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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.
정교철,Jeong, Gyo-Cheol The Korean Society of Economic and Environmental G 1994 자원환경지질 Vol.27 No.5
기존 미소결함에서의 국소적 응력집중은 새로운 미시적 손상의 원인이 되고, 이러한 미시적 손상은 또한 거시적 손상으로 발달하게 된다. 이들 미시적 손상에서 거시적 손상으로의 바달은 그 암석 및 암반의 변형특성으로 나타난다. 지금까지 응력하에서의 미소크랙의 거동에 대한 연구는 많이 되어왔으나, 실제암석의 파괴전 상태에서 미소크랙거동에 대한 역학적 해석은 아직 미비한 실정이다. 본 연구에서는 새로이 개발한 시험장치에 의한 정밀한 관찰로 손상 발달에 대한 이해를 더하였으며, 수학적 균질화 이론에 의해 수치해석 함으로서 그 역학성을 검토하였다. Local stress concentrations often cause new micro-damaging induced by a healed pre-existing defects, and the macro-damage is developed by propagation and coalescence of the micro-damage. The micro-damage causes non-linear deformation in rock material. Considerable work has also been applied to describe mathematically the behavior of cracks under stress. Although these mathematical models can usually be made to agree quite well with the measured data, but it is questionable how well the models describe real rock including microcracks in pre-failure state, such as their micro-damage mechanisms. In the present study, micro-damage initiation and propagation in granitic rock under increasing stress were observed directly. Furthermore, a stress analysis considering the bisphere model was carried out using the homogenization theory to analyze the mechanics of the stress-induced micro-damage.
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.