• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2005년도 INTERNATIONAL SYMPOSIUM ON SOIL & GROUNDWATER ENVIRONMENT
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• pp.155-157
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• 2005

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2000년도 창립총회 및 춘계학술발표회
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• pp.33-36
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• 2000

The purpose of this study investigated underground oil storage(USTs) and Landfill using the envi-cone penetrometer system. The electrical resistivity sensor, pH sensor, ORP sensor, and thermometer are installed in envi-cone penetrometer system. This envi-cone penetrometer system provides a continuous profile of measurements, and it is rapid, repeatable, reliable and cost effective for investigation of contaminated ground.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2004년도 임시총회 및 추계학술발표회
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• pp.262-265
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• 2004

The purpose of this study is to investigate environmental characteristics and in-situ hydraulic conductivity by eco cone penetration system. The underground environments and permeability of site was investigated and analyzed by this eco cone system. The electrical resistivity, pH, ORP, temperature and hydraulic conductivity were measured by eco cone penetration system. This eco cone penetration system provides a continuous environment and permeability profiles in underground, and provides reliable results for investigation of normal and contaminated ground.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 하계학술대회 논문집 A
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• pp.576-578
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• 2000

This paper address the prediction method of a soil thermal property depending on soil moisture contents and suggests the guideline to determine the soil thermal resistivity for the calculation of the cuurent carrying capacity of underground power cables in Korea.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 E
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• pp.2355-2357
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• 1999

Estimating equivalent soil model which represents an actual soil structure and its electrical characteristics, is extremely improtant for good substation grounding system design and analysis. Since the equivalent soil model is deduced based on the measured apparent soil resistivity - generally obtained from Wenner's 4-point method, reasonable and accurate measuring technique and procedure guarantee good grounding system design and analysis. The paper aims to show the importance of reasonable enough probe spacing by presenting the influence of soil modelling to estimation and measurement of grounding resistance of substation grounding grid.

• 물과 미래
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• 제8권2호
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• pp.30-40
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• 1975

Hydrogeological survey and geophysical prospecting have been carried out in Saudi Arabia for the purpose of finding groundwater in the soil and rock at the request of General trading company in Jeddah, Saudi Arabia. The surveyed area is located on $38^{\circ}-39^{\circ}$ 30' in longitude and $26^{\circ}-26^{\circ}$ 30' in latitude. The topography of this area is dominated by northwest southeast mountain range composed mostly of precambrian rocks and basalt of tertiary period. Geology is mainly composed of greenstone, granite, andesite, diorite rhyolite of pre-cambrian era and sandstone of cambrian period which are underlained by basalt and andesite of tertiary period and alluvium of quaternary unconformably. The instruments used in this investigation are TR-18B2 radioactivity unit which isjapanese patented and A.C. Terrameter, a resistivity meter manufactured by ABEM of Stockholm, Sweden. Radioactivity method has been conducted along the Alula-Khaybar road, totally 164Km by the car-borne. As a result of the above survey 16 places have been selected and these anomalies show 1.2N-1.6N compared to background of each area in intensity with width of 10-50m. Resistivity vertical profiling which made use of Schlumberger configuration method has been made over selected areas by radioactivity method to provide hydrogeological information for a water resources survey. The result of resistivity shows that good aquifers are located in the western part of surveyed area where sedimentary rock is distributed. The strata showing 10-50, ${\Omega}-m$ in resistivity are thought to be waterbearing layer. The variations in aquifer resistivity found, are thought to be due to verying clay content, which could be related to aquifer yield. It has proved impossible to detect small salinity variation in the buried aquifer by geophysics. As a result of resistivity prospecting 10 places are recommended to be drilled at the anomalies as shown attached map. yields from the proposed holes have been estimated approximately from $20m^3$ to $200m^3$ per day. Prior to drilling for groundwater, test boring using ${\c}4"$ should be drilled in order to obtain more reliable hydrogeological information for the construction of perfect wells.ells.

