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Proceedings Papers

Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-071
..., a significant difference was found in the coefficients of determination of the different lithotypes. The coefficients in air-dry conditions were over 70%, but they became smaller after water saturation. According to these results, microstructure, porosity, and water saturation influence porous limestones...
Proceedings Papers

Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-031
... for crack initiation (Cci) and crack damage stress (Ccd) level with characteristic properties of the tested marbles. The equation describing the fitted regression line is calculated along with the respective coefficient of determination (R2) for each equation. Because the independent variables correlate...
Proceedings Papers

Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-060
... for the generation of 3D models of the joint surfaces from aerial images taken at a relatively short distance from the slope (10, 7.5, 5, and 2.5 m). Roughness profiles are extracted from the 3D data, and their 2 statistical parameter is used to estimate the Joint roughness coefficient (JRC). Finally, the JRC value...
Proceedings Papers

Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-084
... (pseudo-static) analyses through reductive coefficient of PGA. 1. Introduction During an earthquake, different slender elements such as ancient stone columns, tombstones, furniture, reservoirs, electrical equipment may slide, rock or slide-rock and overturn. Rocking motion of a rigid block on a rigid...
Proceedings Papers

Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-022
... used to correlate static and dynamic moduli, providing coefficients of determination of 0.99 and 0.97, for slow and quick cooling, respectively. It is also remarkable that the Edyn/Est rate was smaller than 1 for elastic moduli over 30 GPa (i.e., 105, 200 and 400 °C) and greater than 1 for lower moduli...
Proceedings Papers

Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-033
... that the BIo and BI1 have a significant relations (ranging of determination coefficients (r2) from 0.69 to 0.88 with strength-based brittleness indices commonly used in practice. Also, based on findings, several rock brittleness classifications are also revised herein. 1. Introduction Brittleness is a key rock...
Proceedings Papers

Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-193
... and the static coefficient. For a detailed explanation of the available debris flow impact models, refer to [16]. For what it concerns variable statistical distributions, in a previous work [9] the authors have demonstrated that hf, vf and can be approximated using a GEV (generalized extreme value...
Proceedings Papers

Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-153
... the differential thermal expansion between minerals constituting the rock. This mechanism is mostly influenced by grain arrangement and minerals thermal expansion coefficient [3,4]. It may be at the source of degradation of rock mechanical properties like elastic moduli, tensile strength or uniaxial compression...
Proceedings Papers

Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-135
... and the obtained results show that the drill rate has a high linear correlation with the UCS of the rock mass (coefficient of correlation R = 0.87) (figure 1-A). The drill rate increases with a decrease of the UCS, which is in agreement with the drilling process and previous studies [3, 14].On the other hand...
Proceedings Papers

Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-195
... of the parameters of the Barton non-linear shear strength criterion were calculated: 8.6 for the joint roughness coefficient (JRC), 79 MPa 2 Mechanics and Rock Engineering, from Theory to Practice IOP Publishing IOP Conf. Series: Earth and Environmental Science 833 (2021) 012192 doi:10.1088/1755-1315/833/1/012192...
Proceedings Papers

Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-178
..., essential to choosing the elastic-restitution coefficients to apply the lumped mass analytical model, a detailed geophysical survey was carried out. We carried out the seismic surveys using a 24 channel Sysmatrack seismograph on the talus slopes to improve the subsurface image and better characterize...
Proceedings Papers

Paper presented at the ISRM International Symposium - EUROCK 2020, June 14–19, 2020
Paper Number: ISRM-EUROCK-2020-018
... upstream oil & gas variance eurock 2020 statistical treatment reservoir characterization rock mechanics coefficient mechanical rock fragmentation normality test rock fragmentation indentation depth edge-chipping test replication number reservoir geomechanics experimental...
Proceedings Papers

Paper presented at the ISRM European Rock Mechanics Symposium - EUROCK 2017, June 20–22, 2017
Paper Number: ISRM-EUROCK-2017-011
... conditions, and thus the potential for dynamic loads. Reservoir Characterization Upstream Oil & Gas metals & mining strength standardized regression coefficient coefficient machine learning structural geology correlation pillar factor safety Maleki mechanics Artificial...
Proceedings Papers

Paper presented at the ISRM European Rock Mechanics Symposium - EUROCK 2017, June 20–22, 2017
Paper Number: ISRM-EUROCK-2017-133
... signals. Each signal is associated with an event of destruction (initiation of a new microcrack or growth of an existing one); for this reason, interpretation of such stochastic information uses: metals & mining wave velocity coefficient Nazarova Upstream Oil & Gas inverse problem...
Proceedings Papers

Paper presented at the ISRM European Rock Mechanics Symposium - EUROCK 2017, June 20–22, 2017
Paper Number: ISRM-EUROCK-2017-054
... ultrasonic waves velocity, thermal conductivity and volumetric heat capacity. well logging silesian granite coefficient kožušníková Reservoir Characterization granite sample porosity granite Upstream Oil & Gas ultrasonic wave velocity procedia engineering 191 log analysis physical...
Proceedings Papers

Paper presented at the ISRM International Symposium - EUROCK 2016, August 29–31, 2016
Paper Number: ISRM-EUROCK-2016-145
... of the impact hammer, a single regres- sion analysis was conducted using IBM SPSS (2013). The coefficient of determination (R2) was chosen to be used for comparing the goodness of fits. The relation between RQD and IBR is presented in Equation 2. A moderate relationship (R2 = 0.78) between RQD and IBR...
Proceedings Papers

Paper presented at the ISRM International Symposium - EUROCK 2016, August 29–31, 2016
Paper Number: ISRM-EUROCK-2016-138
... Wellbore Design Reservoir Characterization Upstream Oil & Gas trajectory sumela monastery wellbore integrity potential rockfall translational velocity restitution Turkey geometry coefficient reservoir geomechanics rockfall Simulation hazard rockfall simulation rockfall...
Proceedings Papers

Paper presented at the ISRM International Symposium - EUROCK 2016, August 29–31, 2016
Paper Number: ISRM-EUROCK-2016-213
... of water for carbon capture and storage (CCS) study. The effective pressure law for permeability is associated with curved iso-permeability lines. We can express the effective pressure as P eff = P c — χ(P c ,P p )P p , where the coefficient χ corresponds to the slope of iso-permeability line according...
Proceedings Papers

Paper presented at the ISRM International Symposium - EUROCK 2016, August 29–31, 2016
Paper Number: ISRM-EUROCK-2016-050
... uniaxial compressive strength vesicular basalt Turkey rock material vesicle uniaxial compression strength test void ratio porosity coefficient core sample Rock Mechanics and Rock Engineering: From the Past to the Future Ulusay et al. (Eds) © 2016 Taylor & Francis Group, London, ISBN 978-1-138...
Proceedings Papers

Paper presented at the ISRM International Symposium - EUROCK 2016, August 29–31, 2016
Paper Number: ISRM-EUROCK-2016-078
... the compo- nents of the force acting on cables and the maximum displacement during the filling of barrier. The load is considered as a sum of a dynamic (qd) and a static (qs) component as it is shown in the following equations: where = dynamic coefficient; f = density of the debris in kg/m3; vf = flow...

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