Journal of Japan Society for Safety Engineering
Online ISSN : 2424-0656
Print ISSN : 0570-4480
ISSN-L : 0570-4480
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Volume 38, Issue 1
JOURNAL OF JAPAN SOCIETY FOR SAFETY ENGINEERING_1999_1
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PROPOSAL FOR SAFETY
REVIEW
  • The　Evaluation　of　Fracture　Toughness　of　Rock　in　Wet　Condition　at　Crack　Tip
    [in Japanese], [in Japanese]
    1999 Volume 38 Issue 1 Pages 9-16
    Published: February 15, 1999
    Released on J-STAGE: April 30, 2017
    DOIhttps://doi.org/10.18943/safety.38.1_9
    JOURNAL FREE ACCESS
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    Three　point　bending　tests　were　conducted　to　investigate　the　effect　of　the　chemical　and　wet　environments　on　the　fracture toughness　of　Inada　granite　and　Kimachi　sandstone．The　new　testing　method　was　also　suggested　here　so　that　the　chemical solution　or　water　constantly　can　exist　at　the　crack　tip　during　the　tests．The　fracture　toughness　was　evaluated　by　both　ISRM suggested　method　and　AE（Acoustic　Emission）technique・In　AE　technique，AE　hypocenter　distribution　was　determined　to pinpoint　the　crack　front　and　process　zone，then　stres＄intensity　factor　was　calculated　using　the　crack　length　evaluated　by　AE hypocenters　distribution、 Fracture　toughness　of　the　granite，in　which　significant　decrease　has　not　been　reported　before　even　in　wet　condition，dropped 25％in　wet　condition　when　compared　to　the　one　in　dry　condition，and　also37％down　in　Kimachi　sandstone．The　AE　behaviors in　wet　condition　implys　that　the　fracture　mechanism　could　be　challged　from　brittle　manner　to　possibly　ductile　one.

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