• 자원환경지질
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• 제48권4호
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• pp.351-360
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• 2015

지질학적, 물리탐사기법, 지질공학적 방법을 통하여 함안군 도항리 6호고분의 축조 형태, 고분 축조에 사용된 재료의 원산지와 공학적 성질, 봉분과 석실부에 대한 안정성 등을 고찰하였다. 고분의 기반암인 함안층은 풍화를 받아 인력으로 굴착이 용이한 암반 특성을 나타내었다. 전기비저항 탐사에 의하면 봉분은 토사부를 나타내는 저비저항대와 암석편의 함량이 많은 암석부의 고비저항대로 구분되었다. 대부분의 석실부 개석은 함안층과 동일한 암석으로 구성되어 있으나, 개석의 일부는 연구지역의 최남단에서 산출되는 흑운모화강암과 동일하다. 토질 시험에 의하면, 봉분의 토사부는 낮은 함수비, 낮은 간극비, 적정한 단위중량으로 보아 다짐 정도가 매우 높은 재료임을 지시한다. 또한 봉분의 암석부의 강도는 일반적인 암반의 전단강도를 초과하고 있어 매우 안정성 있게 유지되고 있는 것으로 해석된다.

• 한국지구과학회지
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• 제36권1호
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• pp.16-26
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• 2015

연약지반의 평가를 위한 물리탐사기법의 적용성을 알아보기 위해 총 6개월간의 전기비저항 모니터링자료를 취득하였다. 추가적으로 다중채널 표면파 탐사(Multichannel Analysis Surface Wave; MASW)를 실시하여 전단파 속도와 연약지반의 강도분포를 파악하고자 하였다. 또한, 콘 관입시험(Cone Penetration Test; CPT)과 시추 시료의 실내시험을 이용하여 물리탐사 자료와의 상관성을 확인하고 탐사 자료의 신뢰성을 높이고자 하였다. 그 결과 장기간의 모니터링 자료로부터 연약지반의 거동양상을 파악할 수 있었고, 추가 탐사를 통해 얻은 전단파 속도와 실내 시험간의 유의미한 상관관계가 확인되어 연구 지역 연약지반의 강도를 평가하는데 있어 표면파 탐사의 유용성을 확인 할 수 있었다. 최종적으로 지구통계학적 방법을 이용하여 물리탐사 자료와 이종 자료에 대한 3차원적인 지반 분포 영상을 획득하였다. 본 연구를 통해 넓은 영역에서의 연약지반 평가를 위해서는 장기간의 전기비저항 모니터링으로 영역 전체의 특성을 파악해야 함을 알 수 있었다. 이를 보강할 수 있는 추가적인 탐사 자료와 시추 자료를 이용한다면 경제적이고, 신뢰성 있는 평가가 이루어 질 수 있을 것으로 판단된다.

• 상하수도학회지
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• 제34권5호
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• pp.373-383
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• 2020

The purpose of this study was to evaluate the corrosion damage of large diameter metallic pipes buried in reclaimed land due to the corrosion effect by soil, and to propose a method of installing metal pipes in the reclaimed land. The results are as follow. First, the soil of the reclaimed land was gray clay, the soil specific resistance indicating soil corrosiveness was at least 120 Ω-cm, the pH was weakly acidic(5.04 to 5.60), the redox potential was at least 62 mV, the moisture content was at most 48.8%, and chlorine ions and sulfate ions were up to 4,706.1 mg/kg and 420 mg/kg. Therefore, the overall soil corrosivity score was up to 19, and the external corrosion effect seems to be very large. Second, the condition of straight part of pipes was in good condition, but most of KP joints were affected by corrosion at a severe level. The reason for this seems to be that KP joints accelerated corrosion due to stress and crevice corrosion in addition to galvanic corrosion in the same environment. Third, as a result of evaluating correlations of each item that affects the corrosion on the external part, the lower the soil resistivity and redox potential, the greater the effect on the KP joints corrosion, and the moisture content, chloride ion, and sulfate ion, the higher the value, the greater the effect on the corrosion of KP joints. In addition, among soil corrosion items, the coefficient of determination of soil resistivity with corrosion of KP joints was the highest with 0.6439~0.7672. Fourth, when installing metal pipes or other accessories because the soil of the reclaimed land is highly corrosive, it is necessary to apply a corrosion preventive method to extend the life of pipes and prevent leakage accidents caused by corrosion damage to the joint.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2005년도 춘계학술대회논문집
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• pp.279-282
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• 2005

Morden electronic equipments are becoming very important in information oriented society, but they are vulnerable to lightning surges. Soil resistivity in the vicinity of grounding electrodes my be affected by the current flowing from the grounding electrodes into the surrounding soil. Electrical conduction in soils depends on the grain size, compactness, and variability of the grain sizes. When a high current is injected into the soil, and the breakdown phenomenon occur. In the present work, Electrical behaviors related to discharge in soils were investigated. The breakdown voltages in soil were lower than that sparkover voltage in air. The breakdown voltage in the gravel layer is relatively low, and the breakdown was caused by the flashover through the surface of gravels