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Changes of permeability characteristics dependent on damage process in granites
Byung-Gon Chae,정교철,Hak-Joon Kim,Jae-Hyeon Park,Takafumi Seiki 한국지질과학협의회 2005 Geosciences Journal Vol.9 No.4
Fracture properties are closely related to the per-meability characteristics of massive crystalline rocks. In order tounderstand the changes of rock permeability related to the dam-age process, this study performed characterization on changes ofhydraulic properties with both in-situ tests and laboratory tests.The results of in-situ tests showed that permeability coefficientsThe differences are related to the conditions of fracture distribu-tion due to rock damage in the process of tunneling. This studyperformed uniaxial compressive tests (UCT) and water injectiontests in order to understand the relationship between the damageprocess and changes of permeability characteristics by the labo-ratory tests. Crack distribution on each damage grade wasobserved by the acetate peel. According to the results of the tests,the strongly damaged specimens with crack length density of morethan 0.6 cm-1 showed higher values of permeability coefficientsimens have persistent cracks and good connectivity throughoutthe rock specimens. It indicates that rock damage influences onthe permeability characteristics in rocks.
Chae, Byung-Gon,Choi, Jung-Hae,Ichikawa, Yasuaki,Seo, Yong-Seok Korean Nuclear Society 2012 Nuclear Engineering and Technology Vol.44 No.1
To compute a permeability coefficient along a rough fracture that takes into account the fracture geometry, this study performed detailed measurements of fracture roughness using a confocal laser scanning microscope, a quantitative analysis of roughness using a spectral analysis, and a homogenization analysis to calculate the permeability coefficient on the microand macro-scale. The homogenization analysis is a type of perturbation theory that characterizes the behavior of microscopically inhomogeneous material with a periodic boundary condition in the microstructure. Therefore, it is possible to analyze accurate permeability characteristics that are represented by the local effect of the facture geometry. The Cpermeability coefficients that are calculated using the homogenization analysis for each rough fracture model exhibit an irregular distribution and do not follow the relationship of the cubic law. This distribution suggests that the permeability characteristics strongly depend on the geometric conditions of the fractures, such as the roughness and the aperture variation. The homogenization analysis may allow us to produce more accurate results than are possible with the preexisting equations for calculating permeability.
암반사면을 대상으로 다변량 수량화 기법을 응용한 RMR 인자의 수정 가중치 제안
채병곤 ( Byung Gon Chae ),김광식 ( Kwang Sik Kim ),조용찬 ( Yong Chan Cho ),서용석 ( Yong Seok Seo ) 대한지질공학회 2006 지질공학 Vol.16 No.1
본 연구는 지질특성에 따라 해당 지역의 지질조건과 특성을 최대한 반영한 RMR 항목별 가중치를 결정하는 방법을 제안하기 위하여 수행되었다. 이를 위해 본 연구에서는 우선 울산지역에 분포하는 백악기 퇴적암을 대상으로 RMR 분류의 인자별 배점체계를 검토하였다. 이 과정에서 기존 연구들이 수행한 경험적 연구방법을 탈피하여 다중회귀분석을 이용한 객관적·과학적 방법으로 인자별 배점을 설정하였다. 이를 통해 인자별 배점설정의 객관적 근거를 확보한 수정된 RMR 분류체계를 제안하고, 그 결과를 지질학적 관점에서 평가하였다. 다중회귀분석을 위해 RMR 항목과 사면경사를 각각 독립변수와 종속변수로 설정하였다. 다중회귀분석을 통한 수정된 RMR 항목별 가중치는 무결암의 강도가 30, RQD가 18, 불연속면 간격이 8, 불연속면 조건이 32, 그리고 지하수 12로 나타났다. This study was conducted to suggest a method to determine weighting values of each parameter of the RMR system considered with geologic characteristics of a study area. This study reviewed the weighting values of the RMR system for the Cretaceous sedimentary rocks distributed in Ulsan area. Based on the data of field survey at the study area, a multiple regression analysis was used to set up an optimal weighting values of the RMR parameters. For the multiple regression analysis, each parameter of the RMR and the slope gradient were regarded as the independent variable and the dependent variable, respectively. The analysis result suggested a modified weighting values of the RMR parameters as follows; 30 for the intact strength of rock; 18 for RQD; 8 for spacing of discontinuities; 32 for the condition of discontinuities; and 12 for ground water.