발파진동 실측 데이터를 활용한 지하구조물의 발파진동 영향 분석

초록

The effects of blasting vibration on underground structures were numerically analyzed using field-measured data. The research target facility is an open-pit limestone mine. The 3D numerical model for the analysis was constructed using the actual topography based on drone and LiDAR surveying data, and the blasting load which is the main input data in dynamic analysis was determined through back-analysis of the field-measured blasting vibration results. The analysis of the effects of blasting operations revealed that the stability of the underground structures was not significantly compromised when an appropriate maximum charge weight per delay was applied. Also, it was confirmed that the blasting load determined through back-analysis reproduced the blasting vibration regression equation derived from the field-measured data in a highly reasonable manner. Therefore, the back-analysis-based blasting load estimation technique can be effectively utilized as a method to determine input data for dynamic numerical analysis to evaluate blasting vibration impacts on underground structures. Consequently, the methodology proposed in this study is considered appropriate as an approach and analytical procedure for blasting vibration impact assessments.

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