하고 있다. 이 연구에서는 Kuz-Ram 모델을 구성하는 여러 평가항목의 값을 선정하는 과정에서 주관적이거나 모호한 요소를 제거하는 방법에 대해 검토하였으며, 예측값을 현장조사 결과와 비교하여 적용성을 검토하였다. Kuz-Ram 모델은 비교적 정확한 예측결과를 보였으나, 현지암반 조건을 충분히 반영하지 못하여 개선이 필요한 것으로 판단되었다.

Keywords

References

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