Fracture toughness anisotropy in granitic rocks

Nasseri, M. H. B.; Mohanty, B.

doi:10.1016/j.ijrmms.2007.04.005

Cited by 181 publications

(65 citation statements)

References 25 publications

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“…Based on our findings, we attempted to relate the structural differences observed within the damage zones for these two cases to the nature of the interaction between test crack and pre-existing microstructural fabric orientation. This study is the continuation of research presented in earlier publications, i.e., Nasseri et al (2005), and Nasseri and Mohanty (2008).…”

Section: Introductionsupporting

confidence: 61%

“…from earlier studies 2.1 Petrofabric characterization and fracture toughness measurements in earlier Barre granite studies Quantitative analysis of grain size distribution, grain aspect ratio and microcracks of Barre granite along three orthogonal directions has been carried out and documented in earlier publications (Nasseri et al 2005;Nasseri and Mohanty 2008). In these studies, it was found that Barre granite is a mediumto fine-grained granodiorite characterized by a very consistent composition that consists of 56% feldspar, 27% quartz, 9% biotite mica, and 6% muscovite mica and other accessory minerals.…”

Section: Experimental Procedures and Resultsmentioning

confidence: 99%

“…We used the cracked chevron notched Brazilian disc (CCNBD) test method (ISRM 1995, Fig. 2) to study the anisotropy in fracture toughness (highest K IC /lowest K IC ) in Barre granite (Nasseri and Mohanty 2008). The Brazilian disc samples ( Fig.…”

Section: Experimental Procedures and Resultsmentioning

confidence: 99%

“…Kxy is used to identify the plane along which the fracture toughness is determined. The first index (x) in this example represents the direction of the axis normal to the tested plane, while the second index (y) indicates the direction of an axis that is parallel to the tip of the notches, (Nasseri and Mohanty 2008) described above. The specimens, each with a dimension of 10×15×15 mm, were sent to the University of Hokkaido, Japan, for X-ray CT scanning.…”

Section: Experimental Procedures and Resultsmentioning

confidence: 99%

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Analysis of fracture damage zone in anisotropic granitic rock using 3D X-ray CT scanning techniques

2010

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This paper documents the testing of Barre granite specimens for fracture toughness under mode I, along two different directions with respect to microstructural fabrics. The morphology of cracks was measured by applying a 3D Objects Counter plug-in technique on micro Computed Tomography (CT) images of specially prepared tested specimen for two directions of crack propagation (approximately 500 images of the failed profile were taken along three orthogonal planes). The research objectives of this study were determination of volumetric variation of induced fracture surfaces, analysis of the nature of their structures, and evaluation of mineralogical contribution toward the total test crack passage area along the two specified planes characterized by maximum and minimum fracture toughness values. The results obtained justify the fracture toughness anisotropy in Barre granite, reflecting differences in the structure of its damage zones. The damage zone for the situation in which the test crack was forced to propagate perpendicular to preferably oriented preexisting micro-

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Section: Introductionsupporting

confidence: 61%

Section: Experimental Procedures and Resultsmentioning

confidence: 99%

Section: Experimental Procedures and Resultsmentioning

confidence: 99%

Section: Experimental Procedures and Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Analysis of fracture damage zone in anisotropic granitic rock using 3D X-ray CT scanning techniques

2010

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“…grain size (Tuğrul and Zarif, 1999;Akesson, 2001;Yilmaz et al, 2011), microstructural characteristics (Alm et al,1985;Carvalho et al, 1997;Feng and Yu, 2000;Lindqvist et al, 2007;Vasconcelos et al, 2008;Nasseri and Mohanty, 2008), mineral composition (Miskovsky et al, A C C E P T E D M A N U S C R I P T…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

Freeze–thaw fracturing in building granites

Freire-Lista

Fort

Varas–Muriel

2015

Cold Regions Science and Technology

126

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In situ stress control on microcrack generation and macroscopic extensional fracture in exhuming bedrock

et al. 2014

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Crustal stresses beneath evolving alpine landscapes result from a combination of tectonic strain, bedrock exhumation, and topography. The stress field is regulated by elastic material properties and the brittle strength of critically stressed elements, particularly those within preexisting faults and intact rock. Combining Byerlee's law for crustal stresses with a recently developed trilinear fracture envelope, we propose an extension of the critically stressed crust concept to constrain in situ stresses through microcrack generation and extensional fracture propagation. A compilation of 814 global in situ stress measurements suggests microcrack development will limit long‐term rock strength, and maximum differential stresses in the upper ~1 km of the crust can be controlled by cohesive bedrock behavior. Using an elastoplastic, 2‐D finite‐difference model, we approximate in situ stress development within landscapes undergoing high rates of exhumation in both normal and reverse tectonic regimes. Critical near‐surface stresses in these environments are defined by the microcrack initiation threshold, estimated to be roughly one third of the unconfined compressive strength of intact rock, while stresses deeper in the crust adhere to Byerlee's law. Our models indicate that exhumation‐induced stresses limited by long‐term rock strength are the primary contributor to the near‐surface stress field, while topographic relief reduces stress near valley axes. Simulating glacial erosion then allows us to illustrate a path‐dependent relationship between critical stress development, fracture formation, and geomorphic processes. We find that glacial unloading can generate new microcracks in near‐surface bedrock, resulting in unstable macroscopic extensional (or “exfoliation”) fracture propagation during incision of U‐shaped alpine valleys.

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Fracture toughness anisotropy in granitic rocks

Cited by 181 publications

References 25 publications

Analysis of fracture damage zone in anisotropic granitic rock using 3D X-ray CT scanning techniques

Analysis of fracture damage zone in anisotropic granitic rock using 3D X-ray CT scanning techniques

Freeze–thaw fracturing in building granites

In situ stress control on microcrack generation and macroscopic extensional fracture in exhuming bedrock

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