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발파공 사이의 지연시차와 기폭위치가 지반진동에 미치는 영향

Influence of Delay Time and Priming Location on the Blast-Induced Ground Vibration

  • 강추원 (조선대학교 공과대학 에너지자원공학과) ;
  • 류복현 (케이피에코이엔씨) ;
  • 최태홍 (도올발파기술사사무소)
  • 투고 : 2014.02.05
  • 심사 : 2014.02.21
  • 발행 : 2014.02.28

초록

본 연구는 현재 제품화 되고 있는 뇌관의 지연시차인 20, 25 ms의 지연시차와 기폭위치(정기폭, 중간기폭, 역기폭)에 따라 발파에 의한 지반진동의 전파특성을 파악하기 위해 공간격, 저항선, 천공장 그리고 장약량을 달리하여 총 4회의 시험발파를 실시하여 지반진동 예측식을 도출하였다. 도출된 평균 지반진동 예측식을 통해 지연시차와 기폭위치에 따른 최대입자속도의 노모그램 분석을 통해 진동특성을 규명하였고, 국토교통부의 "도로공사 노천발파 설계 시공 지침 및 요령"에 제시된 표준발파공법의 공법별 경계 기준 장약량인 0.5, 1.6, 5, 15 kg을 적용하여 진동중가율을 비교분석하였다. 그리하여 장약량에 따라 진동제어에 유리한 발파방법을 제안하여 발파설계의 인자로 사용할 수 있도록 하였다.

In order to identify the characteristics of the propagation depending on delay time (20, 25 ms) and priming location (top priming, middle priming, bottom priming), test blasts were carried out a total of 4 times using different spacing, burden, drilling length, charge per delay and was derived the formula to predict blast vibration. This study investigated the characteristics of vibration by analysis of the nomogram and prediction of Peak Particle Velocity (PPV) from delay time and priming location by the formula to predict ground vibration. And it analyzed the trends of vibration increase by standards charge 0.5, 1.6, 5, 15 kg. Standards charge is "Blasting design and construction guidelines to road construction" by the Ministry of Land, Infrastructure and Transport. Depending on the charge in favor of vibration control method is proposed. Thus, when the design was to be used as a variable.

키워드

참고문헌

  1. Dupont Co., 1980, Blaster's Hand Book, 16th Edition, pp. 209-212.
  2. Kim, J.W., C.W. Kand and C.S. Ko, 2012, Influence of Inner-hole Priming Location on Ground Vibration, Explosive & Blasting, Journal of Korean Society of Explosive & Blasting Engineering, Vol. 30, No. 1, pp. 29-36.
  3. Ministry of Land, Infrastructure and Transport, 2006, Blasting design and construction guidelines to road construction.
  4. Song, Y.S., Y.J. Lee, H.D Min. and Dave Kay, 2004, A Case Study of Applying Electronic Detonator in Limestone Quarry, Explosive & Blasting, Journal of Korean Society of Explosive & Blasting Engineering, Vol. 22, No. 2, pp. 1-11.
  5. Wang Zhenyu, Cheng Fang, Yinl Chen and Weifeng Cheng, 2013, A comparative study of delay time identification by vibration energy analysis in millisecond blasting, International Journal of Rock Mechanics & Mining Sciences, Vol, 60, pp. 389-400. https://doi.org/10.1016/j.ijrmms.2012.12.032