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김희도 ( Hee Do Kim ),김정규 ( Jung Kyu Kim ),고영훈 ( Young Hun Ko ),노유송 ( You Song Noh ),신명진 ( Myeong Jin Shin ),양형식 ( Hyung Sik Yang ) 대한화약발파공학회 2015 화약발파 Vol.33 No.1
In this study, the domestic bench blasting sites were researched to set the blast coefficient C according to the type of rock and type of industry. With the use of the experimental data on the representative industrial explosives and the data of the manufacturers’data on explosives, powder coefficient e was set up. The blast coefficient C was 0.21~0.30 when the average value for 5 representative kinds of rocks including granite was searched. The blast coefficient C for quarrying, mining and construction sites were 0.22, 0.13 and 0.26 respectively. On the other hand, powder coefficient e was obtained in four elements such as reactive energy, ballistic mortar test, VOD, Langefors’strength per unit weight. e value for emulsion which is one of the representative explosives was found to be 1 while those of high performance emulsion and ANFO were found to be 0.9 and 1, respectively.
김희도 ( Hee Do Kim ),이준원 ( Joon Won Lee ) 대한화약발파공학회 2014 화약발파 Vol.32 No.1
The overall management for explosives in domestic and regulation for blasting is managed by the control Act of guns, sword, explosives etc. On the details for handling and method, delivery, storage, use and management for explosives and work safety for the accident prevention is recommended to the related business site through Standard safety work guideline of blasting which set by safety & health 27 Act handling. In this study, It reviews the standard safety work guideline of blasting notified by Ministry of employment & labor. We propose the new products introduced into domestic explosives market, definition of explosives word when the newest blasting technology is revised, emulsion explosives, bulk explosives and electronic detonators which increased in the latest. Indeed, We propose a typical handling method of non-electric detonator and electronic in order to make the renewed Standard safety work guideline of Blasting on work guideline.
김희도 ( Hee Do Kim ),최성현 ( Sung Hyun Choi ) 대한화약발파공학회 2008 화약발파 Vol.26 No.2
Bulk Emulsion blasts using mechanized charging system, which is generally used in foreign countries, have recently introduced and gradually increased in Korea. The Bulk Emulsion are safe and able to increase the charging density for improvement of fragmentation and advancement especially in tunneling, and minimizing enviromental problem. Because of less toxic gas generation, the explosives are called, namely ech-friendly products. There are two kinds of Bulk Emulsion; one is for open cut and the other is for tunneling. According to features of blast sites and its purpose, the compositions are different, but the principle is the same. In this study, trial blasts using Bulk Emulsion for tunneling had executed at 10 sites in Korea. The major result of the major job-sites is the following. First of all, compared with cartridge explosive, Bulk Emulsion was able to increase its charging density up to 35~60%, to decrease the blast holes to approximately 10~30% down, and the advancement was improved up to 8~20% and also 30% up in its fragmentation. Toxic gas production after cartridge blasting showed 34.44ppm of its CO. Bulk Emulsion, however, showed 20.13ppm, which was 58.45% production of the cartridge explosive, and NOx was below 2ppm. The mechanized charging system of Bulk Emulsion should be applied to large sized tunnel blasting, long advanced tunnel which can secure the advancement of over 4~5m, and the sites required finishing rapidly.
기술사례 : 터널 장공발파에서 굴진율 개선 및 작업공정 시간 단축 사례
김희도 ( Hee Do Kim ),이준원 ( Jun Won Lee ),이하영 ( Ha Young Lee ) 대한화약발파공학회 2013 화약발파 Vol.31 No.2
Generally, The way of long hole blasting is carried out in coal-face, basic excavation for dam, mine etc. Recently, this long hole blasting has been implemented in civil engineering for efficiency & economic feasibility. National express no.600 of Pusan outer high-express ○ construction site with four lanes of the length of 8km was also a site applied by long hole blasting. But After blasting, tunnel advance rate is less than 75%. As a result of that, Follow-up working time is influenced. Thereby, The total of working process is significantly so increased that planned excavation cannot be implemented many times. For not only improve excavation rate but reduce working process time in job site, we introduce blasting case which apply the 36mm explosive suited for high desity of charging among long hole blasting in order to overcome mentioned problem.
기술사례 : 수직구 굴착시 전자뇌관을 이용한 Deck-Charge 발파 시공사례
김재홍 ( Jae Hong Kim ),김희도 ( Hee Do Kim ),이준원 ( Jun Won Lee ),김갑수 ( Gab Soo Kim ),손영복 ( Young Bok Son ),김재훈 ( Jae Hoon Kim ) 대한화약발파공학회 2013 화약발파 Vol.31 No.1
This case study deals with an excavation blasting carried out at “Sooseo-Pyeongtek ○-○ section construction site”in the vicinity of residential area. Originally, the sequential blasting (multi-stage blasting) using electric detonators was planed in this area. However, there was a concern that the sequential blasting method could increase the construction cost by delaying the construction period due to possible complaints from local residents. As an alternative, electronic deck blasting technique was taken in order to meet the ground vibration regulation (0.2cm/s, in apartment area) and to keep the construction schedule. The performance of the electronic deck charge blasting was two times better than the sequential blasting with electric detonators and the level of ground vibration was also within the regulatory value (0.2cm/s). In particular, it was shown that the use of electronic detonater eDevII, which was developed for tunnel, could provide more convenient and electrically safer working condition.
기술사례 : 전자뇌관을 이용한 터널발파의 근거리 지반진동 특성
김용표 ( Yong Pyo Kim ),김갑수 ( Gab Soo Kim ),손영복 ( Young Bok Son ),김재훈 ( Jae Hoon Kim ),김희도 ( Hee Do Kim ),이준원 ( Jun Won Lee ) 대한화약발파공학회 2013 화약발파 Vol.31 No.1
In order to control tunnel blast vibration for adjacent facilities using electronic detonator, Understanding about the characteristics of near-field ground vibration is necessary. The purpose of this paper is to analyze effects of Cut-area and Extension-area vibration in relation to decision of tunnel blast vibration. These data were obtained at the top monitoring positions while OOO tunnel site of “Wonju~Gangneung double railroad section OO construction” was passing under the existing road. Thus, tunnel blasting was conducted by tunnel electronic blasting system with 0.01% high delay-time accuracy. It can be possible that not only keeping maximum charge per delay-time but also preventing amplification of vibration which is occurred by delay-time scatter using common detonators. Additionally, V-Cut was changed into Burn-Cut. The results was presented that vibration level of extension-holes were higher than Cut-holes. Therefore, near-field ground vibration can be effectively minimized using electronic detonators in the Cut area. And also more effective way to reduce tunnel blast vibration is full-face blast using electronic detonators.