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Keywords: rock strength
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Proceedings Papers

Paper presented at the ISRM International Symposium - EUROCK 2020, June 14–19, 2020
Paper Number: ISRM-EUROCK-2020-033
... and solutions (TBM, Mechanical and D&B) in sedimentary rocks. reservoir characterization upstream oil & gas support design structural geology rockmass metals & mining strength weakness plane rock strength reservoir geomechanics rock mechanics bedding sandstone stability tunnel...
Proceedings Papers

Paper presented at the ISRM European Rock Mechanics Symposium - EUROCK 2017, June 20–22, 2017
Paper Number: ISRM-EUROCK-2017-036
... Abstract It is critical to obtain the rock strength along the wellbore to control drilling problems such as pipe sticking, tight hole, collapse and sand production. The purpose of this research is to predict the uniaxial compressive strength based on data of sonic travel time, formation...
Proceedings Papers

Paper presented at the ISRM International Symposium - EUROCK 2016, August 29–31, 2016
Paper Number: ISRM-EUROCK-2016-017
...Rock Mechanics and Rock Engineering: From the Past to the Future Ulusay et al. (Eds) © 2016 Taylor & Francis Group, London, ISBN 978-1-138-03265-1 Estimating the rock strength from a crushability index S. Kahraman Mining Engineering Department, Hacettepe University, Ankara, Turkey O.Y. Toraman...
Proceedings Papers

Paper presented at the ISRM International Symposium - EUROCK 2016, August 29–31, 2016
Paper Number: ISRM-EUROCK-2016-196
... and support components (i.e. in SEM or NATM systems). However, improving ground support requires reliable data. The most common support system used in underground spaces is rock-bolt, its drillhole can be used for probing and obtaining geological data, e.g. rock strength. This paper will introduce a recently...
Proceedings Papers

Paper presented at the ISRM International Symposium - EUROCK 2016, August 29–31, 2016
Paper Number: ISRM-EUROCK-2016-015
... ABSTRACT: This paper describes how to apply fuzzy inference system (FIS) to estimate the strength of field scale rock masses by judgment and experience of practicing engineers. Three important parameters believed to influence the rock mass behavior namely intact rock strength, block size...
Proceedings Papers

Paper presented at the ISRM International Symposium - EUROCK 2016, August 29–31, 2016
Paper Number: ISRM-EUROCK-2016-030
... drilling Upstream Oil & Gas strength rotary drilling uniaxial compressive strength plastic deformation tunnel rock strength penetration rate Drilling Rate Index thrust rock property drillability brittleness rotary-percussive drilling mechanical property compressive strength Drilling...
Proceedings Papers

Paper presented at the ISRM Regional Symposium - EUROCK 2015, October 7–10, 2015
Paper Number: ISRM-EUROCK-2015-173
... and the RFC-system for estimating tunnel conditions in deep gold mines yielded similar rock strength values. Hoek-Brown method of rock mass strength determination resulted in unrealistically low uniaxial compressive strength and relatively low global compressive strength values. Behavior of 7 m wide stope...
Proceedings Papers

Paper presented at the ISRM Regional Symposium - EUROCK 2015, October 7–10, 2015
Paper Number: ISRM-EUROCK-2015-145
... displacement rock mass strength soft rock joint friction angle Upstream Oil & Gas border area rock strength geotechnical design tunnel laboratory test Engineering Purpose classification system excavation friction angle Reservoir Characterization strength cohesion rock friction angle rock...
Proceedings Papers

Paper presented at the ISRM Regional Symposium - EUROCK 2015, October 7–10, 2015
Paper Number: ISRM-EUROCK-2015-041
... and high tool wear rates, the most important rock mass features, such as intact rock strength, rock toughness and rock fracturing must be assessed carefully in the course of preliminary site investigation. Once under operation, additional investigations, like performance documentation, tool wear analysis...
Proceedings Papers

Paper presented at the ISRM Regional Symposium - EUROCK 2014, May 27–29, 2014
Paper Number: ISRM-EUROCK-2014-122
... and rock strength correlation combinations for determining WBS under complex geological conditions.A well quality index (WQI) parameter was defined for calibrating the shear failure gradient (SFG), taking into account the over-gauge observed and the difference between the SFG and mud weight. In addition...
Proceedings Papers

Paper presented at the ISRM Regional Symposium - EUROCK 2014, May 27–29, 2014
Paper Number: ISRM-EUROCK-2014-235
... properties represent the basic inputs to the estimation of rock strength and In-situ stresses, which can be later, refined and calibrated to other available information. Assuming elastic isotropy, DSI dipole sonic measurements (i.e., compressional tC and shear slowness tS ) and bulk density b from well...
Proceedings Papers

Paper presented at the ISRM Regional Symposium - EUROCK 2014, May 27–29, 2014
Paper Number: ISRM-EUROCK-2014-079
...., number of micro-cracks) in the models decreased rapidly with increasing distance from the excavation wall (i.e., increasing confinement). This suggests that the depth of fracturing is controlled by the confinement-dependent rock strength characteristics. It is concluded that the depth of stress...
Proceedings Papers

Paper presented at the ISRM International Symposium - EUROCK 2013, October 23–26, 2013
Paper Number: ISRM-EUROCK-2013-025
... create problems in generalizing the mechanical properties which are essential parameters in geological and engineering practices. 1 INTRODUCTION The measurement of rock strength and characteristics of discontinuities (mainly fractures) are essential tasks in engineering constructions. In general, rock...
Proceedings Papers

Paper presented at the ISRM International Symposium - EUROCK 2012, May 28–30, 2012
Paper Number: ISRM-EUROCK-2012-047
... property prediction plane requirement eurock 2012 brittleness Modeling & Simulation cutter Rostami rock strength database machine performance tensile strength Ozdemir weakness penetration Colorado School of Mines approaches for predicting TBM performance S. Yagiz Pamukkale University...
Proceedings Papers

Paper presented at the ISRM International Symposium - EUROCK 2012, May 28–30, 2012
Paper Number: ISRM-EUROCK-2012-095
... Abstract: The significant effect of the intermediate principal stress on rock strength has been recognised for many years, leading to the development of a number of polyaxial peak strength criteria for rock. Recently, the Mogi-Coulomb and Zhang-Zhu polyaxial peak strength criteria, which can...
Proceedings Papers

Paper presented at the ISRM International Symposium - EUROCK 2010, June 15–18, 2010
Paper Number: ISRM-EUROCK-2010-073
... or from breakouts back-analyses (in situations where the complete stress tensor is independently estimated) delivers a better estimate of the in-situ intact rock strength than laboratory tests. Work is underway to propose solution for the unbiased estimation of in-situ intact rock strength from borehole...
Proceedings Papers

Paper presented at the ISRM International Symposium - EUROCK 2010, June 15–18, 2010
Paper Number: ISRM-EUROCK-2010-170
... lixiviated with micro-porous (1 to 3 micros) has also been identified in the SEM image (Figure 2, right). 2.2 Rock Mechanics Properties Empirical equations that relate rock strength of sed- imentary rocks to physical properties obtained from well-logs have been used to build the geomechani- cal model (Chang...

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