• 한국지반신소재학회논문집
• /
• 제4권3호
• /
• pp.3-10
• /
• 2005

본 연구는 연직 배수재의 통수능력 저감 요인인 측방토압, 동수경사, 배수재의 변형에 의한 통수능력의 저감을 밝히기 위하여 현장조건에 가장 부합되는 고무 멤부레인 안에 하모니카형, 성곽형, 파이버형 드레인을 설치한 후 드레인 주변에 슬러리 상태의 점토를 넣고 통수능 특성에 관한 실험을 실시하였다. 그 결과 배수재의 종류에 따른 통수능력은 하모니카형, 성곽형, 파이버형 순으로 통수능력이 컸으며, 또한 측압 보다 동수경사에 대한 통수능력 감소가 높게 나타났다.

• 한국지반공학회논문집
• /
• 제18권1호
• /
• pp.59-70
• /
• 2002

연직배수공법에서 과잉간극수를 배제하기 위해 연직배수재와함께 수평배수층이 지반 위에 설치된다. 이 논문에서는 수평배수층의 통수능을 고려한 압밀해석 방법을 개발하고 수평배수층의 소요통수능을 결정하는 공식을 제안하였다. 이 해석으로부터 성토하중의 재하속도의 영향은 매우 적다는 것을 알게 되었다. 이 공식에서는 압밀계수, 연직배수재의 타설간격, 수평배수층의 배수거리, 압축지수 및 압밀침하 대상층의 두께의 함수로 소요통수능의 결정이 가능하다.

• 한국환경복원기술학회지
• /
• 제9권1호
• /
• pp.1-13
• /
• 2006

The recent environmental protection issue has diminished the supply of sand for soft ground improvements so much that the prices of sand have shown a sudden rise. Plastic material is one of substitutes for sand material, but plastic is nonperishable and doubtable if it has potential environmental hormone disrupting substances. Moderate-priced natural fiber drain board made with coconut coir and jute filter are in the spotlight recently as an alternative material for sand and plastic drain board etc. Natural fiber drain has not only competitive price but also a characteristic of assimilation into the soils after finishing of its own function. Discharge capacity of the fiber drain board evaluated by triaxial type discharge capacity test was relatively lower than that of plastic drain board. Nevertheless, settlement and pore pressure dissipation behaviors of the fiber drain board and the plastic drain board which were installed in the clayey soil during the composite discharge capacity test were almost similar. It was also found that biodegradation of the fiber drain board was in progress until 18 month after installation in the clayey soil, but they had still enough engineering properties to use at field.

• 한국지반공학회:학술대회논문집
• /
• 한국지반공학회 2008년도 춘계 학술발표회 초청강연 및 논문집
• /
• pp.293-299
• /
• 2008

If a conventional type of Plastic Board Drain (PBD) is installed to the deep clay deposit, it is subjected to a high lateral earth pressure. a flow channel of PBD may be reduced by the collapse of cores and clogged by the intrusion of filter into the space between cores which are made by lateral pressure. It could decrease the ability of initial discharge capacity and the reliability of long term discharge capacity. A cylindrical plastic board drain (C-PBD) considered in this study consists of cylindrical core and several supports so that it can prevent the reduction of area of flow channel from the higher lateral earth pressure effectively. The discharge capacity of C-PBD was compared to that of a conventional PBD through performing experiments using the composite discharge capacity apparatus which can consider in-situ condition such as penetration of drains, ground settlement and discharge capacity. As a result, C-PBD showed much better performance than PBD in the ability of discharge. It was observed that the C-PBD was folded whereas the conventional PBD was folded after the experiment.

• 한국지반신소재학회논문집
• /
• 제9권2호
• /
• pp.11-20
• /
• 2010

본 연구에서는 국내에서 사용하고 있는 연직배수재의 통수능시험 평가방법과 국내 관련 시방기준들을 고찰하고 연직배수재통수능 시험시 결과에 영향을 미치는 인자로 동수경사 변화에 따른연직배수재의 통수능 시험 결과를 분석하였다. 국내 연직배수재의 통수능 평가시험방법으로 기존 Delft 방법에 근거한 KS K 0940(2008)이 최근 한국표준으로 등재되었으며, 이 시험방법을 사용하는 경우 동수경사의 변화에 따라 연직배수재의 통수능의 차이가 크게 나타날 가능성이 있는 것으로 확인되었다.

