• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2005년도 Proceedings of ISRS 2005
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• pp.325-328
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• 2005

To estimate presumptive local ground subsidence area near Abandoned Under ground Coal Mine(AUCM) at Samcheok city in Korea, the geological properties of existing ground subsidence area and the geophysical prospecting data were analyzed using GIS. The electrical resistivity survey and seismic reflection survey database were constructed from investigation reports and factors which are related with ground subsidence such as geological map, topological map, land use map, lineament map, groundwater level, RMR (Rock Mass Rating), mining tunnel map and slope database were constructed also to make a comparative study of each parameters. As a result of the spatial analysis of existing ground subsidence area, 9 major factors causing ground subsidence were extracted and a connection between the structure of underground and the ground subsidence was determined from the analysis of geophysical prospecting data. The estimation of presumptive ground subsidence area was performed using the correlation between the result from neural network analysis of 9 factors and the scrutiny of geophysical prospecting data.

• 대한자원환경지질학회:학술대회논문집
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• 대한자원환경지질학회 2004년도 International Symposium
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• pp.9-28
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• 2004

Concern about arsenic is increasing throughout the world, including areas of the United States. Elevated levels of arsenic above current drinking-water regulations in ground and surface water can be the result of purely natural phenomena, but often are due to anthropogenic activities, such as mining and agriculture. The current study correlates arsenic speciation in acid mine drainage and mining influenced water with the important water-chemistry properties Eh, pH, and iron(III) concentration. The results show that arsenic speciation is generally in equilibrium with iron chemistry in low pH AMD, which is often not the case in other natural-water matrices. High pH mine waters and groundwater do not 짐ways hold to the redox predictions as well as low pH AMD samples. The oxidation and precipitation of oxyhydroxides depletes iron from some systems, and this also affects arsenite and arsenate concentrations differently through sorption processes.

• 지질공학
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• 제17권4호
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• pp.535-544
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• 2007

퇴적암에서 발달된 불연속면들은 암반의 공학적 특성들을 결정하는 가장 중요한 인자이다. 이들 불연속면을 기재하는 요소들은 일반적으로 불균질성과 불확실성을 내포하고 있다. 본 연구에서는 이러한 불연속면의 기재요소를 정량적이고 객관적으로 결정하기 위해 확률론적 통계기법을 이용하였다. 울산 일대의 33개의 퇴적암 사면을 선정하여 ISRM(1978)에서 제시한 불연속면의 조사항목을 바탕으로 불연속면의 특성 조사를 수행하였으며, 조사된 항목의 확률분포함수를 분석하여 울산지역 백악기 하양층군 퇴적암류의 지질공학적 특성을 파악하였다.

• 자원환경지질
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• 제34권6호
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• pp.601-615
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• 2001

본 연구지역인 충북 보은군 보은읍 일대는 옥천변성대에 속하며, 도로공사구간 중 1:0.:리 구배로 절취한 암반사 면내의 일부구간에서 평면파괴가 발생하였다. 이 구간은 파괴면과 동일한 방향성을 갖는 불연속면에 의해 추가붕괴가 예상되는 등 불안정한 상태이다. 따라서, 본 사면에 대해 SMR, 평사투영법, 한계평형법으로 안전성을 해석하였다. 그러나, 이러한 방법으로 해석할 수 없는 절취에 따른 암반사면의 응력재분배 및 비선형적인 변위거동에 대해서는 UDEC 을 이용하여 수치해석하고, 보강공법을 적용하여 안정성을 해석해 보았다.

• 지구물리와물리탐사
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• 제7권1호
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• pp.99-104
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• 2004

A combination of drilling, geophysical well logging, and electrical soundings was performed to evaluate seawater intrusion in Baeksu-eup, Youngkwang-gun, Korea. The survey area extends for over 24 $km^2$. To delineate the extent of seawater intrusion, 60 vertical electrical soundings (VES) have been carried out. Twelve wells were also drilled for the collection of hydrogeological, geochemical, and geophysical well logging data, to delineate the degree and vertical extent of seawater intrusion. To map the spatial distribution of seawater in this coastal aquifer, geophysical data and hydrogeochemical results were used, and the relation between the resistivity of groundwater and equivalent NaCl concentration was found. Layer parameters derived from VES data, various in-situ physical properties from geophysical well logging, and the estimated equivalent NaCl concentration were very useful for quantitative evaluation of seawater intrusion. Our approach for evaluating seawater intrusion can be considered a valuable attempt at enhancing the use of geophysical data.

• Nuclear Engineering and Technology
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• 제42권1호
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• pp.9-16
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• 2010

Experimental examinations for evaluating fracutres were conducted by using transparent replicas of a single fracture in order to obtain the fracture data to contribute to the methodlogy on how to improve the definitaion of representative parameter values used for a parallel plate fracture model. Quantitative aperture distribution and quantitative tracer concentration data at each point in time were obtained by measuring the attenuation of transmitted light through the fracture in high spatial resolution. the representative aperture values evaluated from the multiple different measurement methods, such as arithmetic mean of aperture distribution measured by the optical method, transport aperture evaluated from the tracer test, and average aperture evaluated from the fracture void volume measurement converged to a unique value that indicates the accuracy of this experimental study. The aperture data was employed for verifying the numerical simulation under the assuption of Local Cubic Law and showed that the calculated flow rate through the fracture is 10%-100% larger than hydraulic test results. The quantitative tracer concentration data is also very valuable for validating existing numerical code for advection dispersion transport in-plane heterogeneous fractures.

