凍結状態にある登別溶結凝灰岩の強度と破壊プロセスに与える温度と載荷速度の影響

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Understanding strength characteristics of frozen rocks is important for stability assessment of rock slopes in cold region. In this study, uniaxial compression tests and Brazilian tests were carried out on frozen rock specimens of Noboribetsu welded tuff under temperatures of between -5°C and -20°C. Effects of temperature and loading rate on strength and failure process were examined. Main results are as follows.1) Both temperature and loading rate affected strength of wet rock specimens, while no significant effect was observed for dry rock specimens. Their effects on uniaxial compressive strength are different from those on indirect tensile strength. Uniaxial compressive strength discontinuously increased as temperature decreases from -10°C to -15°C, but indirect tensile strength gradually increased with decrease in temperature. Rate of increase in indirect tensile strength with increase in loading rate was larger than that in uniaxial compressive strength.2) No apparent difference in failure process was observed with varying temperature and loading rate in uniaxial compression test under dry condition. However, stress level at fracture initiation increased at -15°C temperature or with increase in loading rate under wet condition. The increase in such stress level is thought to result in increase in strength.3) Effects of temperature and loading rate were considered with an inclusion model assuming that Youngs modulus of frozen pore water varied with temperature or loading rate. The model succeeded to qualitatively predict the observed phenomena. The increase in strength was thought to result from reduction of stress concentration in rock matrix around pores with increase in Youngs modulus of frozen pore water.
社団法人資源・素材学会の論文
2009-09-25

凍結状態にある登別溶結凝灰岩の強度と破壊プロセスに与える温度と載荷速度の影響

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