농촌용 수로의 유형에 따른 토사 퇴적량 예측

송창섭,임성윤,Song, Chang Seob,Lim, Seong Yoon 한국농공학회 2014 한국농공학회논문집 Vol.56 No.6

Development of the economic methods and the design of the standard sections needs the more project fund and land than ever leads to the objection of enlarging canal arrangement to need economic construction method development and standard design for supporting it. The objective of this study was to evaluate the performance of selected sediment reduction methods to reduce sediment discharges from drain and irrigation of different land types (Mountain, Flatten, Reclaimed land). This study was carried out to analysis for the soil loss and sediment of drain and irrigation by comparing RUSLE method and amount of sediment from amount of dredging data of Korea Rural Corporation. The results of study were analyzed and summarized as follow. Size of soil sediment from the upper region of drain and irrigation of mountains bigger than lower region. But in case of flatten and reclaimed land, size of soil sediment from the upper and lower region of drain and irrigation did not classified. In case of comparison drain and irrigation without classifying of land type, size of soil sediment from irrigation is bigger than drain.

미끄럼 방지 제동장치용 솔레노이드 밸브의 모델링에 관한 연구

송창섭,양해정,Song, Chang-Seop,Yang, Hae-Jeong 한국정밀공학회 1995 한국정밀공학회지 Vol.12 No.12

Anti-lock Brake System has been developed to reduce tendency for wheel lock and improve vehicle control during sudden braking on slippery road surfaces. This is achieved by controlling the braking pressure avoiding wheel lock, while retaining handling and brake performance. This paper is concerned about characteristics of a solenoid valve in hydraulic modulator for controlling brake pressure. First, it was modeling the electromagnet by the permeance method. Second, it was modeling the commercial Maxwell poackage program. And then, a experiment was performed in order to justify modeling. The result of modeling coincided with teh result of experiment and commercial packabe program. As a result, these modelings will be able to use in analysis of dynamic character- istics of the solenoid valve for braking.

간척지 온실기초 나무말뚝의 인발저항력 예측을 위한 실내모형시험 결과 비교·분석

송창섭,김명환,장웅희,Song, Chang Seob,Kim, Myeong Hwan,Jang, Ung Hee 한국농공학회 2016 한국농공학회논문집 Vol.58 No.2

The object of this paper was to evaulate modified proposed design equation in model test result in order to estimate uplift-resistance of timber pile of reclaimed land greenhouse foundation. Uplift resistance result of model test was increased to according to increased of contact area. Uplift-resistance result of field test tend to lineary increased to according to increased of embedment depth and contact area. Results of field uplift-resistance was evaluate compare with modified proposed design equation results of model test and Effective stress method. As the Effective stress method tend to underestimate, modified proposed design equation results of model test tend to similar type. As the contact area increase, difference between field uplift-resistance results and modified proposed design equation results of model test was considered uplift-speed.

흙-수분 특성곡선 방정식을 이용한 포화도의 예측

송창섭,Song, Chang-Seob 한국농공학회 2004 한국농공학회논문집 Vol.46 No.6

The aim of the work described in this paper was to confirm the application of the equation of the soil-water characteristic curves on an unsaturated soil. A series of suction test for unsaturated soils was conducted on the selected 4 kinds of soil using modified pressure extractor apparatus. And it was carried out to analyse The experimental parameters which can be describe the soil-water characteristics, were determined by using the data obtained from the experiment. From the results, it was found that The matric suction varied according to the grain size distribution, amount of fine grain particles and void ratio. Also it was found that the residual degree of saturation was decreased with in crease of the void ratio, but the pore size distribution index and air entry value were increased with in crease of the void ratio. And The application of the soil-water characteristic curve equation was confirmed for the various conditions and the various state by the comparison between the measured degree of saturation and the predicted degree of saturation.

불포화토의 투수특성

송창섭,신창섭,Song, Chang-Seob,Shin, Chang-Seob 한국농공학회 2005 한국농공학회논문집 Vol.47 No.4

In order to analyse the flow problems for an unsaturated soil, it is required to examine closely the characteristics of the coefficient of permeability which is changing with the matric suction. To this ends, a permeability test was conducted on the three samples;granular soil, cohesive soil and silty soil. The specimen was made by pressing the static pressure on the mold filled with soil and the void ratio was controled with the different compaction ratio. And the test was performed by using the modified apparatus of the steady state method which was proposed by flute (1972). The range of matric suction was 0-90 kPa. The measured results for the coefficients of permeability were analysed with the void ratio and the compaction ratio, and it was examined closely the characteristics of the permeability for an unsaturated soil.

보강 혼합토의 역학적 특성(II) -섬유 혼합토-

송창섭,임성윤,Song, Chang Seob,Lim, Seong Yoon 한국환경복원기술학회 2002 한국환경복원기술학회지 Vol.5 No.6

This study has been performed to investigate the physical and mechanical characteristics of compaction, volume change and compressive strength for reinforced soil mixed with polypropylene fiber, and to confirm the reinforcing effects with admixture such as polypropylene fiber. To this end, a series of compaction test and compression test was conducted for clayey soil(CL) and polypropylene fiber reinforced soil. In order to determine proper moisture contents and mixing ratio, pilot test was carried out for natural soil and PFRS(polypropylene fiber reinforced soil). And the mixing ratio of mono-filament fiber and fibrillated polypropylene fiber admixture was 0.1%, 0.3%, 0.5% and 1.0% by the weight of dry soil. From the experimental results, it was found that the optimum moisture contents(OMC) increased with the mixing ratio of fiber, but the maximum dry unit weight and the volume change was decreased with the mixing ratio. It means that the improvement of the workability and the reduction of the weight of embankment was done by the addition of the polypropylene fiber. And, from the compression test results, it was found that the addition of the polypropylene fiber remarkably improved the compressive strength of PFRS. And it was observed in the viewpoint of strength that the fibrillated polypropylene fiber reinforced soil was more effective than the mono-filament polypropylene fiber reinforced soil.