• Geomechanics and Engineering
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• 제13권6호
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• pp.997-1010
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• 2017

The black box model is a relatively new option for nonlinear dynamic system identification. It can be used for prediction problems just based on analyzing the input and output data without considering the changes of the internal structure. In this paper, a black box model was presented to solve unconstrained overlying strata movement problems in coal mine production. Based on the black box theory, the overlying strata regional system was viewed as a "black box", and the black box model on overburden strata movement was established. Then, the rock mechanical properties and the mining thickness and mined-out section area were selected as the subject and object respectively, and the influences of coal mining on the overburden regional system were discussed. Finally, a corrected method for height prediction of the fractured zone was obtained. According to actual mine geological conditions, the measured geological data were introduced into the black box model of overlying strata movement for height calculation, and the fractured zone height was determined as 40.36 m, which was comparable to the actual height value (43.91 m) of the fractured zone detected by Double-block Leak Hunting in Drill. By comparing the calculation result and actual surface subsidence value, it can be concluded that the proposed model is adaptable for height prediction of the fractured zone.

• 지질학회지
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• 제54권6호
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• pp.677-682
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• 2018

지구 자기장은 지구 내부 및 지표면 근처에서 일어나는 다양한 자화 특성 변화에 민감하게 반응하며, 이러한 지구물리적 특성은 현장에서 측정된 자기 이상치의 정량적 분석을 통하여 특정화된다. 이 연구에서는 자기 이상치 분석에 활용될 수 있는 유한요소법 기반 수치모델링을 콤솔 멀티피직스를 사용하여 구현하였다. 구현된 수치모델링 방법은 기존에 알려진 해석해와 비교하여 그 유효성을 검증하였으며, 중앙해령에서 지자기 역전과 단층 구조 사이의 상관관계를 모사하는 데 적용하였다. 이러한 유한요소 기반의 지자기 모델링 기법은 다중 물리적 현상 모사에 손쉽게 적용될 수 있다.

• 한국지구과학회지
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• 제32권3호
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• pp.306-323
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• 2011

본 연구의 목적은 잘 알려진 광물과 암석의 한국어, 조선어, 영어, 중국어, 일본어 용어의 유래를 분석하는 것이다. 광물과 암석의 영어와 중국어는 모두 표준화되어 있지만, 일본어, 조선어, 한국어 중 일부분은 표준화되어있지 않다. 한국의 많은 연구자들은 이러한 상황을 인식하고 용어를 표준화하기위해 노력하고 있지만, 대부분의 광물과 암석 용어는 연구되지 않은 채 사용되고 있다. 광물 용어는 28가지 지질학적 성질 중 주로 화학 조성, 색, 모양, 물질을 기초로 명명되었으며, 암석 용어는 30가지 지질학적 성질 중 주로 광물 조성, 성인, 물질, 모양을 기초로 명명되었다. 124종의 영어 용어 중 23종이 사람 이름이나 지역 이름에서 기원한 것이고, 동양에서는 오직 3종만이 지역 이름에서 명명되었다. 동양 용어는 동일 영어 용어에 비해 더 복합적인 지질학적 성질로 구성되는 경향이 있다. 복합적인 지질학적 성질을 가진 광물 용어의 경우, 영어는 2종, 동양 용어는 평균 28종으로 동양 용어가 압도적으로 많으며, 암석 용어의 경우, 영어는 5종, 동양 용어는 평균 9.25종으로 동양 용어가 많은 것으로 분석된다. 일부의 한국어 용어는 일본어나 영어 용어를 어떠한 고려도 하지 않고 그대로 반영되었기 때문에 학생들이 이해하기 매우 어렵다. 그러므로 선행적으로 용어의 의미와 적절성에 대해서 논의되어야 한다.

• 한국광물학회지
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• 제10권2호
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• pp.114-125
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• 1997

The purpose of this study is to clarify the geological occurrence, mineralogical, physico-chemical and thermal properties of the sericite ore which located in Chungha area, Kyungsangbuk-do. The geology of this area are composed mainly of hornfels and some felsite porphyry. The sericitic ore is classified into sericite, sericite-quartz and quartz-sericite ore according to mineral assemblages. Mineral components in sericite ore are mainly sericite with minor quartz, apatite, sphene, zircon, ilmenite, bismuthinite, iron oxide and etc. Sericite-quartz ore are mainly composed of sericite and quartz. Accessary minerals are muscovite, epidote, zircon, sphene, iron oxide and etc. The chemical compositions of K2O, Al2O3, & Ignition loss in sericite and sericite-quartz ore increase than that of the host rock, while the composition of SiO2, Na2O & Fe2O3 decrease. Sericite and sericite-quartz ore are characterized by the specific gravity of 2.35 and 2.44, the pH of 4.36 cP and 2.36 cP respectively. The result of size analyses of sericite ore is 11.3% in grain volume concentration between 12.9 $\mu\textrm{m}$ and 11.1$\mu\textrm{m}$, and 32.3% between 9.6$\mu\textrm{m}$ and 12.9$\mu\textrm{m}$. The thermal expansivity of sericite and sericite-quartz ore show the similar pattern. The sericite ore shows the thermal expansivity of 0.31% at 50$0^{\circ}C$, 0.39~0.75% at 600~1,00$0^{\circ}C$ and 0.74% at 1,10$0^{\circ}C$. The sericite-quartz ore show the thermal expansivity of 0.29% at 50$0^{\circ}C$, 0.36~0.72% at 600~1,000% and 0.71% at 1,10$0^{\circ}C$.