Eleven Poems of Park Je-chun

Park Je-chun,Ko Chang Soo(번역자) The Academy of Korean Studies 1992 Korea Journal Vol.32 No.3

N値에 따른 地盤評價에 關한 硏究

박은규,류제천,김송만,박춘수 忠南大學校 産業技術硏究所 2002 산업기술연구논문집 Vol.17 No.1

In this paper, parameters of soil which are estimated with N-value and the results from laboratory test with the sample in construntion field are compared and analyzed. As a result, modification methods caused by existed weight is nearly same with the Equation of Liao & Whitman. Under same existed weight, the difference of N'/N is 0.9~2.1 in the Equation of Peck & Bazzaraa and Gibbs & Holtz. The Equation of O-Ja-Ki (&?'§) is more accurate with average value than any other equations in estimating a angle of internal friction of sand. The result of laboratory test is similar to the Equation of terzaghi & Peck. When unconfined compression strength of clay is estimated, the equation, q_(u) ≒ N/0.722, may represent many suggested equations. Standard Penetration Test is one of the most popular method to estimate parameters of soil because of its simplicity. Correlation between N-value and parameters of soil has been studied by many people but the absurd is still remain and we can face it on the construction field. Therefore field investigation and understanding about N-value are required when engineers estimate parameters of soil with N-value. There should be more study to get high accuracy of N-value and trustable parameters of soil.

病院 地下空間內의 空氣中 微生物分布에 관한 硏究

박천제,배병훈,고경숙,김춘희,임경택 동아대학교 환경문제연구소 1998 硏究報告 Vol.21 No.1

This study was carried out to investigate the distribution and concentration of microorganism by the method of the air contamination using RCS air sampler in underground linac room of two general hospital located in Pusan. The places of air sampling were 4 different spot in two each hopital. Therefore, total 8 places were sampled from June 30, 1996 to May30, 1997. The results obtained were as follows 1. In a agar strip GK-A media for total count of microbial particles, it was estimated to be 76 CFU/ft^(3) in ICR room, and the consulting room was 53 CFU/ft^(3), lobby was XI CFU/ft^(3), linac room was 35 CFU/ft^(3), in the M hospital, respectively. The distribution of organism in the air of M hospital were shown gram positive cocci 72%, gram negative bacilli 15%, gram positive bacilli 6.1%, fungi 6.1%, respectively . On the other hand, in P hospital, it was obtained to be ICR room 74 CFU/ft^(3), lobby- 45 CFU/ft^(3), consulting room 34 CFU/ft^(3), linac room 31 CFU/ft^(3), respectively. The distribution and concentration of microorganism in the air were detected gram positive cocci 75%, fungi 10.3%, gram negative bacilli 8.7%, gram positive bacilli 6.0%. respectively. The results were recognized to be a low frequency in the linac room. 2. In agar strip S media for total counts of M hospital, ICR room was shown the highest organism with 32 CFU/ft^(3), but the lowest organism was detected linac room with 20 CFU/ft^(3). Also, the case of P hospital was estimated high 43 CFU/ft^(3) at ICR room, low organism was shown at linac 17 CFU/ft^(3) Test of coagulase were recognized to be a negative Staphylococci 68.3% in M hospital, 60.7% in P hospital. Coagulase positive cocci was estimated to be 31.7% in M hospital, 39.3% in P hospital. 3. In agar strip C media for coliform bacteria, colony counts at ICR room 10 CFU/ft^(3), consulting room 7 CFU/ft^(3), linac room 6 CFU/ft^(3), lobby 4 CFU/ft^(3) in M hospital, respectively. On the other hand, in P hospital were shown ICR room and main lobby 7 CFU/ft^(3), consulting room 5 CFU/ft^(3), linac room 4 CFU/ft^(3), respectively.

