• 한국터널지하공간학회 논문집
• /
• 제8권1호
• /
• pp.13-20
• /
• 2006

본 연구에서는 터널구조물 장대화로 인한 기존 배수시스템의 시공상의 어려움과 기능 저하문제 동을 해결하기위하여 바닥배수판을 이용한 새로운 터널배수시스템을 제안하고 성능평가를 위한 기초연구를 수행하였다. 제안된 배수시스템은 기존의 측방향 배수관, 횡방향 배수관 및 유공관 등이 생략 가능한 배수시스템이다. 그러나 바닥배수판의 형상 등을 고려한 통수능분석 및 설계기준 등이 정립되어 있지 않다. 따라서, 본 연구에서는 수리모형 실험을 통하여 바닥배수판의 돌기부 형상 및 위치와 유량조건별 통수능의 상관관계를 분석하였다. 바닥배수판 돌기부의 형상 및 유수방향 간격은 흐름에 대한 저항성 차이로 언하여 통수능에 큰 영향을 미치며, 앞뒤둥근형 돌기부 형상이 가장 통수능 확보에 유리한 것으로 나타났다. 또한 돌기부의 유수방향 간격이 좁을수록 바닥배수판의 통수능을 향상시킬 수 있다.

• 물과 미래
• /
• 제9권2호
• /
• pp.67-75
• /
• 1976

With 9 existng reservoirs selected in the Sab-Gyo River Basin, the sedimentation of the reservoirs has been calculated by comparing the present capacity with the original value, which revealed its reduced reservoirs capacity. The reservoirs has a total drainage area of 6,792 ha, with a total capacity of 1,204.09 ha-m, and are short of water supply due to reduction of reservoirs capacity. Annual sedimention in the reservcire is relation to the drainage area, the mean of annual rain fall, and the slop of drainage area. The results of obtained from the investigation are summarized as follow; (1) A sediment deposition rate is very high, being about $9.19{m}^3/ha$ of drainage area, and resulting in the average decrease of reservoir capacity by 19.1%. This high rate of deposition could be mainly attributed to the serve denvdation of forests due to disor derly cuttings of tree. (2) An average unit storage of 415.8mm as the time of initial construation is decreesed to 315.59mm at present, as resultting, we could'nt supply water at 566.24ha. (3) A sediment deposition rate as a relation to the capacity of unit drainage area is as follow; $Qs=1.43 (c/a)^{0.531}$ (4) A sediment deposition rate as a relation to the mean of annval rainfall is as follow; $Qs=672.61 p^{0.024}$ (5) A sediment deposition rate as a relation to the mean slop of drainage area is follow; $Qs=267.21 S^{0.597}$

• 한국농공학회지
• /
• 제17권3호
• /
• pp.3840-3847
• /
• 1975

With 30 excisting reservoirs in the Chin-Young area, the Sedimentation of the reservoirs has been calculated by comparing the present capacity with the original value, which revealed its reduced reservoir capacity. The reservoirs has a total drainage area of 3l4l ha, with a total capacity of 43.23 ha-m, and are short of water supply due to reduction of reservoir capacity, Annual sedimentation in the reservoir is relation to the drainage area, the mean of annual rainfall, and the slop of drainage area. The results of obtained from the investigation are summarized as follows: (1) A Sediment deposition rate is high, being about 7.03㎥/ha of drainage area, and resulting in the overage decrease of reservoir capacity by 16.1%. This high rate of deposition coule be mainly attributed to the serve denudation of forests due to disorderly cuttings of tree. (2) An average unit storageof 116mm as the time of initial construction is decreased to 95.6mm at present. This phenomena cause a greater storage of irrigation water, sinceit was assumed that original storage quantity itself was already in short. (3) A sediment deposition rate as a relation to the capacity of unit drainge area is as follow: Qs=1.27(C/A)0.6 and standard deviation is 185.5㎥/$\textrm{km}^2$/year. (4) A sediment deposition rate as a relation to the mean of annual rainfall is as follow: Qs=21.9p10.5 and the standard deviation is 364.8㎥/$\textrm{km}^2$/year. (5) A sediment deposition rate as a relation to the mean slop of drainage area is follow: Qs=39.6S0.75 and the standard deviation is 190.2㎥/$\textrm{km}^2$/year (6) Asediment deposition rate as a relation to the drainage area, mean of rainfall, mean of slope of drainage area is: Log Qs=0.197+0.108LogA-6.72LogP+2.20LogS and the standard deviation is 92.4㎥/$\textrm{km}^2$/year

• 한국지반공학회논문집
• /
• 제32권5호
• /
• pp.37-48
• /
• 2016

본 연구는 실제 시공 환경에서 투수성 보도블록의 표면 유출 및 배수 특성을 알아보고자 하였으며, 표층 및 노반을 포함한 시편을 대상으로 불포화 상태에서 도심 내 우수 조건을 고려한 배수 실험을 진행하였다. 일정한 시간 간격을 두고 반복적인 배수 실험 및 공극 막힘 실험이 시행되었으며, 정량적 분석을 위하여 3D X-ray CT 이미지 분석 및 증발 실험을 시행하였다. 실험 결과, 시간 간격 동안 발생한 증발로 인해 공극 내 물이 공간적으로 재분포되어 표면 유출을 야기시키는 것으로 나타났다. 특히, 공기에 노출되어 있는 표층보다 시편 하부에 위치한 노반의 공극 변화가 투수성 보도블록의 배수, 증발 등 전체적인 수리학적 거동을 크게 저하시켰다. 또한 공극 내 침전물은 증발로 인한 변화를 증진 시키며, 이 때 저하된 배수 성능은 쉽게 회복되지 않는 것으로 나타났다. 그리고 선행우수조건에 의하여 배수 성능이 저감되면서 최대 표면 유출 높이가 증가하는 것으로 나타났다.

