Preferred orientations of open microcracks in granite and their relation with anisotropic elasticity

Takemura, Takato; Golshani, Aliakbar; Oda, Masanobu; Suzuki, Ken‐ichiro

doi:10.1016/s1365-1609(03)00014-5

Cited by 78 publications

(26 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The correlation between microcrack fabric in granitic rocks and anisotropy of physical properties such as seismic velocity, modulus, compressibility, uniaxial compressive and tensile strength, and fracture toughness has been studied by several authors (SANO et al, 1992;TAKEMURA et al, 2003). It has been reported that the orientation of physical anisotropy corresponded well with that of splitting planes in granites, (CHEN et al, 1999).…”

Section: Introductionmentioning

confidence: 97%

Fracture Toughness Measurements and Acoustic Emission Activity in Brittle Rocks

Nasseri

Mohanty

Young

2006

Pure appl. geophys.

104

View full text Add to dashboard Cite

Fracture toughness measurements under static loading conditions have been carried out in Barre and Lac du Bonnet granites. An advanced AE technique has been adopted to monitor real-time crack initiation and propagation around the principal crack in these tests to understand the processes of brittle failure under tension and related characteristics of the resulting fracture process zone. The anisotropy of Mode I fracture toughness has been investigated along specific directions. Microcrack density and orientation analysis from thin section studies have shown these characteristics to be the primary cause of the observed variation in fracture toughness, which is seen to vary between 1.14 MPa.(m) 1/2 and 1.89 MPa.(m) 1/2 in Barre granite. The latter value represents the case in which the crack is propagated at right angles to the main set of microcracks. The creation of a significant fracture process zone surrounding the propagating main crack has been confirmed. Real-time imaging of the fracture process and formation of fracture process zone by AE techniques yielded results in very good agreement with those obtained by direct optical analysis.

show abstract

Section: Introductionmentioning

confidence: 97%

Fracture Toughness Measurements and Acoustic Emission Activity in Brittle Rocks

Nasseri

Mohanty

Young

2006

Pure appl. geophys.

104

View full text Add to dashboard Cite

show abstract

“…Microcracking patterns and the distribution of intergranular and intragranular microcracks on granites have been studied before (Kudo et al, 1992;Nasseri et al, 2005;Takemura et al, 2003;Vázquez et al, 2010) and after they were affected by fires (Gómez-Heras et al, 2006b;Nasseri et al, 2007). Mineralogy is known to play an important role in granite thermal degradation.…”

Section: Introductionmentioning

confidence: 99%

Influence of mineralogy on granite decay induced by temperature increase: Experimental observations and stress simulation

Vázquez

Shushakova

Gómez-Heras

2015

Engineering Geology

124

View full text Add to dashboard Cite

“…They also concluded that the granite anisotropy was caused by the preferred orientation of the microcracks because the anisotropy disappeared when the microcracks were closed under hydrostatic pressure greater than 100 MPa. Takemura et al (2003) and Takemura and Oda (2005) showed that the anisotropy of the P-wave velocity in Inada granite and Oshima granite was caused by the distribution of open microcracks. Nara et al (2011) reported that P-wave velocities in granite could be generally approximated by the associated Legendre function, which is extended to second-order terms by determining the three-dimensional distribution of P-wave velocity in polyhedral granite specimens.…”

Section: Introductionmentioning

confidence: 99%

Effect of Anisotropy on the Long-Term Strength of Granite

Nara

2014

Rock Mech Rock Eng

View full text Add to dashboard Cite

Granite rock mass is used for various rock engineering purposes. To ensure long-term stability, information about the subcritical crack growth (SCG) and an estimate of the long-term strength (LTS) of the rock are necessary. The influence of the anisotropy of granite on its LTS has not yet been clarified. In this study, the anisotropy of the long-term rock strength was investigated for two types of granite rocks, Oshima granite and Inada granite. Specifically, the effect of the anisotropy in crack propagation on the LTS was examined. The results showed that the LTS of granite is anisotropic, as are the fracture toughness and Brazilian tensile strength measured in this study. The LTS was lowest when crack propagation occurred parallel to the rift plane, where most of the microcracks occur. For Inada granite, which has an anisotropic SCG index, the degree of anisotropy of the LTS increased as the time-to-failure increased. This suggests that the LTS of granite is anisotropic.

show abstract

Preferred orientations of open microcracks in granite and their relation with anisotropic elasticity

Cited by 78 publications

References 22 publications

Fracture Toughness Measurements and Acoustic Emission Activity in Brittle Rocks

Fracture Toughness Measurements and Acoustic Emission Activity in Brittle Rocks

Influence of mineralogy on granite decay induced by temperature increase: Experimental observations and stress simulation

Effect of Anisotropy on the Long-Term Strength of Granite

Contact Info

Product

Resources

About