154kv 대신 S/S 인출 전력구 시험발파 패턴 및 진동, 소음 계측에 의한 기존 CRACK에 미치는 영향 연구 = On the Study of Blasting Vibration Sound by Measuring Gage Influence to Exist Crack in 154kv Daeshin Electric Cable Tunnel

다국어 초록 (Multilingual Abstract)

This area is covered in Andesite of high compression strength and located in PUSAN SEO­KU. There are many old houses around shaft site.
So, we must have a cautious blasting operation.
A total of 40 blasts were test at DAE-SHIN Shaft site to study the magnitude and frequency characterization of blast-induced vibration.
The effect of viblating frequency on structual damage and site-specific scaling to define the empirical equations were also discussed. The results can be summarized as follows:
1. Some empirical equations were obtained.
V=K{(D/W)1/3}^(-n), where the values for n and K are estimated to be -1.407 to -2.202 and 643.3489 to 7283.2104 respectively.
2. Dominant frequencies at shot distance are in the range of about 75.0 to 91.8 Hz, with some exceptions of about 50Hz, Frequencies obseverd at long distance are in the range of 10 to 20Hz.
It is apparent the shift of dominant frequency down to lower levels at long distance.