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Influence of the Geometry of Guide Groove on Stress Corrosion Index of Rock in Double Torsion Test  

정해식 (서울대학교 지구환경시스템공학부)
미원우삼 (일본 구마모토대학 환경시스템공학과)
전석원 (서울대학교 지구환경시스템공학부)
Publication Information
Tunnel and Underground Space / v.14, no.5, 2004 , pp. 363-372 More about this Journal
Abstract
Double torsion (DT) tests were carried out to investigate the influence of the geometry of guide groove on stress corrosion index of Kumamoto andesite. The fracture toughness was measured in the constant displacement rate, which was set to 2.07 MN/m$^{3}$2/ in average regardless of crack velocity. Stress corrosion indices, n were evaluated using specimens with rectangular, circular and triangular grooves and were 37, 36 and 38 in average, respectively. The n values were constant regardless of the groove geometry, however the DT specimen with triangular groove geometry showed the largest standard deviation in the relationship between crack velocity and stress intensity factor. The DT test was found to be effective in using a rectangular-grooved specimen and the width of the groove must be greater than the average grain size of minerals.
Keywords
Andesite; Double torsion test; Fracture toughness; Stress corrosion index; Guide groove;
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