• 한국지반공학회:학술대회논문집
• /
• 한국지반공학회 2006년도 춘계 학술발표회 논문집
• /
• pp.311-315
• /
• 2006

Various core shapes of cylindrical drains are used for accelerating primary consolidation for soft clay deposits, but serious harmful disadvantages on drainage capacity may occur on cylindrical drains due to confining Pressure when they are installed in that soil. In this study, two different core shapes of cylindrical drain are used to evaluate the drainage capacity with consideration of clogging effects on their filter jackets for an applied confining pressure. Column tests with radial drainage system were conducted under confining pressure of 50 kPa for 13 days. Two parameters which are discharge and accumulated volume of water drained were measured as the time elapsing. From this experimental study, the results showed that at the Initial stage before the clogging developed enough, the cylindrical drain with angular-type-plastic-core could produce discharge twice higher (maximum) than those with round-type. After 13 days had passed on, cylindrical drain with angular-type-plastic-core could produce discharge only 20% higher than those with round-type one. Eventually, there is a possibility that the efficiency of using angular-type-cylindrical-drain will be similar to the round-type one as the clogging develops more.

• 한국농공학회지
• /
• 제11권4호
• /
• pp.1803-1809
• /
• 1969

The newly designed mole drainage plower which is attached to tractor is tested for work capacity comparing with the pulling by man animal and winch. Besides. the effect of desalinization by the mole drainage in reclaimed tideland was observed. The results as obtained in this experiment are as follows: 1. The mole drainage plower of tractor attachment has higher work capacity by 3 to 5 times than that of winch 2. The suitable soil moisture content to carry out the layout of mole drains is from 21 to 25 percent. 3. The new design mole drainage plower requires th lowest cost as comparing with the other methods. 4. Carrying out the mole drainage in reclaimed tideland it is effective in desalinization from 2 to 3 times than the only use of irrigation water. 5. The reasonable depth and interval of mole drains may be 60cm and 3m respectively. 6. The desalinization by the mole drainage increases the yield of rice from 40 to 45 percent in reclaimed tideland.

• 한국농공학회지
• /
• 제45권6호
• /
• pp.136-143
• /
• 2003

This study is performed to evaluate performance of the developed pipe when using for underground drainage in fm land, the efficiency of the pipe is examined such as quantity of drainage, water temperature and other field performance in all weather condition. Results of this study, the higher permeability through wall of the pipe is achieved by making various size pores using open-graded aggregate. And in all weather conditions, permeable polymer concrete pipe perform much better than conventional perforated pipes. During rice farming period, quantity of drainage the permeable polymer concrete pipe is 1.25 time greater than conventional perforated pipes. Therefore, use of the permeable polymer concrete pipe is greater advantages when considering collecting and draining capacity compared with conventional perforated pipes.

• 한국지반공학회:학술대회논문집
• /
• 한국지반공학회 2005년도 춘계 학술발표회 논문집
• /
• pp.1369-1376
• /
• 2005

In case of the drainage type tunnel, the residual water pressure is likely to act on the tunnel lining due to the decrease of water-passing capacity of the filter material. Therefore, this study discussions a method to predict the lining load with the consideration of water passing capacity of the filter material through the literature review and numerical analysis. It is expected from the results of case studies that the design load acting on the concrete lining in the drainage type tunnel could be assumed to be about 50% of the hydrostatic water pressure in steady-state ground-water condition.

• 한국지반공학회지:지반
• /
• 제13권2호
• /
• pp.39-54
• /
• 1997

연약지반 개량공법으로 국내에서 생산된 플라스틱 보드 드레인(PBD)이 많이 사용되고 있으나 이들에 대한 물리적 성질 및 배수성능의 검증이 미약한 실정이다. 또한 PBD의 웰 레지스턴스(well resistance)에 크게 영향을 미치는 공기(기포)의 영향에 대한 인식이 부족하다고 판단된다. 따라서 본 연구에서는 대형 실험장치를 이용하여 먼저 국산 PBD를 중심으로 물리적 성질 및 배수성능 시험을 실시하여 제품의 질적 수준을 규명하고 대표적인 국외제품과 비교했다. 아울러 PBD재의 꺾임 부분에 누적된 공기(기포)가 통수능력에 지장을 초래하는 것을 재확인하였으며 현장에서 적용할 수 있는 진공펌프를 이용하여 필기(기포)를 제거시키므로써 통수능력의 회복이 가능하다는 것을 나타냈다.

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 1999년도 추계학술대회 논문집
• /
• pp.407-414
• /
• 1999

Sand drain as a vertical drainage is widely used in soft ground improvement. Recently, sand, the principal source of sand drain, is running out. A laboratory model test was carried out to utilize gravel as a substitute for sand. Though which the characteristics of gravel are compared to those of sand for engineering purpose. According to the test, the settlement was found to be smaller in gravel drain than in sand drain. The increase in bearing capacity by gravel rile explains the result. The clogging effect was not found in gravel column. As a result, it is assumed that gravel is relatively acceptable as a drainage material. Gravel material seems better than sand material in bearing capacity and it is found that bearing capacity is larger when gravel is used as compaction pile than as drain from in-situ test on bearing capacity. Increase of bearing capacity with gravel pile means an effect of composite ground by stiffness of gravel material. It can lie supposed to use gravel pile instead of sand pile in view of consolidation effect and bearing capacity.