岩石의 力學的 性質에 미치는 液體의 影響에 關하여

朴洪民,金永錫,金昇坤 전북대학교 공업기술연구소 1980 工學硏究 Vol.10 No.-

An investigation into the effect of liquids (water, glycerine, ethylene glycol, nitrobenzene, ethyl alcohol, benzaldehyde, and n-butyl alcohol) on the uniaxial compressive strength and the strain measurment of Chun-ho Mt. limestone was made. The main results are as follows : 1. The uniaxial strength of the test pieces represents the largest value when the test piece is dry and the smallest when it is saturated with water. 2. Experimental evidence suggests that as the dielectric constant and surface tension of the liquid increases, the compressive strength and the strain of limestone decreases

Wide Space 發破의 最適 破碎 機構에 關하여

朴洪民,李相恩 全北大學校 1994 論文集 Vol.37 No.-

This study is performed to know the blasting mechanism and optimum fragmentation by the variation of the ratio of spacing and burden(S/W) and breaking areas(S×W) in Alter-nate Multi-row Hide Space hole pattern. For the experiments, cement mortar specimens are used. The results are summarized as follows ; ① The optimum spacing to burden ratio to get the best fragmentation depends on the blast- ing area(burden×spacing) when concentration of charge is kept constant. ② The reduction of burden increases the cracking by reflected tensile stress wave. ③ Wide space hole pattern causes effective full crack development with less cut-off by the cracks of previous round.

高溫岩石의 熱的 性質에 關한 硏究

朴洪民,金永錫,金昇坤 全北大學校 1979 論文集 Vol.21 No.-

Rock specimens were heated up to 1,300℃ at the rate of 50℃/10min. Photographs were taken at every 200℃ to observe the change of rock texture and following results were obtained. 1. Cracks were developed at 600℃ for granite and at 800℃ for limestone, while slight cracks were observed at 1,000℃ for sandstone, gneiss and shale. 2. The temperature at which rocks begin to melt was different depend on the kind of rocks, But all rocks were melted at 1,200℃. 3. Rock specimens were heated up to 1,300℃. It was found that gneiss and shale melted completely and changed to glass state at surface, while limestone changed to powder and granite retained its original form.

韓國無煙炭의 炭化度와 水分

朴洪民,金溢中 全北大學校 附設 都市및環境硏究所 1987 都市 및 環境硏究 Vol.2 No.-

The moisture contents of anthracites are larger and more variable than bituminous coals, and the relation between the degree of carbonization and moisture contents is so complicated that is not yet brought to light. We investigated the moisture contents of some Korean anthracites and considered the connection of the moisture content with the unit specific gravity, fuel ratio and ash content.

萬德山 및 天壺山 一帶의 石灰岩 調査報告

朴洪民,南基庠,金永錫 全北大學校 1969 論文集 Vol.11 No.-

The writers have investigated the limestone which is reserved in Mt. Manduk and Mt. Chunho. The geographic coordinate of Mt. Manduk is about N. latitude 35°47'-35°49' and E. longitude 127°13'40"-127°17'50", that of Mt. Chungo is about N. latitude 36°2'30" and E. longitude 127°7'. The main purpose of this investigation is to find geological structure and industrial mineral. Geology of around Mt. Manduk consists chiefly of Manduksan formation of Cretaceous and Quaternary. The most limestone is reserved in Manduksan formation, a few limestone dyke is reserved in between schistose granite and Manduksan formation, and that of Mt. Chungo consists of schist group(Muscovite, Biotite schist group) and limestone of Cretaceous.

深部開發에 따른 坑內의 熱問題

朴洪民 全北大學校 1981 論文集 Vol.23 No.-

More intensive mechanization and greater depths of workings are compelling mining engineers to know how to assess and control the environmental problems. In Korean coal mine, one of the most important problems which confronts the mining engineer today is that of wining coal under greater depth conditions, and during next some years this problem will become more urgently. It is the importance to amass knowledge and understanding of the problem against that day so that we are prepared that to tackle it effectively when the time comes. The purpose of the paper is to summerize the main results of researchs in mine environmental conditions, especially with reference to the assessment of underground heat and humidity. The three main sections of the paper deal with 1) the sources of heat and moisture in mine workings, 2) the physiological reactions of men working in hot environments and the methods of assessment that have been developed, and 3) the contol of high air temperatures, with particular reference to ventilating techniques.

坑內作業에서의 發塵量과 抑制對策 (1)

朴洪民 全北大學校 1966 論文集 Vol.7 No.-

效果的 坑內運搬의 改善方案 : 디젤기관을 도입시킨 경우(第1報) In a Case of Using a Diesels(1st Report)

朴洪民,金永錫 전북대학교 공업기술연구소 1979 工學硏究 Vol.9 No.-

The authors have a summarized of the characteristics of underground diesel equipments that are widely used today. The authors have a summarized of the characteristics of underground diesel equipments that are widely used today. 1. The recent rapid increase in the use of diesels underground has been the result of three important advantages offered by diesel power safety, flexibility and economy. 2. The diesel exhaust is cleaner than an automobile in terms of toxic gases. Fumes from explosives used in mining methods can be several times more dagerous than diesel exchaust. 3. It is clear that all the gaseous pollutants in a diesel engine exhaust can be diluted to well within safe exposure limits by a relatively low ventilating air current. 4. Practical experience and currently available medical data indicate there is no significant hazard associated with the gaseous toxicants. 5. A Permissible diesel can operate quite safely in relatively high concentration of methane gas than any other piece of mobile machinery currently used in gassy coal mines. 6. The safety features in most current equipment make diesels even safer than in the past and statics shows diesel have been safer that electrical equipment. 7. The combination of catalytic scrubber and new cyclonic water scrubber in series will go a long way in reducing the potential hazards associated with the carbon monoxide, unburned hydro-carbons and particulate matter in diesel exhausts. 8. The Bureau of Mines and MESA continue to collect date relevant to the use of diesels undergrouds, so more precise information on ventilation requirements and operational procedures can be developed. It should be possible to introduce suitable regulations to govern the construction and operation of diesel equipment underground.

花崗岩 採石의 經驗則와 花崗岩의 力學的 性質

박홍민,이상은 全北大學校 1992 論文集 Vol.34 No.-

Granites contain many micro-defects which oriented preferentially along with the direction of three crossed surface such as rift plane, grain plane and hardway plane. These micro-defects affect on the physical properties of the granite. Quarryman use the micro-defects structure which is called "Kyeol" in quarring the granite. However, this method is not established neither scientifically nor theoretically. Therefore, this study was performed to establish basic theory of the granite quarring from empirical function of the quarryman. For this purpose, the granite is sampled from Iksan(Hamyeol) and Jinan(Yongdam). In the three directions of "Kyeol", p-wave velocity(Vp) and tensile strength (σt) was measured every ten degree in the diametric direction and the preferred orientation of micro-defects was observed through the poralized microscope with the thin section. The results are summerized as follows. 1) P-wave velocity and tensile strength of rift plane, grain plane and hardway plane while there was a diference to some degree indicates in order of R. G and H plane commonly, and show the harmony vibration of the 180° cycle. 2) Three dimensional Vp and σt presume in the form of anisotropy cross at right angles. 3) In the observation of defect structure, cracks which grow parallel to each plane were confirmed. Depend on the degree of these cracks anisotropy of granite recognized.

發波技術의 進步에 관해서

朴洪民 全北大學校 1970 論文集 Vol.12 No.-