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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.
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.
일축압축하 결정질암석 공식체에서의 응력분포 및 파괴에 대한 연구
정교철 대한자원환경지질학회 1999 자원환경지질 Vol.32 No.1
In rock, there are many microsopic structures which influence the mechnical behavior of rock. Many microstructures interact with each other, and furthermore, material constants vary discontinuously within rock, as most rocks are composed of several minerals. Taking into account this feature, it may be possible to contemplate a microstructure of rock as a unit cell by which the rock is constituted periodically. If this idealization is acceptable, the homogenization method can be applied. In this research, various microcracks on rock specimens were observed through a stereoscopic microscope under uniaxial compression. On the other hand, local stress distribution in the periodic-micro structure was calculated by the homogenization method. Then it is shown that there is a possibility to establish a relation between the behavior of microcrack and macroscopic load quantitatively by the linear fracture mechanics.