白浜砂岩の変形・破壊挙動に及ぼす水と載荷速度の影響

概要

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Uniaxial compression tests, Brazilian tests and fracture toughness tests were carried out on dry and wet specimens of Shirahama sandstone at several loading rates. Effects of water in the uniaxial compression tests were as follows: (1) UCS and Youngs modulus decreased by 42 % to 47 % and 42 % to 46 %, respectively; (2) Poissons ratio increased slightly; and, (3) No obvious effects were observed on the critical strains. Effects of loading rate were as follows: (1) UCS and Youngs modulus decreased as loading rate decreased; (2) No obvious effects were observed on Poissons ratio; and, (3) Critical compressive strain and the absolute value of the critical extensile strain decreased as loading rate decreased. It was clarified in the fracture toughness and Brazilian tests that the fracture toughness / indirect tensile strength decreased by 70 % to 80 % / 52 % to 72 %, respectively, and that a positive linear correlation was observed between fracture toughness / indirect tensile strength and logarithm of loading rate, respectively. Mechanisms of the above observations were discussed based on the breakage of interlocking between such mineral particles as quartz and plagioclase. Breakage of cementing by illite was also considered.
社団法人資源・素材学会の論文
2000-07-25