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기계식 해체 공법을 적용한 슬래브 해체 시 발생하는 진동 해석 연구
노유송 ( You-song Noh ),석철기 ( Chul-gi Suk ),박훈 ( Hoon Park ) 대한화약발파공학회 2021 화약발파 Vol.39 No.4
In this study, the vibration data were obtained to analyze the vibration generated during dismantling of slab using the mechanical dismantling method. The obtained vibration data were classified according to the attachment device and then the waveform and dominant frequency analysis were performed. And the correlation was analyzed by the different methods of measuring the distance between the work section and the measurement point. As a result of the waveform analysis for each attachment device, there was little change in the phase of the vibration waveform and only the change in amplitude, which is the magnitude of the vibration velocity. And as a result of frequency analysis, the frequency band was lower when using a crusher method than a braker method and frequency band were close of the natural frequency of the structure to be dismantled. As a result of the correlation analysis, the separation distance was estimated a higher correlation when evaluated as the path through which the vibration propagates along the structure frame than the straight distance between the measurement point and the working section.
노유송 ( You-song Noh ),민경조 ( Gyeong-jo Min ),오세욱 ( Se-wook Oh ),박세웅 ( Se-woong Park ),석철기 ( Chul-gi Suk ),조상호 ( Sang-ho Cho ),박훈 ( Hoon Park ) 대한화약발파공학회 2018 화약발파 Vol.36 No.3
This study was conducted to evaluate the influences of the angle of artificial joints, the distance between the artificial joints and the blast hole, and the number of artificial joints on the pressure wave propagation, crack propagation, and blast wave velocity. The evaluation was conducted numerically by use of the Euler-Lagrange solver supported by the AUTODYN, which is a dynamic FEM program. As a result, it was found that the blast wave velocity was decreased most rapidly as either the distance between the artificial joint and the blast hole was decreased or the angle of the artificial joint was increased. In contrast to the case of no artificial joint, the amount of attenuation of the blast wave velocity was considerably large when an artificial joint was present. However, the effect of the number of artificial joint on the attenuation of the blast wave velocity was negligible under the given condition.
노유송 ( You-song Noh ),김래회 ( Nae-hoi Kim ),장성옥 ( Seong-ok Jang ),석철기 ( Chul-gi Suk ),박훈 ( Hoon Park ) 대한화약발파공학회 2021 화약발파 Vol.39 No.1
The number of a industrial plant that must be demolished due to functional and structural deterioration has been increased. There is an increasing application of explosive demolition or explosive demolition combined with mechanical demolition to minimize temporal and spatial environmental hazardous factors created during the process of demolition. In this case study, to demolish the industrial plant foundation, which is a reinforced concrete structure, the explosive demolition technique was conducted. As a result of the explosive demolition, the overall crushing of plant foundation structure was satisfactory, and the explosive demolition was completed without causing any damage to surrounding facilities.
기술사례 : 장약공 상태에 따른 콘크리트 기둥의 진동 전파 특성
노유송 ( You Song Noh ),김정규 ( Jung Kyu Kim ),고영훈 ( Young Hun Ko ),신명진 ( Myeong Jin Shin ),양형식 ( Hyung Sik Yang ) 대한화약발파공학회 2014 화약발파 Vol.32 No.2
A number of concrete columns were blasted using TNT to study the propagation characteristics of ground vibration caused by different loading conditions in the blast hole of the columns. For each loading condition, peak particle velocity measured on the ground was analyzed. The regression analysis revealed that the use of square blast hole results in smaller vibration magnitude and faster decaying time than the case with circular blast hole. The analysis also showed that the blasting in the closed hole leads to larger vibration magnitude than the blasting in the hole penetrating the column, whereas the difference in vibration decaying time is negligible.
