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Keywords: microcrack
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Proceedings Papers

Paper presented at the ISRM International Symposium - EUROCK 2016, August 29–31, 2016
Paper Number: ISRM-EUROCK-2016-002
... ABSTRACT: Damage of brittle rocks is characterized by growth and coalescence of micro-cracks. This process is governed by existing microcracks, subcritical and critical crack growth and stress level. In addition, the rock behavior is influenced by the micro structure, which is characterized by...
Proceedings Papers

Paper presented at the ISRM International Symposium - EUROCK 2016, August 29–31, 2016
Paper Number: ISRM-EUROCK-2016-016
..., and these planes have different physical properties and strengths. In this study, Pocheon granite in Korean was selected to investigate its elastic anisotropy and strength anisotropy. According to scanning electron microscope observations, Pocheon granite has a higher density of microcracks in the...
Proceedings Papers

Paper presented at the ISRM Regional Symposium - EUROCK 2015, October 7–10, 2015
Paper Number: ISRM-EUROCK-2015-114
... rocks, semi-circular bend (SCB) tests were performed, using one sedimentary and two types of crystalline rock. The distributions of inherent microcracks and grains have a preferred orientation in these rocks. Therefore, two types of the specimen in different orientations were prepared based on...
Proceedings Papers

Paper presented at the ISRM Regional Symposium - EUROCK 2014, May 27–29, 2014
Paper Number: ISRM-EUROCK-2014-016
...- tial stage of axial compression was due to elastic as well as plastic closure of inclined microcracks (Alam et al. 2014) and its increase was due to nucleation and Figure 9. CT and thin section images and thickness of cementing materials of post compression specimens of Kimachi sandstone. coalescence...
Proceedings Papers

Paper presented at the ISRM Regional Symposium - EUROCK 2014, May 27–29, 2014
Paper Number: ISRM-EUROCK-2014-054
... viscoelastic material compression relaxation test Reservoir Characterization stress relaxation compression microcrack diameter relaxation test impression relaxation test salt rock indenter Rock Engineering and Rock Mechanics: Structures in and on Rock Masses Alejano, Perucho, Olalla & Jiménez...
Proceedings Papers

Paper presented at the ISRM Regional Symposium - EUROCK 2014, May 27–29, 2014
Paper Number: ISRM-EUROCK-2014-055
... composite materials such as rocks and concrete and may present in different forms including porosity, weak grain boundaries and microcracks. Microcracks are often present in crystalline rocks in two forms: natural and stress-induced; the amount of stress-induced microcracking increasing with depth and...
Proceedings Papers

Paper presented at the ISRM International Symposium - EUROCK 2010, June 15–18, 2010
Paper Number: ISRM-EUROCK-2010-013
... emission techniques became an impor- tant tool in rock mechanics where the effect is often referred to as microseismic activity (Hardy 2003). The fracture behavior of a rock is known to be governed by the formation, growth and interaction of microcracks. Acoustic emissions are a promising tool to study...
Proceedings Papers

Paper presented at the ISRM International Symposium - EUROCK 2005, May 18–20, 2005
Paper Number: ISRM-EUROCK-2005-069
...Eurock 2005 -Impact of Human Activity on the Geological Environment - Konecny (ed) © 2005 Taylor & Francis Group, London, ISBN 04 1538 042 1 Developing of the image segmentation methods to rock microcracks analysis B. Obara Strata Mechanics Research Institute, Polish Academy of Sciences, Krakow...
Proceedings Papers

Paper presented at the ISRM International Symposium - EUROCK 2005, May 18–20, 2005
Paper Number: ISRM-EUROCK-2005-065
... Reservoir Characterization crack propagation direction Upstream Oil & Gas crack density specimen granite crack growth behavior dt test geometry hydraulic fracturing fractal dimension microcrack crack growth stress intensity factor stress-induced crack path activation energy...
Proceedings Papers

Paper presented at the ISRM International Symposium - EUROCK 2002, November 25–27, 2002
Paper Number: ISRM-EUROCK-2002-033
..., Luted, SWEDEN, erling.nordlundtiice.luth.se ABSTRACT It has been studied whether or not microcracks are present in cores subjected to overcoring, by c~nducting diametrical measurements of p-wave velocity and by mapping of microcracks on ~ n sections taken from the overcored cores. From the p-wave...
Proceedings Papers

Paper presented at the ISRM International Symposium - EUROCK 96, September 2–5, 1996
Paper Number: ISRM-EUROCK-1996-046
... ABSTRACT: Rock and rock masses are composed of discrete elements of microstructures such as different grains and microcracks. In this study, first we show experimental results that a propagation, coalescence and increased density of microcracks cause mesoscale and macroscale cracks, and that...
Proceedings Papers

Paper presented at the ISRM International Symposium - EUROCK 96, September 2–5, 1996
Paper Number: ISRM-EUROCK-1996-168
... Reservoir Characterization Martin intersection cube thin section Upstream Oil & Gas microcrack Lac du Bonnet granite granite p-wave velocity orientation variation MPa grey granite s-wave velocity polarisation borehole extension tunnel face 2 Eurock '96, Barla (ed...
Proceedings Papers

Paper presented at the ISRM International Symposium - EUROCK 93, June 21–24, 1993
Paper Number: ISRM-EUROCK-1993-026
... is proposed to describe the stress induced microcracking of the rock. This model will be applied to the analysis of an horizontal well. The numerical results show very cleary that the stress and strain distribution around the wellbore is strongly influenced by the development of microcracks...
Proceedings Papers

Paper presented at the ISRM International Symposium - EUROCK 93, June 21–24, 1993
Paper Number: ISRM-EUROCK-1993-019
... ABSTRACT: A deformation model of rock is developed based on the analysis of microcracks under compression. The relations between stresses, crack growth, and the induced deformation are established. The post-failure stage is simulated by considering a shear failure band formed due to the...
Proceedings Papers

Paper presented at the ISRM International Symposium - EUROCK 93, June 21–24, 1993
Paper Number: ISRM-EUROCK-1993-129
.... 2. MICRO CRACK STABILITY: Cohesive forces acting near a microcrack edge represent an internal load that deforms the crack lips and lead to a stress intensity factor which balances the one due to the external loading; the stress field remains thus finite at the crack edge; in the whole cohesive zone...

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