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장형두(Hyong-Doo Jang),양형식(Hyung-Sik Yang) 한국암반공학회 2010 터널과지하공간 Vol.20 No.1
총 7단 105 m 높이의 대규모 절개면을 가진 석산에 대하여 안정성 해석을 하였다. RMR, SMR 해석과 함께 FLAC/slope를 이용하여 지하수위의 변화에 따른 안정성 해석을 실시하였다. 해석결과 안산암 부분에 파괴의 위험성이 나타났으며 습윤 시 안전율이 낮게 나타나서 soil-nailing과 같은 대책이 필요한 것으로 나타났다. 사면의 안정성은 지하수위에 따라 크게 변하여 지하수위에 대한 정밀한 조사가 필요한 것으로 판단되었다. A quarry with 105 m height large cut slope was analyzed. Beside RMR and SMR methods, FLAC2D were adopted to analyze slope stability. As a result, slope of andesite had a possibility of failure. Wet slope showed low safety factor. Soil nailing was recommended to solve it. Since safety factor of slope largely depend on underground level, investigation for it seemed necessary.
장형두(Hyong-Doo Jang),양형식(Hyung-Sik Yang) 한국암반공학회 2011 터널과지하공간 Vol.21 No.5
RMR은 국내터널의 지보재 설계를 위해 가장 빈번하게 사용되는 암반분류 방법이다. 그러나 설계당시의 검토된 지반조사를 통한 RMR값은 지반을 정확하게 대변할 수 없다. 터널 시공시 발생하는 붕괴 및 낙반사고를 사전에 예방하고 효율적인 지보 설계를 위해 붕괴위험도에 따라 기존 RMR 점수에 가중치를 적용한 Weighted-RMR(W-RMR)을 제안하고 터널에 적용하였다. 비재터널 현장에 W-RMR을 적용한 결과 막장 붕괴의 위험도에 따라 지보 설계를 탄력적으로 변경할 수 있었다. RMR is most strongly adopted rock classification method to scheme support system in domestic tunnel. However the RMR which is based on geological survey during design stage of tunnel can't present the real ground accurately. In this study authors suggested Weighted-RMR (W-RMR) which is considered weighted value of risk factors of collapse due to prevent collapse and roof falls during tunneling. According to the application of W-RMR to Bye-Gye tunnel we could change support type flexibly by the risk factors on a face of tunnel.
Lead Plate Blast Pressure Meter를 이용한 근거리 기폭의 발파압 계측
고영훈(Young-Hun Ko),장형두(Hyong-Doo Jang),양형식(Hyung-Sik Yang) 한국암반공학회 2012 터널과지하공간 Vol.22 No.1
Deformation of Lead plate blast pressure meter were measured after they were exposed to surface blasting. Blasting pressure was determined by comparing the data with calibration graph which was drawn from the laboratory experiments with gas gun of Hopkinson bar tester. The results were compared with calculated values from the equations of CONWEP (Conventional Weapons Effects Program) and DDESB (Department of Defence Explosives Safety Board). Measured values were lower than calculated values in near field. Gradual decaying tendency of the pressure was observed. It means that estimated blasting pressure of very near field with theoretical equations can be uncertain.
콘크리트 박스거더 교량의 발파해체를 위한 교량모형 해체실험
양형식(Hyung-Sik Yang),장형두(Hyong-Doo Jang),고영훈(Young-Hun Ko) 한국암반공학회 2011 터널과지하공간 Vol.21 No.2
콘크리트 블록에 대한 붙이기 발파실험과 더불어 콘크리트 박스거더 교량의 모형에 대하여 발파해체실험을 실시하였다. 장약으로는 폭발위력의 기준 약으로 사용되는 TNT를 사용하였다. 실험결과 콘크리트 박스거더 교량의 경우 폭약설치지점의 폭발력뿐 만 아니라 박스거더 내부 벽에 작용하는 폭풍압도 해체에 영향을 미치는 것으로 나타났다. Along with series of concrete block experiments, a demolition experiment was conducted for a scaled concrete box girder bridge to investigate collapse and blast behavior. Tri nitro toluene (TNT), the standard explosive for strength was adopted as concussion charge. The result show that demolition was caused by not only direct detonation pressures at charging spots but also blast pressures at inner wall of concrete box girder.
