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강대우,안봉도 한국암반공학회 2007 한국암반공학회 학술대회 및 세미나 자료집 Vol.- No.-
폭속이 서로 다른 에멀젼폭약의 특성값(폭발압력, 가스량, 폭발에너지, 폭발온도, 스트렝스)을 폭발반응 계산 프로그램인 Nitrodyn을 사용하여 구하였으며, 또한 동일 암반 조건에서 17mm약경의 폭속이 다른 3종류의 에멀젼 폭약을 시험발파 하여 얻은 진동자료를 가지고 진동의 특성을 분석하였다. 그 결과 발파원에서 40m 이내의 근거리에서는 폭속이 감소함에 따라 진동이 감소하였으나, 그 이상의 거리에서는 거의 유사하여 40m 이상의 거리에서는 진동 감소에 폭속이 큰 영향을 미치지 못하는 것으로 나타났다. We have compared a special character(pressure of explosion, gas volume, energy of explosion, temperature of explosion, strength) of different three emulsion explosives which is different velocity by Nitrodyn program that is calculated explosion reaction. We have analyzed the character of the vibration from a vibration data which is a result from test blasting in different velocity of detonation for three emulsion explosives of the same size(17mm) in the same rock. As a result, the vibration is decreased when the velocity of detonation is decreased within 40m from origin of explosion but it is familiar character over 40m, so there isn't much affect the velocity of detonation in decreased vibration over 40m.
에어 튜브(Air Tube)에 의한 발파의 진동, 폭음 및 전석 제어 영향 연구
강대우 대한화약발파공학회 2000 화약발파 Vol.18 No.3
"Air Tube" 발파공법에 대한 연구는 기존의 일반 발파 방법의 단점을 크게 보완하여, 이 에 따른 진동, 폭음(소음), 전석 발생 등 이러한 문제점들을 해결하기 위해 고안된 것으로 기존 Air Decking 기술을 응용한 것이다. 본 연구는 폭약의 하부, 폭약과 폭약사이, 폭약의 상부와 전색 사이에 일정 길이의 "Air Tube"를 장착시켜 폭약의 투사면적을 증가시키고, 진동의 감쇠와 전석이 감소되어 특히 도심지에서 발생하는 민원의 대상이 될 수 있는 진동 및 폭음도 크게 줄일 수 있는 효과적인 발파 기술이다.일 수 있는 효과적인 발파 기술이다.
姜大雨 동아대학교 건설기술연구소 1996 硏究報告 Vol.20 No.1
Recently thermal properties of rocks have been highly concerned in geothermal energy development and in many field of engineering. An experimental apparatus based on the transient hot wire comparison method was built for measuring the thermal conductivity of both plate and curved surface. A new method was developed for deforming the time range necessary for calculation of the thermal conductivity in order to measure it accurately. The range is determined by using the second derivative of hot wire temperature with respect to logarithm of time. The thermal conductivity of samples was measured in an airconditioned room. The thermal conductivity of metal materials is able to be measured both in the plate and model in the curved surface model within ±17% accuracy and in case of none-metal material is able to measured with in ±7.5% accuracy. Therefore, we can be easily obtained a new measuring method of thermal conductivity of curved curved surface in coring material.
154kv 대신 S/S 인출 전력구 시험발파 패턴 및 진동, 소음 계측에 의한 기존 CRACK에 미치는 영향 연구
강대우,박태원 동아대학교 건설기술연구소 1998 硏究報告 Vol.22 No.1
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.
강대우,안봉도 동아대학교 건설기술연구소 1998 硏究報告 Vol.22 No.1
This study aims, at applying the optimal shaft blasting patterns in the urban area, Vibrations were measured with and without vibration reduction methods at a urban site in Pusan. The results were analyzed with respect to scaled distance, frequency distribution, and blasting pattern. The conciusions are as follows: 1. The relationship formula between vibration velocity and scaled distance are found with the confidence level of 95%. without reduction methods : V_(95)=4041.3350(SD)^(-1.717) (square root) V_(95)= 2229.0863(SD)^(-1.717) (cube root) with reduction methods : V_(95)= 563.3637 (SD)^(-1.192) (square root) V_(95)=436.6020(SD)^(-1.253) (cube root) 2. The main frequency of vortical component Is found to the higher than in 100Hz in most of the measurements, while the transverse component has the main frequency lower than 60Hz, in the meanwhile, it is hardly found in the case of longitidual component. 3. Measurements were made at a bulding approximately 5m apart from the blasting site. The blasting pattern with vibration reduction methods shows much lower vibration. The reduction magnitudes are 12.7% for the squre root formula and 13.8% for the cube root when the thres hold limit value in set at 10mm/sec. Comparisions are made with the same charging weight per delay at the same distance.
발파 신기술의 미국 수출 : 에어튜브를 이용한 암반 발파 방법
강대우 東亞大學校 建設技術硏究所 2006 硏究論文集 Vol.30 No.1
20여 년 전 동아대학교 강단에서 ‘자원개발공학’이란 과목의 일부에 발파공학이 있었으나 국내에는 전문가가 그리 흔치 않은 시기에 이 분야를 독학하다시피 하며 연구한결과가 오늘 큰 성과의 밑거름이 되었다고생각한다.
姜大雨 동아대학교 공과대학 부설 한국자원개발연구소 1988 硏究報告 Vol.12 No.2
Thermal properties of rocks at elevated temperature and high pressure have been highly concerned in geothermal energy development and in many fields of engineering. These samples are measured by a needle probe method. Temperature dependences of the thermal conductivity of 21 core samples with the increase and decrease of temperature are presented in the temperature range from 30 to 460℃. The experimental temperature data to yield values of the thermal conductivity is obtained in about fifteen minutes. Temperature dependence of the thermal conductivity increases with the increase of temperature and decreases with the decrease of temperature. The range of the thermal conductivity of core samples presents from 0.5(w/m.k) to 2.4 (w/m.k) at the experimental temperature. Mudstone, pumice tuff, lapilli tuff, dacite, Sandy tuff and tuff breccia were nearly the same thermal conductivity. Fine grain tuff can be distinguished by the thermal conductivity of the increase and decrease of temperature.