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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.
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.
채병곤 ( Byung Gon Chae ),김원영 ( Won Young Kim ),조용찬 ( Yong Chan Cho ),김경수 ( Kyeong Su Kim ),이춘오 ( Choon Oh Lee ),최영섭 ( Young Sup Choi ) 대한지질공학회 2004 지질공학 Vol.14 No.2
이 연구는 자연사면에서 발생하는 토석류(debris flow) 산사태의 확률론적 예측을 위해 로지스틱 회귀분석(logistic regression analysis)을 이용하여 변성암 및 화강암 분포지에 적용할 수 있는 예측모델을 개발한 것이다. 산사태 예측모델을 개발하기 위해 경기 남·북부지역과 경북 상주지역에서 발생한 산사태 자료를 현장조사와 실내토질시험을 통해 직접 획득·분석하였다. 산사태 발생에 영향을 미치는 인자는 기초 통계분석은 물론 로지스틱회귀분석을 실시하여 최종적으로 7개 영향인자를 선정하였다. 이들 7개 인자는 지형요소 2개와 지질 및 토질특성 요소 5개로 구성되어 있고, 각 인자별 가중치를 부여한 점이 큰 특징이다. 개발된 모델은 신뢰성 검증을 수행한 결과 90.74%의 예측율을 확보한 것으로 나타났다. 이 모델을 이용하여 산사태 발생가능성을 확률적·정량적으로 예측할 수 있게 되었다. In this study, a probabilistic prediction model for debris flow occurrence was developed using a logistic regression analysis. The model can be applicable to metamorphic rocks and granite area. In order to develop the prediction model, detailed field survey and laboratory soil tests were conducted both in the northern and the southern Gyeonggi province and in Sangju, Gyeongbuk province, Korea. The seven landslide triggering factors were selected by a logistic regression analysis as well as several basic statistical analyses. The seven factors consist of two topographic factors and five geological and geotechnical factors. The model assigns a weight value to each selected factor. The verification results reveal that the model has 90.74% of prediction accuracy. Therefore, it is possible to predict landslide occurrence in a probabilistic and quantitative manner.
모형실험 장치를 이용한 산사태 발생 및 사태물질 거동특성 실험
채병곤 ( Byung Gon Chae ),송영석 ( Young Suk Song ),서용석 ( Yong Seok Seo ),조용찬 ( Yong Chan Cho ),김원영 ( Won Young Kim ) 대한지질공학회 2006 지질공학 Vol.16 No.3
본 연구는 모형실험장치를 이용하여 인공강우에 의한 산사태 발생특성과 사태물질의 확산거동특성을 파악하기 위하여 수행되었다. 본 연구에서는 강우강도와 사면경사의 변화에 따른 다양한 실험조건하에서 일정 시간 간격으로 간극수압, 사면붕괴양상 및 변위, 그리고 토사의 확산면적 등을 각각 측정하였다. 실험 중 복수의 비디오 카메라와 디지털 스틸카메라로 촬영한 후, 이미지 분석을 실시하여 시간대별 산사태 발생양상 및 사태물질 확산특성 자료를 취득하였다. 실험결과에 따르면, 간극수압은 강우강도 및 사면경사에 비례하여 변화하며 이에 따라 강우강도 및 사면경사가 커짐에 따라 산사태가 발생할 가능성도 증가하였다. 사태물질의 확산면적은 강우강도, 강우지속시간, 그리고 사면경사의 증가에 비례하는 양상을 가짐을 확인하였다. This study was conducted laboratory flume tests to identify landslide features and flow characteristics of debris using a flume test equipment. Under the several test conditions dependent on rainfall intensity and slope angle, the authors measured pore water pressure, slope failure and displacement, spreading area of debris on a regular time interval. The test processes were also recorded by video cameras and digital still cameras. According to the test results, pore water pressures have trends of direct proportion to the rainfall intensity and the slope angle, resulting in high potential of landslide triggering. The spreading area of debris is also increased with the slope angle and the rainfall intensity as well as the rainfall duration.