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정교철,김진성 안동대학교 환경연구소 2001 환경연구 Vol.1 No.-
The area under investigation for the past ten years is in the vicinity of the Imha dam. The area is excavated for construction of new road in 1989. Differential heave in one part of the area is occurred and differential subsidence and cracking in another part are took place because of the road construction. The rocks involved are sandstone, shale and mudstone. Geotechnical and surveying techniques have been used to analyze slope instability in the past but without solving the problem of the mechanism of the these failure processes. Geophysical methods (electric resistively method and seismic prospecting method) were applied in order to identify underground geology and geological structures. The interpretation of these slope failure studies is not a straightforward analysis, but the general conclusion is that the complexity of a slope failure requires a complex investigative approach by using a combination of different geophysical methods and geotechnical methods.
정교철 안동대학교 기초과학연구소 1996 基礎科學 硏究論文集 Vol.7 No.1
This study was carried out to analyse behavior of blocks in discontinuous rock slopes. The kinematic characteristics, which the discontinuous rocks show on slope, was analysed by various engineering geological factor, and from which a preliminery formula was derived. These blocks tend to failure on the active plane owing to there high angle of dip, at this point it results in toppling failure for the block which has its weight center in the upper part(-vector), and sliding for the block which has its weight center in the lower part(+vector). If, however, those blocks have great undulation angle(i) against active plane, sliding doesn`t happen because of friction force. Therefore, if the undulation angle is known the possibility of failure can be determined. Kinematic conditions of failure are influenced by undulation angle within dilation interval, but they demonstrated as following formula that kinematic conditions of failure are not neary influenced by undulation angle within roughness shear interval. K_(t)=(M_(1)+M_(2)-M_(3))/(M_(1)+M_(2)+M_(3)) M_(1)=cosφ{cosi+sinitan(φ+i)} M_(2)=sinφ{cositan(φ+i)-sini} M_(3)=cositan(φ+i)-sini. And the values of K,in this study area are nearly plotted on limit line of failure.
정교철 안동대학교 기초과학연구소 1997 基礎科學 硏究論文集 Vol.8 No.1
Most rock masses contain a joint system that consist of a number of joint sets. A joint may be defined formally as a fracture that traverses a rock mass and is not accompanied by any discernible displacement of one face of the fracture relative to the other. In addition to, individual joints have variable but finite length. This study describes how the three-dimensional estimation of joint distribution is calculated from surface observations in field for engineering purposes. Three-dimensional joint count is a useful measure of the degree of jointing given as number of joints in a unit volume of rock masses and is easily calculated from standard joint descriptions. The three-dimensional estimation on joint distribution in outcrop can also be used to calculate the interblock size in jointed rock masses.
Brainstorming 기법을 이용한 Business Function Modeling Tool의 개발
김철한,정영교 대전대학교 산업기술연구소 1998 산업기술연구소 論文集 Vol.9 No.2
When function modeling with IDEF0 which is called as a standard methodology for CALS (FIPS 183), the initial work is to determine the purpose and viewpoint, and the next work is to generate a data list and an activity list. These works require participant's discussion and agreements. The main problems for these working are a communication between participants and efficient discussion processing. Brainstorming is the most useful method for these work. The paper is for development for the modeling assistant tool to promote the business modeling. In this paper, we will introduce the tool which name is 'MindMapper'. This tool is an implementation of mind-map method. Using this tool, we refine the result of the brainstorming about activity list and translate the result into the functional model of IDEF0. The translated functional model is prototype model without ICOM arrows.
기술보고 : 미소 촛점 X선 CT를 이용한 암석 내 공극의 분포 및 공극률 분석
정교철 ( Gyo Cheol Jeong ),( Manabu Takahashi ) 대한지질공학회 2010 지질공학 Vol.20 No.4
암석에서의 풍화 및 투수성은 방사성폐기물 지하동굴처분 및 암반구조물의 안정성 확보 및 장기적 관리측면에서 매우 중요한 역할을 한다. 이들 암석의 풍화 및 투수성은 암석의 내부구조 특성에 따라 크게 영향을 받는다. 즉 암석 내부의 공극, 미소크랙 등의 양적 정도에 의해 풍화가 빨리 진행되기도 한다. 또한 암석 내부구조의 양적 평가는 그 암석의 풍화 정도를 정량적으로 평가할 수 있는 수단이 되기도 한다. 따라서 암석의 내부구조를 3차원적으로 정확하게 파악한다는 것은 암반구조물의 장기적 관리 측면에서 매우 중요하다고 하겠다. 이 연구는 국내 신선한 화강암과 풍화된 화강암을 대상으로 X선 CT촬영을 실시하여 3차원적으로 공극의 분포를 분석하였다. 분석 결과는 암석 내부의 공극의 분포와 공극률을 잘 표현하고 있다. Weathering and permeability in rocks play a very important role in underground disposal of radioactive waste and their long-term management as well as stability security of rock structures. Weathering and permeability of rocks are largely controlled by the characters of inner structures of rocks. In other words, weathering rate can be accelerated depending on the quantity of pore and microcrack in rocks. Quantitative evaluation of inner structures of rocks can serve as a tool that can assess the degree of weathering of rocks. Therefore it can be said that the understanding of three dimensional distribution of the inner structure of rocks is important for long-term management of rock structures. This study was performed to analyze three dimensional distribution of pore in rocks using Micro Focus X-ray CT on fresh granite and weathered granite from Korea. Results of the analysis clearly show distribution of pore and porosity of the inner rock.