일축압축강도에 의한 선행압밀응력 예측 및 분석

송창섭,김명환,Song, Chang Seob,Kim, Myeong Hwan 한국농공학회 2016 한국농공학회논문집 Vol.58 No.6

This study was to evaluate the feasibility of pre-consolidation pressure distribution characteristic of western and southern coastal region, using correlation of unconfined compressive strength and preceding research equation. Pre-consolidation of western and southern region showed similar trends undrained shear strength and pre-consolidation pressure in proportion to unconfined compressive strength. Predicted results of U.S. NAVY. (1982) equation revealed a small error western 9.7 % and southern 0.4 %. Prediction correlation results of pre-consolidation using unconfined compressive strength revealed an error western 16.8 % and southern 0.7 %. It was reported that less than 20 percent of pre-consolidation pressure prediction result of Casagrande forecasting error. Estimates of pre-consolidation pressure are possible, before the standard consolidation test, because it was reported that less than 20 % of the forecasting errors of Casagrande.

노상토 및 보조기층 재료의 변형특성

송창섭,임성윤,Song, Chang-Seop,Lim, Seong-Yoon 한국농공학회 2010 한국농공학회논문집 Vol.52 No.3

It is very important to select carefully backfill materials and build for the structural integrity of abutment in bridge. In general, backfill materials of unbound crushed stones (SB-1) are used to provide the safety of abutment structure and to reduce differential settlement around abutment that is significantly related with performance of road pavement under working conditions. In this study, to evaluate the compatibility of backfill materials at abutment and to develop the abutment design program, i) basic properties of subgrade soils in Korea, ii) evaluation of deformational characteristics of backfill materials from RC/TS tests, cyclic TX tests and Creep tests were accomplished.

섬유 보강토의 균열 특성 연구

송창섭 ( Song Chang Seob ),이신호 ( Rhee Shin Ho ),반창현 ( Ban Chang Hyun ),인현식 ( In Hyun Sik ) 한국농공학회 1998 한국농공학회 학술대회초록집 Vol.1998 No.-

This study was performed to ascertain the three-dimensional effect of the crack reduction and the restrained effect of crack growth, and to yield a suitable mixing ratio of the synthetic fiber reinforced soil. The results of the study are as follows ; 1) The synthetic fiber has the resisting force for crack because of the adhesion due to the attraction of soil particles. 2) As the synthetic fiber length and the mixing ratio are increased, mono filament synthetic fiber reinforced soil is increased the effects of crack reduction and the restraint of crack growth. 3) The fibrillated synthetic fiber is more effective than mono filament synthetic fiber for crack. 4) A suitable mixing ratio of synthetic fiber reinforced soil is 0.5% of the fibrillated synthetic fiber.

SB-2의 입도변화와 투수에 따른 동상특성

송창섭 ( Changseob Song ),채창우 ( Changwoo Che ),이준헌 ( Junhun Lee ),이명구 ( Munggu Lee ),장웅희 ( Woonghee Jang ),문세훈 ( Sehun Mun ),임성윤 ( Sungyun Iim ) 한국농공학회 2010 한국농공학회 학술대회초록집 Vol.2010 No.-

보조기층으로 사용되는 SB-2를 조골재와 세골재로 분류한 후, 조골재와 세골재의 비율에 따라 재료의 역학적 성질, 투수계수 및 동상율을 측정하여 골재 입도 변화 및 투수특성이 동상에 미치는 영향을 분석하였다. 또한 동상방지층의 골재 입도 기준 수립을 위한 동상특성을 규명하였다. 본 연구의 결과는 다음과 같다. 1. 배합비율이 투수특성에 미치는 영향을 실내시험을 통해 분석한 결과, 투수계수는 20%에서 25%, 30%에서 35%의 범위에서 가장 크게 감소하는 것으로 나타났다. 배합비율에 따른 투수계수의 결정계수는 0.948로 나타났다. 비율에 따른 투수계수의 예측방정식은 높은 결정계수 값을 나타내고 있는 것으로 판단된다. 2. 온도별 동상율을 실내시험을 통해 분석한 결과 0℃에서 -5℃사이에서 대부분의 동상율이 상승하였고, -5℃에서 -15℃까지는 약간의 상승하였으며, -15℃에서 -23℃에서는 동상율의 변화가 일어나지 않았다. 배합비율에 따른 동상율의 결정계수는 0.951로 나타났다. 3. 세골재의 비율이 증가할수록 동상율은 증가하는 것으로 나타났고, 투수계수가 감소될수록 동상율은 증가하는 것으로 나타났다. 세골재의 배합비율이 투수계수와 동상율에 영향을 주는 것으로 사료된다. 4. 쇄석골재의 동상방지층 재료로서의 사용가능성을 검토하기 위한 전단계로 골재의 입도에 따른 동상특성을 규명 하였다. 이를 바탕으로 골재의 입도 기준에 따른 동상방지층 재료의 사용기준 등에 활용될 수 있을 것으로 사료 된다.