Explosives and Blasting (화약ㆍ발파)

Korean Society of Explosives and Blasting Engineering (대한화약발파공학회)
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A Numerical Study on the Reduction Effect of Blasting Vibration with Cut Method

심발공법에 따른 발파진동 저감효과에 대한 수치해석적 연구

  • 손지호 (강원대학교 에너지자원.산업공학부) ;
  • 김병렬 (강원대학교 에너지자원.산업공학부) ;
  • 이승중 (강원대학교 지구자원연구소) ;
  • 김남수 ((주)NSB 나우이엔씨) ;
  • 이효 (SK 건설(주)) ;
  • 최성웅 (강원대학교 에너지자원.산업공학부)
  • Received : 2019.03.07
  • Accepted : 2019.03.19
  • Published : 2019.03.31
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Abstract

The repeated blasting vibration, which is induced commonly in NATM excavation site, can cause a severe damage to the nearby facilities. It is known that the most effective method for reducing blasting vibration includes the use of electronic detonator, deck charge and change of cut method, and so forth. In order to analyze the effect of blasting vibration reduction, in this study, three-dimensional FDM (Finite Difference Method) program FLAC3D has been used for reflecting the blasting hole, delayed time and charging amount. Also the numerical analysis has been performed by applying a dynamic load to each blasting hole. The cut method has been applied with several methods, such as V-cut and Double-drilled parallel cut, which are common in tunnel construction sites. Also, the field test blasting has been carried out in order to compare the measured data with results of numerical analysis. It was shown that the numerical analysis and the field measurement coincide well.

발파굴착을 수행하는 터널시공 현장에서, 발파진동이 반복적으로 작용할 경우 인근 보안물건에 손상을 입힐 수 있으며, 이러한 발파진동을 저감시킬 수 있는 방법으로는 전자뇌관의 사용, 분산장약, 심발공법의 변경 등이 고려될 수 있다. 본 연구에서는 수치해석 기법을 이용하여 심발공법에 따른 발파진동 저감효과를 분석하고자, 3차원 유한차분법 프로그램인 FLAC3D를 이용하여 발파공, 지연시차, 장약량 등을 수치모델에 반영하고, 발파공별로 동하중을 적용하여 수치해석을 수행하였다. 심발공법은 터널 시공현장에서 많이 사용되고 있는 V-cut 공법 및 다단평행의 심발공법을 적용하였으며, 실제 터널 시공현장에서 시험발파를 수행하여 현장의 발파진동 계측자료와 수치해석의 진동속도를 비교하였다. 수치해석과 시험발파의 발파진동은 매우 유사한 경향을 나타낸 것으로 분석되었다.

Keywords

References

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