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The Changes of Aperture Variation and Hydraulic Conductivity for Compression Variability  

채병곤 (한국지질자원연구원 지질환경재해 연구부)
이철우 (한국지질자원연구원 지하수ㆍ지열자원 연구부)
정교철 (안동대학교 지구환경과학과)
김용제 (한국지질자원연구원 지하수ㆍ지열자원 연구부)
Publication Information
Journal of Soil and Groundwater Environment / v.8, no.4, 2003 , pp. 1-11 More about this Journal
Abstract
In order to measure aperture variation dependent on normal stress and to characterize on relationship between aperture variation and hydraulic conductivity this study measured apertures of rock fractures under a high resolution confocal laser scanning microscope (CLSM) with application of five stages of uniaxial normal stresses. From this method the response of aperture can be continuously characterized on one specimen by different loads of normal stress. The results of measurements showed a rough geometry of fracture bearing non-uniform aperture. They also revealed different values of aperture variations according to the load stages on each position along a fracture due to the fracture roughness. Laboratory permeability tests were also conducted to evaluate the changes of permeability coefficients related to the aperture variations by different loads. The results of permeability tests revealed that the hydraulic conductivity was not reduced at a fixed rate with increase of normal load. Moreover, the rates of aperture variations did not match to those of hydraulic conductivity. The hydraulic conductivity calculated in this study did not follow the cubic law, representing that the parallel plate model is not suitable to express the fracture geometry corresponding to the results of aperture measurements under the CLSM.
Keywords
confocal laser scanning microscope (CLSM); aperture variation; fracture roughness; hydraulic conductivity; hydraulic aperture;
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Times Cited By KSCI : 1  (Citation Analysis)
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