計測을 통한 흙막이構造物 安定性 檢討에 關한 硏究

정석영,박춘수,류제천 忠南大學校 産業技術硏究所 1995 산업기술연구논문집 Vol.10 No.2

Recently, many deep excavation have been practiced in constructing building or subways in urban areas to utilize more effectively underground space. In doing such underground excavations, information-oriented construction through the field measuring is getting more important not to give damages the next buildings and to practice in safety. The earth pressure, horizontal displacement, underground water table and so on are included in the item to make sure of safety through the field measuring. The empirical earth pressure come from the strut retention. But in recent days the two reasons have made the construction having been used through anchored retention why the width of earth retaining is so wide and here is a purpose to make use wider and wider the space of work. I come to make conclusions as follow to observe the safety of earth retaining structures with horizontal displacement and underground water table and to study lateral earth pressure of anchored retention earth retaining walls with load cells on the anchored retention sites.

PIEZOCONE을 利用한 軟弱地盤 分析에 關한 硏究

류제천,박춘수,정석영 忠南大學校 産業技術硏究所 1995 산업기술연구논문집 Vol.10 No.2

In domestic research, standard penetration test and cone test have been used largely for the investigation of soft ground. But standard penetration test has been developed to apply to sand and its result is under the influence of experimenter's skill. The cone used so far has also experimental limitation in the point that penetration into stiff ground is difficult. Recently Piezocone is used world-wide for the investigation of soft ground. Piezocone makes it possible to get more acculate information upon ground because to add to the function of existing cone, it has that of measuring pore water pressure. In this thesis the result of this research is compared with that of laboratory test in the same area. In the result of study the coefficient of consolidation in the horizontal direction of investigation area is ?? and the mean of the cone factor is 15. There is little difference in the soil classification between by Piezocone test and by existing tests. If Piezocone is continuously studied, revised and amended to be suitable for domestic condition, more correct and pre cise research on soft ground will be possible.

凍結深度 算定에 대한 硏究

민홍기,류제천,김송만,박춘수 忠南大學校 産業技術硏究所 1997 산업기술연구논문집 Vol.12 No.2

Korea has the ground which freezes in winter and melts in warmer seasons by turns. Therefore, in designing civil-structures or buildings on such ground, the depth of seasonal frost penetration must be considered. In this paper, approximate contours of the maximum depth of frost penetration in Korea is presented. The National Construction Research Institute of Korea has measured the depth of the frozen ground covering all the area of South Korea during the ten years ranging through 1980. The measurement were made for the frozen ground at random but intended for the most frost-susceptible soils. The contour of the maximum depth of the frost penetration is drawn on a map with data collected during the ten years. It is known that the maximum depth of the frost penetration is related to freeze index values. An empirical formula expressing the relation is suggested, in which the depth is proportional to the one-fifth power of the air freezing index values.

軟弱地盤 壓密特性과 沈下豫測

이재식,류제천,김송만,박춘수 충남대학교 산업기술연구소 2001 산업기술연구논문집 Vol.16 No.1

Recently, developed countries have brought about a considerable increase in the study of soft ground for the reasons of policy on farming protection, key industry and sightseeing development since the middle of the nineteenth century, particularly 1950s. In spite of the long and copious experience associated with these types of construction, the constructions of soft ground still have many delicate problems. In general, problems of soft ground related to stability are probably to meet settlements on the various circumstances. In order to accelerate the rate of consolidation settlement and gain a required shear strength for a given soft ground, the preloading technique combined with a vertical drainage system has been widely applied. In this paper, laboratory tests have analyzed to change the soil parameters that executed the plan of stage construction. The void ratio and water content of the clay decreases and the strength of soft ground rises during consolidation period. In order to predict of magnitude, rate of settlement and pore pressure dissipation under embankment of loading on drainage-installed soft ground, consolidation settlement prediction methods such as Asaoka method, curve fitting method, TAN method and Hyperbolic method applied to gain final consolidation settlement from the field settlement data. The Reliability analysis of consolidation settlement prediction methods made use of additional settlement data. Sequentially, it has been found that Hyperbolic method can appropriately predict the consolidation behavior of drainage-installed soft ground of Yangsan Mulgum.

