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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.