• 한국지반공학회:학술대회논문집
• /
• 한국지반공학회 2002년도 봄 학술발표회 논문집
• /
• pp.557-564
• /
• 2002

Discharge capacity test is carried out to find out influencing factors on discharge capacity of prefabricated horizontal drains to improve weak dredged clay. Four representative prefabricated horizontal drains are selected based on the size of drain as well as the shape of core. Test is carried out for 10 days at each three level of confining pressure for all drains. Effects of elapsed time, confining pressure, hydraulic gradient and strength of filter and core on discharge capacities are examined. It is found that discharge capacity of drain, which has deformable core or has a possibility of squeezing filter into core, decreases more with time due to its low strength. As confining pressure increases, discharge capacity decreases due to the squeezing of filter into core.

• 한국지반신소재학회논문집
• /
• 제9권3호
• /
• pp.67-75
• /
• 2010

본 연구에서는 생분해성 수지를 이용한 연직배수재에 대해 다양한 성능 평가방법을 적용하여 생분해성 플라스틱배수재의 공학적 특성을 분석하였다. 생분해성 플라스틱으로 제작한 연직배수재는 기존 합성수지 연직배수재에 비해 낮은 인장변형률을 가지며 상대적으로 낮은 인장강도를 갖지만, 연직배수재로서 가져야 할 최소한의 인장강도는 발휘하는 것으로 나타났다. 생분해성 플라스틱으로 제작한 필터는 투수성이 좋고 유효구멍크기가 작아 필터의 성능으로 매우 적합한 것으로 나타났다. 또한 생분해성플라스틱 배수재의 통수능은 필터의 강성을 개선하는 경우 국내 시방기준에도 만족할 수 있는 성능을 갖는 것으로 나타났다.

• 한국지반공학회:학술대회논문집
• /
• 한국지반공학회 2001년도 봄 학술발표회 논문집
• /
• pp.563-570
• /
• 2001

In this study, the charactersistics of horizontal drains used to stabilize the dredged fill are investigated experimentally by doing tensile strength test, discharge capacity test, and filter clogging test. The types of the drains selected for the study are filament type (Tyre-E), embossed type(Type-P) and heat bonded cubic type with the thickness 10mm(Type-010) and 5mm(Type-05). The results of tensile strength and discharge capacity test show that the performance of drain Type-O10 was better than the other drains. This is caused by the fact that the lattice shape core of drain Type-O10 has strong rigidity and minimizes the loss of the sectional area of discharge with increased confining pressure. Analyzing the compatibility of filters by the results of the strength characteristics test and clogging test, the filter of filament type drain produced with polyester clothed polyamide performed well.

• 전기학회논문지
• /
• 제61권3호
• /
• pp.413-421
• /
• 2012

This paper proposes the design and implementation of fluid flow generation system by using polypropylene(PP) water capture, which harvests electric energy from the kinetic energy of tidal current or water flow and drives the desired load, and applies it to the discharge drain of Hadong thermal power plant. This experimental system is composed of water captures, driving wheel, gear trains, 10[kW] synchronous generator, and three phase rectifying circuit which drives lamp load for test. The proposed water capturing system which is composed of water captures, rope and driving wheel, rotates as caterpillar according to water flow. This system is very easy to manufacture and more economical than another type of tidal current turbines such as conventional propeller and helical type. Also, we estimated the available fluid flow energy that can be extracted from the cooling water in discharge drain based on drain's cross-sectional area. Therefore, this paper confirms the validity of proposed fluid flow generation system with water captures and the possibility of its application for renewable energy generation in discharge drain of thermal power plant, from the obtained performance characteristic of this energy conversion system.

• 한국농공학회지
• /
• 제39권2호
• /
• pp.134-142
• /
• 1997

This study was performed to evaluate the drain runoff characteristics from one paddy field, and to provide the basic data required for the determination of flood discharge and unit drainage water for drainage improvement and farmland consolidation. For this purpose, under the assumption that drain discharge from paddy field was similar to outflow of reservoir, runoff model based on storage equation was applied to the experimental field, and simulated results were compared to the measured discharge at weir point. To estimate effective storage volume of paddy field with water depth, 4 regression formula were examined such as linear, exponential, power, and combined. From the observed runoff characteristics, it was shown to be 3.3~16.3${\ell}$/sec in weir discharge, 57.2~98% in runoff ratio, and relative error of simulated result was 3.0~39.4%, 8.5 ~56.0 % for peak flow and runoff ratio, respectively. Curve number by SCS method was calculated as mean value of 96.4 using measured rainfall and runoff data, it was considered relatively high because paddy field has generally flooding depth contrary to the upland watershed area.