양형식 ( Hyung Sik Yang ),장형두 ( Hyong Doo Jang ),고영훈 ( Young Hun Ko ),김승준 ( Sung Jun Kim ),문희숙 ( Hee Sook Moon ) 대한화약발파공학회 2011 화약발파 Vol.29 No.1
Concussion shots were conducted for SS400, a general structural steel, and SM490, a structural steel for welding, using TNT, which is used as a standard explosive. The ability to cut the steels was compared for different combinations of charges and materials. The results show that the amount of explosives used for SM490 requires more 30% than SS400.
양형식 ( Hyung Sik Yang ),장명환 ( Myoung Hwan Jang ),장형두 ( Hyong Doo Jang ) 대한화약발파공학회 2010 화약발파 Vol.28 No.1
Explosive welding was planed in a closed drift of a mine for its reuse. In this study, we analyzed the stabilization of roof and pillar which were expected to be affected by overpressure experienced during the continual explosive welding. Three equations, normal equation, CONWEP and DDESB, were used for the estimation of overpressure. The investigation shows that the continual use of the explosive welding in a drift may result in considerable damage on the drift.
기술보고 : 스파크 트리거에 의한 비전기식 뇌관의 기폭 시스템
유선진 ( Seon Jin Yu ),강대진 ( Dae Jin Kang ),김남수 ( Nam Soo Kim ),장형두 ( Hyong Doo Jang ),양형식 ( Hyung Sik Yang ) 대한화약발파공학회 2011 화약발파 Vol.29 No.1
Non-electric detonator has been used in underground excavations because of its strong resistance against electric impacts. However, electric detonator is often used to initiate the non-electric detonator instead of using an exclusive non-electric blasting machine due to economical reason. Spark Trigger is introduced as a solution of unexpected explosive hazard from using an electric detonator as an initiator of non-electric system. Since Spark Trigger System does not need expensive tube and no plastic waste is left, this system is proved to be more economical and eco-friendly initiate system than the standard non-electric initiating system.
기술사례 : 제주도 현무암에서 파쇄도 향상을 위한 최적 발파 설계 연구
양형식 ( Hyung Sik Yang ),김남수 ( Nam Soo Kim ),장형두 ( Hyong Doo Jang ),김원범 ( Won Beom Kim ),고영훈 ( Young Hun Ko ),김승준 ( Seung Jun Kim ),김정규 ( Jeong Gyu Kim ),문희숙 ( Hee Sook Moon ) 대한화약발파공학회 2011 화약발파 Vol.29 No.2
Recently on Jeju island there has been a lot of development and construction. However random distribution of porous basalt and clinker seam generated from volcanic activities often interrupt and greatly reduce efficiency of blasting necessary for construction. Three test blasts were operated to solve the inefficiency problem and results indicated that a powder factor of 0.40~0.45 kg/cm3 is necessary to increase the efficiency of blasting. Also the blasting scheme should be concerned whether clinker seams exists in excavation levels or not.
기술사례 : 국내 소규모 규석광산의 파쇄효과 향상을 위한 발파패턴 연구
양형식 ( Hyung Sik Yang ),김정규 ( Jeong Gyu Kim ),고영훈 ( Young Hun Ko ),김승준 ( Seung Jun Kim ),문희숙 ( Hee Sook Mun ),김원범 ( Won Beom Kim ),장형두 ( Hyong Doo Jang ) 대한화약발파공학회 2012 화약발파 Vol.30 No.1
Fragmentation is one factor to affect productivity and economic efficiency of mine. Authors investigate the blasting pattern and improve it step by step while observing the fragmentation results. Final pattern was suggested and the fragmentation improved 24 % compared to traditional pattern, with 50 % is passing rate.