• 지질공학
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• 제27권3호
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• pp.255-265
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• 2017

상주시 임곡리에 굴착된 심도 100 m 지하수공(PW-2)의 적정양수량을 산정하였다. 시추코아와, 물리검층 자료에 의하면 지하수 산출 심도는 26.1~26.5, 28.0~30.0, 33, 58, 71 m로 해석된다. 단계양수시험에 의하면 40, 55, 70, 90, $132m^3/d$의 양수량으로 70일간 양수시 수위강하량은 각각 6.48, 11.56, 18.07, 28.99, 60.26 m로 예상되었다. $117m^3/d$으로 250분간 실시한 일정량양수시험에서는 양수 경과시간 120~150분에 영향추가 불투수층 경계조건에 도달하여 급격한 수위강하가 일어나 PW-2의 한계채수량은 $90m^3/d$로 산정하였으며 이때의 수위강하량은 28.82~31.27 m이다. 적정양수량은 한계채수량의 범위내의 정류상태여야 하기 때문에 PW-2의 적정양수량은 $70{\sim}90m^3/d$로 제시하였다. 불투수층 경계조건에서 직선의 기울기가 급해지며 지하수의 DO와 ORP가 증가하는 것으로 보아 PW-2를 중심으로 한 기반암지하수의 발달은 제한적인 것으로 추정된다.

• 한국건축시공학회지
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• 제13권4호
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• pp.400-406
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• 2013

In high-rise buildings, high-strength concrete is widely used to reduce the section of structure members under axial load. Also, the price increase of materials is very important item in the high-rise buildings. Especially, concrete used high-pressure pump due to consecutive structural assembly. Unlike slump type of ordinary concrete, high strength concrete has different properties of concrete pumping due to viscosity. However, there have been no Korean studies on the pumping properties of high strength concrete. Therefore, this paper measures the friction factor of high strength concrete with changes in the pressure of concrete pumping. We analyzed the trends of the friction factor based on changes in the pressure of concrete pumping, and then calculated the quantity of concrete deposited for each specified concrete strength and location of placement. After comparing these results with the quantity of concrete deposited measured in field, we evaluated the pumping properties of high strength concrete. Through the tests and the review, we attempt to suggest some basic information for the In-Situ application of high strength concrete.

• 한국지하수토양환경학회지:지하수토양환경
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• 제19권3호
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• pp.66-81
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• 2014

A Fortran program was developed to determine the optimal locations of an artificial recharge well. Three objective functions were considered: (1) maximizing the recovery rates, (2) maximizing the injection rates, and (3) minimizing the coefficient of variation of the increased pumping rates. We also suggested a new aggregate objective function which combined the first and the third objective functions. The model results showed that locating the injection well inside the cluster of pumping wells was desirable if either the recovery or the injection rate was taken into account. However, the injection well located outside the cluster evenly increased the pumping rates in existing pumping wells. Therefore, for clustered pumping wells, installing an injection well at the center or the upstream of the pumping wells seems beneficial. For linear arrangement of pumping wells parallel to the constant head boundary, locating the injection well in the upstream was recommended. On the contrary, in case of the linear arrangement perpendicular to the constant head boundary, the injection well installed on both sides of the central part of the pumping wells was preferable.

• 자원환경지질
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• 제54권2호
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• pp.247-257
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• 2021

The study area has been contaminated with explosive materials and heavy metals for several decades. For the design of the pump and treat remediation method, groundwater flow before and during groundwater pumping in a contaminated aquifer system was simulated, calibrated, and predicted using a generalized multidimensional hydrological numerical model. A three-dimensional geologic formation model representing the geology, hydrogeology, and topography of the aquifer system was established. A steady-state numerical simulation with model calibration was performed to obtain initial steady-state spatial distributions of groundwater flow and groundwater table in the aquifer system before groundwater pumping, and its results were illustrated and analyzed. A series of transient-state numerical simulations were then performed during groundwater pumping with the four different pumping rates at a potential location of the pumping well. Its results are illustrated and analyzed to provide primary reference data for the pump and treat remediation method. The results of both steady-state and transient-state numerical simulations show that the spatial distribution and properties of the geologic media and the topography have significant effects on the groundwater flow and thus depression zone.

