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S 화력발전소 3, 4호기 증설에 따르는 정밀발파작업으로 인한 인접가동발전기 및 구조물에 미치는 진동영향조사
허진,Huh Ginn 대한화약발파공학회 1991 화약발파 Vol.9 No.4
The cautious blasting works had been used with emulsion explosion electric M /S delay caps. Drill depth was from 3m to 6m with Crawler Drill 70mm on the calcalious sand stone (soft-moderate-semi hard Rock) . The total numbers of feet blast were 88. Scale distance were induces 15.52-60.32. It was applied to Propagation Law in blasting vibration as follows .Propagtion Law in Blasting Vibration V=k(D/W/sup b/)/sup n/ where V : Peak partical velocity(cm/sec) D : Distance between explosion and recording sites(m) W ; Maximum Charge per delay -period of eight milliseconds or more(Kg) K : Ground transmission constant, empirically determind on the Rocks, Explosive and drilling pattern ets. b : Charge exponents n : Reduced exponents Where the quantity D/W/sup b/ is known as the Scale distance. Above equation is worked by the U.S Bureau of Mines to determine peak particle velocity. The propagation Law can be catagrorized in three groups. Cabic root Scaling charge per delay Square root Scaling of charge per delay Site-specific Scaling of charge delay Charge and reduction exponents carried out by multiple regressional analysis. It's divided into under loom and over loom distance because the frequency is varified by the distance from blast site. Empirical equation of cautious blasting vibration is as follows. Over 30m--under 100m----V=41(D/ W)/sup -1.41/-----A Over l00m---------V=121(D/ W)/sup -1.56/-----B K value on the above equation has to be more specified for furthur understand about the effect of explosives. Rock strength, And Drilling pattern on the vibration levels, it is necessary to carry out more tests.
허진,Huh Ginn 대한화약발파공학회 1991 화약발파 Vol.9 No.2
The Problem of vibration Inflence to housing Construction fields has arised at the begining of 1970, at That time I used Lion(VM -l2B) which recorded only dB Demension. On the 1980's I have been used lnstantel made blastemate(DS-477), modern Instrument for measuring speed, Acc, frequency and placement. but The most of Jobsite used Lion I Carried out the empirical equation of conversion dB to cm /sec as follows. Single free face : dB = 140PPV + 30 double free face : dB = 143PPV + 20 Above equation Could apply on Rock type 3(soft rock)
애드벌룬이 실내 폭파로 인하여 5층 건물이 $\frac{1}{150}$도 이내로 기울어 졌다.
허진,Huh Ginn 대한화약발파공학회 1994 화약발파 Vol.12 No.3
The primary court house judged that 5th floor's Bldg, structure were inclined 1/150 degree to west-ward by Explosion of Ad, Balloon in the Room. Surveyor made the report to denied the Judgement of primary court. With evidently and Theoritically. but It is waiting the juge of higher court house. Explosion pressure ${\Delta}p$ is as follows $\Delta{p}=4.2100{\times}{\lambda}^{-1.38}=4.2100{\times}{45}^{-1.38}=4.210{\times}{0.00487}=0.02kg/cm^2$.