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Title |
A Study on the Effect of the Stemming Hole medium to the Blasting Separation Distance of Structure
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Authors |
강희섭(Hee-Seop Kang) ; 정중규(Jung-Gyu Jeong) ; 방명석(Myung-Seok Bang) |
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DOI |
https://doi.org/10.11112/jksmi.2017.21.1.100 |
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Keywords |
발파시험 ; 공내 매질 ; 이격거리 ; 진동속도 ; 발파진동추정식 Test blasting ; Stemming hole medium ; Separation distance ; Vibration velocity ; Predicted vibration velocity equation |
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Abstract |
Because of urbanization, Industrialization and expansion of transportation network, blasting works are recently increasing in construction field. The blasting work influences environmental effects to residents and the safety of facilities around the working place, so the development of blasting technology is needed to reduce the damage to residents. The blasting mechanism in the hole was studied and tested in the blasting sites by the difference of diameter between explosives and drilling hole, which is named by the decoupling effect. This effect was tested by changing the medium between explosives and hole wall in three working sites(railway, highway and industrial complex). The vibration velocity of blasting was recorded and vibration equations were produced by regression analyses. Finally, the structure separation distance was derived using these equations. The testing results show that the specific gravity of medium is larger, the separation distance is smaller and the duration time of blasting is shorter in case of large specific gravity of medium, so the vibration effect stops more fastly in the water compared with the air.
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