Multi Cone Nailing 工法의 地盤補强效果에 關한 硏究

김영삼,류제천,김송만,박춘수 忠南大學校 産業技術硏究所 2001 산업기술연구논문집 Vol.16 No.2

In this study, the behavior properties and the influences of design variables related to internal and external stability in soil Nailed structure are expounded. Also, the Multi Cone Nailing method, which is new soil Nailing method transformed by addition of multi Cone are introduced. This method was designed when the failure is occurred by separation of Nail and grout material. The Soil Nailing and Multi Cone Nailing by pullout test results and analyses using SLOPE/W software for the purpose of making researches into the ground reinforcing effect of Multi Cone Nailing method are compared and analyzed. In the analyses using SLOPE/W software, I intentionally determined the analyzed section which is ground strata consisting of fill and weathered soil and has 7.0m excavation height. Analyses divided by without reinforcement, reinforced by Soil Nailing and reinforced by Multi Cone Nailing respectively, and determined section and soil strata was not changed because of the purpose of studying the effect by only reinforcement differences. The results of this paper are summarized as follow. From the pullout test results, initial pullout capacity in Multi Cone Nailing increased in 15% than it in soil Nailing. And residual pullout capacity decreased in 62% than initial pullout capacity in soil Nailing, but it is the same in Multi cone Nailing. As result of analyses using SLOPE/W software, the vertical slope is failed condition when without reinforcement, but is safe when reinforced by soil Nailing or Multi Cone Nailing. The factor of safety in multi Cone Nailing increase in 20% than it in soil Nailing. Compared with in soil Nailing, strength and shear resistance following the slip surface enlarged in Multi Cone Nailing, but shear mobilized decreased in it.

굴착 주변의 지반침하 예측

김교신,류제천,김송만,박춘수 충남대학교 산업기술연구소 2000 산업기술연구논문집 Vol.15 No.2

Ground settlement and displacements of support structures due to deep excavation in urban area affect the stability of adjacent structures and retaining walls. Especially, the magnitude and distribution of ground settlements may directly give effects on the behavior of adjacent structures. So it comes to be important to judge precisely the effects on adjacent grounds and structures due to excavation. This can be achieved by means of ground settlements and differential settlements of structures, but present evaluating method on the ground settlement neglect the presence of adjacent structures. In this study, I have made Bowles and Bauer Method programs in order to find adjacent ground settlements. The results of program are like these. First, when you use measured horizontal displacement, the ratio of settlements of Bowles Method programs to Bauer is 0.86. Secondly, when you use measured horizontal displacement, settlements which Bowles Method program find is 5 times larger than settlements which Bauer Method program find when you use evaluated horizontal displacement.

다짐粘土와 자연粘土의 透水係數 豫測

김용희,류제천,김송만,박춘수 忠南大學校 産業技術硏究所 2001 산업기술연구논문집 Vol.16 No.2

The permeability means a factor to affect the movement of fluid under the gravity or the body force. the number of engineering problems, as seepage problem, calculation of settlement velocity, and slope stability, is related with the coefficient of permeability of soils. Therefore, it is very important for geotechnical engineers to understand properties of coefficient of permeability. Hence, after his study adapted Kozeny-Carman's equation to variety factors which affected the permeability of clay soils. an appropriate factor could be selected. The study came to the conclusion that the most related factor between specific surface and permeability appears to be mass of #200 passing percentage in the case of compacted clay and clay content for natural clay. For that reason, the permeability of natural clay is affected by the electric-chemical property but the compacted clay appears to be affected by the change of clay fabric, because the compaction change flocculated structure into dispersed structure to destroy the fabric of clay particle. New equation was developed to applied #200 passing percentage and clay content to Kozeny-Carman equation. The coefficient of permeability of developed equation appeared that was contented in the limit of confidence level for the measured coefficient of permeability. The developed equation can use for estimating values in the coefficient of permeability of compacted clay and natural clay. In the future one will need many studies for getting more accurate coefficient of permeability