• 한국방재학회 논문집
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• 제10권5호
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• pp.159-168
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• 2010

해안대수층의 지형특성과 수리특성에 의한 담수-염수 경계면과 최대담수양수량의 변화를 연구하였다. 모래 대수층의 수리전도도와 사면경사, 그리고 염수의 염도조건에 따른 담수-염수 경계면의 기울기 및 염수쐐기의 침투길이를 분석하였으며, 일정한 위치의 양수정에서 최대담수양수량과 염수침투제어를 위한 최적염수양수량을 실내 모래수조 모형을 이용하여 분석하였다. 실험결과, 대수층의 수리전도도가 높을수록, 사면경사가 급할수록 최대담수양수량은 증가되었으며, 이때 염도에 의한 영향은 상대적으로 미미하였다. 또한, 최대담수양수량이 증가함에 따라 염수침투제어를 위한 최적염수양수량이 비례적으로 증가되었으며, 그 양은 최대담수양수량 보다 평균 14% 증가되었다. 양수정의 위치에 따라 최대담수양수량과 최적염수양수량은 변화되었고, 염수위와 담수-염수 경계면에서 가까울수록 양수량은 감소하였다. 이러한 결과는 해안지역에서 지하수 개발량의 최대화를 위한 양수정의 위치 선정시, 대수층의 수리전도도, 사면경사 및 염도가 고려되어야 할 것으로 판단된다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 1999년도 봄 학술발표회 논문집
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• pp.463-470
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• 1999

The railroad transportation system has more advantages over other transportation systems in terms of low cost, safety and mass transportation The development in economy and social environments lead to the increase of the transportation between cities. As a result, the increased capacity of transportation system is required and maintenance of transportation facilities becomes more important, In the railroad system mud-pumping is one of the troubles to cause distortion of rails and progressive disrupture of subgrade. h this study, SASW measurements were performed to investigate stiffness structures at the sites with mud-pumping and without mud-pumping, Comparison of the stiffness structures revealed the mechanism of mud-pumping and provided information to choose measures for the mud-pumping.

• 대한지하수환경학회지
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• 제7권1호
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• pp.20-23
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• 2000

양수시험시 획득되는 회복자료만을 이용하여 저유계수를 추정하는 일반해를 제시하였다. Banton and Bangoy(1996)가 제시한 단 단계(single-step) 양수시험에서 얻는 회복자료를 이용한 저유계수 추정해를 일반적인 다단계 (multi-step)시험 회복자료에도 적용 가능하게 확장한 것이다. 본 연구에서 구한 일반 해를 이용하여 저유계수와 투수계수를 구한 결과 다른 방법으로 구한 결과 값과 잘 일치하였다.

• 진공이야기
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• 제1권1호
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• pp.6-10
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• 2014

It is a common sense that water is an old offender crashing our dream of achieving a good vacuum in an early time. Various techniques for accelerating the removal of water have been developed and utilized. However, we generally are not skilled in treating the water pumping in a physically proper manner. We are rather used to handle the situation of the water pumping just like considering a conventional air pumping. Under such an erroneous approach, we cannot help making an overestimation on the pumping capability of our vacuum system, and it leads to a big mismatch between the real operation timing and the planned process schedule. In this article, some main points concerning with the subject that a vacuum pumping is really a water pumping will be discussed.

• 한국유체기계학회 논문집
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• 제8권5호
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• pp.22-28
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• 2005

As the water supply facilities are recently getting larger, the domestic waterworks become multi-regional water supply system. Large water supply facilities generally consist of the intake pumping station, water treatment plant and water supply/distribution facilities. Although the pumping stations and the pipeline systems are used to pump up water, it often happens pipeline damage and flooding accident by the water hammer. In this paper, the intake pumping station is guaranteed by both the computer simulation and the field test analysis. This study is contributed to the safe operation program for the pumping station in which results of the adjustment on the safety plan of the pumping station, the air valve and the valve closing time.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2002년도 학술대회지
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• pp.577-580
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• 2002

In this paper, the pumping performance of the disk-type drag pump which works in the outlet pressure range from 4 to 0.001 Torr is studied experimentally. The pumping characteristics of various drag pumps are performed. The inlet pressures are measured for various outlet pressures of the test pump. The flow-meter method is adopted to calculate the pumping speed. Compression ratios and pumping speeds for the nitrogen gas are measured. The present experimental data show the leak-limited value of the compression ratio in the molecular transition region. The rotational speed of the pump is 24,000rpm. The inlet pressures are measured for various outlet pressures of the test pump. The ultimate Pressures for zero throughput are measured for three-stage, two-stage and single-stage disk-type, respectively.