• 한국ITS학회 논문지
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• 제21권1호
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• pp.123-140
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• 2022

지하도로의 운전자 주행행태는 지상도로와는 다르기 때문에 이를 반영한 도로설계가 필요하지만, 국내 도시지역 지하도로 설계지침은 대부분 지상도로의 설계기준을 준용하여 설계방법을 설명하고 있다. 본 연구에서는 주행 시뮬레이터를 활용하여 도심 지하도로 유출연결로 접속부의 운전자 주행행태를 분석하였다. 지하도로 및 지상도로 환경이 대조될 수 있는 시나리오를 설정하여 가상주행실험을 수행하였고, 세부 구간별로 주행행태 데이터의 비교·분석과 통계적 유의성을 검토하였다. 그 결과, 지하도로에서의 주행속도는 상대적으로 낮고 차로 횡적 이격거리는 인접한 터널 벽체로부터 멀어지려는 행태를 보였다. 이러한 결과를 바탕으로 지하도로 유출연결로 접속부에서 운전자의 주행안전성을 향상시킬 수 있는 설계방향과 시사점을 제시하였다.

• 자원환경지질
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• 제57권1호
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• pp.17-23
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• 2024

Ground penetrating radar (GPR) survey is a geophysical method that utilizes electromagnetic waves reflecting from a boundary where the electromagnetic property changes. As the frequency of the antenna is about 25 MHz ~ 1 GHz, it is effective to acquire high resolution images of underground pipe, artificial structure, underground cavity, and underground structure. In this study, we analyzed the change of signals reflected from the same underground objects according to the arrangement of transceiver antennas used in ground penetrating radar survey. The antenna used in the experiment was 200 MHz, and the survey was performed in the vertical direction across the sewer and the parallel direction along the sewer to the sewer buried under the road, respectively. A total of five antenna array methods were applied to the survey. The most used arrangement is when the transmitting and receiving antennas are all perpendicular to the survey line (PR-BD). The PR-BD arrangement is effective when the object underground is a horizontal reflector with an angle of less than 30°, such as the sewer under investigation. In this case study, it was confirmed that the transmitter and receiver antennas perpendicular to the survey line (PR-BD) are the most effective way to show the underground structure. In addition, in the case where the transmitting and receiving antennas are orthogonal to each other (XPOL), no specific reflected wave was observed in both experiments measured across or parallel to the sewer. Therefore, in the case of detecting undiscovered objects in the underground, the PR-BD array method in which the transmitting and receiving antennas are aligned in the direction perpendicular to the survey line taken as a reference and the XPOL method in which the transmitting and receiving antennas are orthogonal to each other are all used, it can be effective to apply both of the above arrangements after setting the direction to 45° and 135°.

• 한국환경농학회지
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• 제31권1호
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• pp.9-15
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• 2012

본 연구는 제주지역에서 온실 내 냉난방 및 $CO_2$ 공급 목적으로 지하공기를 이용하는 14개 농업 시설을 대상으로 약 3개월 동안 지하공기 이용 온실과 미이용 공간 내 라돈 농도 및 지하공기 이용 시설의 가동에 따른 지하공기 유입구 내 라돈 농도 분포를 조사하였다. 장기간 라돈 농도는 수동형 알파 입자비적 검출기(Raduet, Radosys Ltd., Hungary)로, 실시간 라돈 농도는 능동형 연속측정 검출기(RAD7, Durridge Co., USA)를 이용하여 측정하였다. 지하공기 이용 온실 내 라돈 농도는 지하공기 미이용 공간과 국내 가옥의 실내 평균값보다 높은 범위였으며, 대부분 농업 시설에서는 국제방사선 방호위원회에서 권고한 근무지에서의 참조준위 1,000 Bq/$m^3$ 보다 낮은 반면 한 개 지점에서는 높은 결과를 보였다. 장기간 및 실시간 지하공기 이용 시설의 가동에 따른 유입구의 라돈 농도 분포는 각각 1,228~5,259 및 3,322~17,900 Bq/$m^3$ 범위로 지역적인 차이를 보였다. 본 연구 결과, 지하공기 중 라돈 농도는 농업 시설이 위치한 지역의 지질 특성 및 시추공 깊이와 밀접한 관계가 있을 것으로 판단된다.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2007년도 추계학술대회 논문집
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• pp.327-331
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• 2007

Inundation of substation and underground power equipment(pad-mounted transformers & switches) breaks out every summer season in low-lying downtown and low-lying shore by localized heavy rain, typhoon and tidal wave. In case inundation of substation and underground power equipment, it occurs a great economic loss owing to recovery time and events of electric shock occur by inundation electrical facility. So we search the damage situation and installation situations. Therefore we propose the necessity of protection of flood at low-lying downtown and low-tying shore. This paper will be used to present a reform proposal of electrical related law about flood protection of existing power equipment.

• 한국복합재료학회:학술대회논문집
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• 한국복합재료학회 2001년도 추계학술발표대회 논문집
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• pp.43-48
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• 2001

To overcome the disadvantages of conventional excavation technology, various trenchless (or excavation free, or no-dig) repair-reinforcement technologies have been developed and tried. But trenchless technologies so fat developed have some brawbacks such as high cost and inconvenience of operation. In this study, a repairing-reinforcing process for underground pipes with glass fiber fabric polymer composites using VARTM(Vacuum Assisted Resin Transfer Molding) has been developed. The developed process requires shorter operation time and lower cost with smaller and simpler operating equipments than those of the conventional trenchless technologies. For the reliable operation of the developed method, a simple method to apply pressure and vacuum to the reinforcement was devised and flexible mold technology was tried. Also, resin filling and cure status during RTM process were monitored with a commercial dielectrometry cure monitoring system, LACOMCURE. From the investigation, it has been found that the developed repairing-reinforcing technology with appropriate process variables and on-line cure monitoring has many advantages over conventional methods.