3D 스캐너를 이용한 지하공동의 굴진장 및 여굴 평가 기초연구
노유송 ( You Song Noh ),김정규 ( Jung Kyu Kim ),고영훈 ( Young Hun Ko ),김승준 ( Seong Jun Kim ),정소걸 ( So Keul Chung ),양형식 ( Hyung Sik Yang ) 대한화약발파공학회 2015 화약발파 Vol.33 No.4
This study is to efficiently calculate and evaluate the elements of advance, overbreak and underbreak on the mine under the production using the 3D laser scanner. For this purpose, a 3D laser scanner was sued to acquire the point-cloud which records the space coordinates and modelling of the underground tunnel using the 3D modeling program. When each element was observed through the study result, the advance on the center cut was 2.6m in average while the total advance was 2.4m. If the drilling length of 3.8m is based, the advance rate was evaluated to be 67% in average in the center cut section with the total average of 64%. In addition, when the volume of overbreak was measured based on the design cross section, the average overbreak volume was found to be 4.5㎥ on left wall, 4.5㎥ on right wall, and 5㎥ on roof with the total volume of 14㎥. When the overbreak volume is measured based on the look-out cross section, it was 3㎥ on roof with the total volume of 8.4㎥. The rate of overbreak volume against the average excavation volume was 8% based on the design cross section and 5% based on the look-out cross section.
석철기 ( Chul-gi Suk ),노유송 ( You-song Noh ),고영훈 ( Young-hun Ko ),박훈 ( Hoon Park ),조상호 ( Sang-ho Cho ),양형식 ( Hyung-sik Yang ) 대한화약발파공학회 2016 화약발파 Vol.34 No.4
For underwater steel structure, cut that underwater shaped charge device that combines a spring hose, which is an external device of pressure resistance and flexibility with flexible shaped charge, was invented. As a basic experiment for an optimum condition design, an penetration performance was compared by external device shape. To evaluate the result of an experiment, image analysis was carried out after obtaining the model by using the liquid rubber for the penetrated steel plate. To simulate the penetrating process of shaped charge, the AUTODYN program has been used. As a result of analysis, while the average penetration depth of circular and square shaped external devices were similar, the penetration quality was more uniform in the case of circle. In addition, water infiltration occurred in square case, displacement and strain rate according to the increase of the water pressure were measured high.
박훈 ( Hoon Park ),노유송 ( You-song Noh ),석철기 ( Chul-gi Suk ) 대한화약발파공학회 2020 화약발파 Vol.38 No.2
The shaped charge was used in explosive demolition of a steel frame structure, but it was often not used because it was limited to use and impossible to supply at domestic and overseas. Existing linear shaped charge did not have sufficient cutting performance to cut steel frame structures with a huge scale and thick steel plate. To solve these problems, we produced a device that could generate metal jets using industrial explosives of high detonation velocity and pressure. In this study, we made a charging container of three types which applicable to explosive demolition of steel frame structures. The experiment of cutting performances was carried out to evaluate the effect of cutting of charging containers on the various thicknesses of the H-beam and steel plate. As a result of the experiment, sufficient cutting performance was confirmed.
박훈 ( Hoon Park ),노유송 ( You-song Noh ),남성우 ( Sung-woo Nam ),장성옥 ( Seong-ok Jang ),김래회 ( Nae-hoi Kim ),석철기 ( Chul-gi Suk ) 대한화약발파공학회 2021 화약발파 Vol.39 No.2
Recently, the demand for demolition for the unnecessary steel frame structure is increasing due to deterioration and unsatisfactory functional conditions and the major highlights of demolition issues. This execution case was intended to describe an application of the felling method as one about the suggested method for explosive demolition method of ore bin and coke bin facilities, which were steel frame structures. And we used the charging container for blast cutting of the steel frame structure. As a result of the explosive demolition, the ore bin and coke bin had collapsed precisely according to the estimated direction. And the explosive demolition was completed without causing any damage to surrounding facilities.
석철기 ( Chul-gi Suk ),노유송 ( You-song Noh ),박훈 ( Hoon Park ) 대한화약발파공학회 2017 화약발파 Vol.35 No.4
This study undertakes an evaluation of blast effect through the analysis of the contribution rate and effect that different artificial joint number, artificial joint spacing and artificial joint angle have on blast velocity. Blast velocity according to the different state of the artificial joint was obtained using AUTODYN, a dynamic analysis program. The result of the numerical analysis was subjected to further normalization analysis. For the contribution rate of design factors was analyzed using the robust design method. The orthogonal array used in the analysis was L<sub>9</sub>(3<sup>4</sup>) and each parameters were having 3 levels. The result of normalization analysis regarding the artificial joint angle was indicated a tendency in which blast velocity decreased. The result of analyzing blast velocity regarding artificial joint spacing and artificial joint angle was indicated a tendency in which blast velocity decreased as artificial joint spacing increased when the angle was perpendicular. In the case of blast velocity contribution rates they were ranked in the descending order of artificial joint angle, artificial joint number, artificial joint spacing.