Micromechanics-based prediction of creep failure of hard rock for long-term safety of high-level radioactive waste disposal system

Miura, Kazuhiko; Okui, Yoshiaki; Horii, Hideyuki

doi:10.1016/s0167-6636(02)00286-7

Cited by 79 publications

(25 citation statements)

References 15 publications

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“…Similar mechanical subcritical crack growth phenomenon in geotechnical materials has been investigated by other researchers as well (Barpi and Valente, 2010;Erarslan and Williams, 2012;Naraa et al, 2012). Creep failure of brittle rock is usually attributed to stress corrosion (Miura et al, 2003). Although usually associated with static (creep) load, stress corrosion may also take place during cyclic load, with lower stress intensity due to shorter elapsed time of the applied load (Scholz and Koczynski, 1979).…”

Section: Discussionsupporting

confidence: 60%

“…In some fatigue research, damage accumulation in brittle materials under cyclic loading has been explained by the 'creep' and 'stress corrosion' (Atkinson, 1984;Atkinson and Meredith, 1987;Celestino et al, 1995;Costin and Holcomb, 1981;Evans, 1972;Miura et al, 2003;Xiao et al, 2010). Stress corrosion is the most common mechanism associated with subcritical crack growth in rock.…”

Section: Introductionmentioning

confidence: 99%

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Microstructural investigation of subcritical crack propagation and Fracture Process Zone (FPZ) by the reduction of rock fracture toughness under cyclic loading

Erarslan

2016

Engineering Geology

122

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Section: Discussionsupporting

confidence: 60%

Section: Introductionmentioning

confidence: 99%

Microstructural investigation of subcritical crack propagation and Fracture Process Zone (FPZ) by the reduction of rock fracture toughness under cyclic loading

Erarslan

2016

Engineering Geology

122

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“…Creep behavior is significant for judging the long-term stability of rocks (Miura et al 2003;Damjanac and Fairhurst 2010;Chandler 2013;Lacroix and Amitrano 2013). The stress path strongly influences creep behavior.…”

Section: Introductionmentioning

confidence: 99%

“…Based on the mechanism of subcritical crack growth under stress corrosion, a micromechanics-based method for predicting the creep failure was presented. The creep failure of rock was also predicted under different stress states, temperatures, and contents of water (Miura et al 2003;Nara et al 2010Nara et al , 2013. Furthermore, based on the acoustic emission from microcrack growth during creep under step loading for axial stress, the correlation between the cumulative number of emission events and inelastic creep strain was examined (Lockner and Byerlee 1977;Ohnaka 1983;Grgic and Amitrano 2009;Eslami et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Investigation of Macroscopic Brittle Creep Failure Caused by Microcrack Growth Under Step Loading and Unloading in Rocks

Shao

2016

Rock Mech Rock Eng

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The growth of subcritical cracks plays an important role in the creep of brittle rock. The stress path has a great influence on creep properties. A micromechanics-based model is presented to study the effect of the stress path on creep properties. The microcrack model of Ashby and Sammis, Charles' Law, and a new micro-macro relation are employed in our model. This new micro-macro relation is proposed by using the correlation between the micromechanical and macroscopic definition of damage. A stress path function is also introduced by the relationship between stress and time. Theoretical expressions of the stress-strain relationship and creep behavior are derived. The effects of confining pressure on the stress-strain relationship are studied. Crack initiation stress and peak stress are achieved under different confining pressures. The applied constant stress that could cause creep behavior is predicted. Creep properties are studied under the step loading of axial stress or the unloading of confining pressure. Rationality of the micromechanics-based model is verified by the experimental results of Jinping marble. Furthermore, the effects of model parameters and the unloading rate of confining pressure on creep behavior are analyzed. The coupling effect of step axial stress and confining pressure on creep failure is also discussed. The results provide implications on the deformation behavior and time-delayed rockburst mechanism caused by microcrack growth on surrounding rocks during deep underground excavations.

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“…Since knowledge of the time-dependent fracturing of rock is essential to evaluate the long-term strength or time-to-failure, the investigation of time-dependent fracturing of rock is necessary. Therefore, the investigation of time-dependent crack growth has been extensively conducted to estimate the long-term strength and time-to-failure (Wilkins 1980;Lajtai and Schmidtke 1986;Miura et al 2003;Jeong et al 2003aJeong et al , 2007.…”

Section: Introductionmentioning

confidence: 99%

Subcritical crack growth and long-term strength in rock and cementitious material

Nara

Takada

Mori³

et al. 2010

Int J Fract

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High-strength and ultra low-permeability concrete (HSULPC) is a strong candidate for a radioactive waste package containing transuranic radionuclides (TRU waste) for geological disposal. Knowledge of the time-dependent fracturing of HSULPC and surrounding rock mass is essential to assess the long-term stability of such underground repositories. We have measured crack velocity in andesite and HSULPC both in air and water to examine subcritical crack growth by the Double-Torsion method. In air, the crack velocity in andesite increased when the temperature and relative humidity increased. On the other hand, the temperature and relative humidity had little effect on the crack velocity in HSULPC in air. In water, the crack velocity increased when the temperature was higher for both andesite and HSULPC. Using these experimental results, the longterm strength was estimated. It was shown that the long-term strength of HSULPC was higher than that of andesite. In air, the long-term strength for andesite was affected by the temperature and relative humidity. The long-term strength for andesite decreased when the temperature or relative humidity increased. For HSULPC, the change of the long-term strength with varying temperature or relative humidity was smaller than andesite in air. In water, the long-term strength for both materials decreased with increasing the temperature. Comparing the longterm strength of andesite and HSULPC at the same environmental conditions, it was recognized that the decrease of the long-term strength of HSULPC is smaller than that of andesite. The long-term strength in water was smaller than that in air for both materials.

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Micromechanics-based prediction of creep failure of hard rock for long-term safety of high-level radioactive waste disposal system

Cited by 79 publications

References 15 publications

Microstructural investigation of subcritical crack propagation and Fracture Process Zone (FPZ) by the reduction of rock fracture toughness under cyclic loading

Microstructural investigation of subcritical crack propagation and Fracture Process Zone (FPZ) by the reduction of rock fracture toughness under cyclic loading

Investigation of Macroscopic Brittle Creep Failure Caused by Microcrack Growth Under Step Loading and Unloading in Rocks

Subcritical crack growth and long-term strength in rock and cementitious material

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