• 한국초전도저온공학회:학술대회논문집
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• 한국초전도저온공학회 2001년도 학술대회 논문집
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• pp.108-111
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• 2001

This paper presents the possible application of a HTS superconducting power cable for transmitting electric power in metropolitan areas, reflecting its important distinction such as compactness for installation in underground ducts and considerably economical efficiency comparable to present underground cables. In this paper, we investigated characteristic and market scale compact HTS transmission cable which is possible to install in underground ducts. And reviewed its economical efficiency comparing to present existed CV cable from point of view such as cost for cable construction and duct or tunnel installation.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2002년도 가을 학술발표회 논문집
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• pp.29-50
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• 2002

Based on the investigation results on the damages of some underground structures due to the severe Kobe Earthquake it concludes that the aseismicity of underground is far superior to that of aboveground structures. Therefore, at first, necessity to reconstruct strong cities especially by good use of underground space will be discussed. Then two non-circular shield-tunneling projects in Japan are discussed. The first is construction of the world's first shield driven double track subway tunnel of rectangular shape for the Kyoto Municipal Subway. This paper presents a report on the overall planning, the tests that were performed in the process of planning, and the results of driving. The second is the design of the Hirakata Tunnel, with three traffic lanes and shoulders on one side, which will be constructed as one of the tunnels for The New Meishin (Nagoya-Kobe) Expressways. This paper presents the feasibility study of the shield tunneling method, using the same design criteria as the non-circular, horseshoe section of mountain tunnel, to the equivalent section of the Hirakata Tunnel.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2017년도 추계 학술논문 발표대회
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• pp.41-42
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• 2017

In this study, an investigation was made to study the chemical resistance performance of epoxy resin injection type leakage repair material used in the Korean construction market in accordance to the test method outlined in "ISO TS 16774, Part 2; Test Method for Chemical Resistance." This is a new standard document used for quality control method of injection type repair material used for leakage cracking of underground concrete structures. The results of this study can be expected to be utilized as reference data that can be used for quality improvement of the maintenance methods for future construction.

• 한국물환경학회지
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• 제21권1호
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• pp.52-58
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• 2005

The assessment on characteristics of hydraulic behavior and water quality variations of underground reservoirs of buildings were studied. Firstly, it was thought that underground reservoir capacities($m^3$) of buildings should be not determinated by the uniform and same methods but be estimated on the basis of the dwelling areas on dominated households and their residential characteristics, because these characteristics influence significantly on actual water usages and patterns of buildings. Secondly, it was likely that the average reduction rate of residual chlorine in underground reservoirs were affected from the their capacities, because the average reduction rate of residual chlorine in underground reservoirs under $1,000m^3$ was 43 percent, on the other hand, that rate of underground reservoirs over $1,000m^3$ was 60 percent. Thirdly, through the field investigation, the retention time of drinking water in underground reservoirs were in the range from 0.3 day to 3.9 day. In addition to, the average reduction rate of residual chlorine were depended largely on the retention time of drinking water. When the retention time was under 24 hours, the average reduction rate of residual chlorine was 45 percent, and in case of over 24 hours, was 49 percent. Fourth, water level in underground reservoirs was averagely varied in the range from 0.1 m to 2.65 m at the height of underground reservoirs. If considered actual height of underground reservoirs, 37.6 percent of the height of underground reservoirs was only used. Consequently, the frequency of the inflow and outflow of drinking water in underground reservoir were very increased, and had an effect on the reduction of residual chlorine. Lastly, the investigations on hydraulic structure characteristics of underground reservoirs inside showed the locations of inflow and outflow of drinking water almost were in the opposite direction. And some buildings had several baffles in the middle. Nevertheless, their installations had no beneficial for the improvement of water quality.

• 터널과지하공간
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• 제10권4호
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• pp.506-515
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• 2000

최근 30년간 경제적, 사회적 및 군사적인 목적으로 국내에 많은 지하구조물의 건설이 수행되었다. 그 결과 지질조사, 실험실 및 현장시험, 계측 등을 통하여 많은 양의 자료가 얻어졌으나 지금가지 이 귀중한 자료들은 체계적으로 축적되지 못하였고 활용되지도 못하였다. 이는 막대한 돈과 시간의 낭비라 할 수 있다. 본 연구에서는 Microsoft Access 97을 개발 도구로 하여 지하 구조물의 건설중에 얻어진 자료를 효과적으로 저장 및 운용할 수 있는 데이터베이스인 GeoINFO를 개발하였다. GeoINFO는 주요 지반 구조물인 터널, 지하저장시설 및 사면의 구축 시 얻어진 자료의 저장 및 운용에 유용하도록 구성되어 있으며 자료 입력을 위해서는 다층의 트리 (tree)군조를, 자료의 검색을 위해서는 Visual Basic을 활용한 고유의 검색 시스템을 갖추고 있다.