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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
... empirical correlations 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...
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
... rock brittleness indices (BI 2 , BI 3 , BI 4 ), different combination of UCS and BTS. Further, these indices are compared with both BI o and BI 1 as well as each other. It is found that the BI o and BI 1 have a significant relations (ranging of determination coefficients (r 2 ) from 0.69 to 0.88...
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
...: 1.5 M1 = A u log (E) - 11.8, Where E - total accumulated energy in roof and seam, erg, and A - coefficient depending on joint density and expected cave conditions [7]. 85 Hamid Maleki and Heather Lawson / Procedia Engineering 191 ( 2017 ) 82 88 x Damage (severity): A damage rating was developed...
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
... measurements as well as aerial photos are used to prepare slope profiles. According to previous rockfall evi- dences, back analyses are performed to identify the slope surface characteristics like restitution coefficients. For each profile, different rock size and shapes are simulated and corresponding runout...
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
... to this study the correlation is weak if the correlation coefficient is between 0 0.5; medium between 0.5 0.90 and strong between 0.90 1. When we compare the porosity values determined by laboratory tests and image analyses techniques, Table 1. Laboratory test results on basalt samples. nm ni UCS Sample No e...
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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