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Keywords: strength
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Proceedings Papers

Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-121
... Strength), 115 is the RWS of the TNT. An important change was made in terms of the A coefficient calculation: since it is related to the type and quality of the rock mass, Cunningham expressed it as a function of the discontinuities, density and hardness of the rock: A=0,06 (RMD+RDI+HF) (3) where RDI (Rock...
Proceedings Papers

Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-132
..., one aspect that is seldom considered in analysis of hard rock pillars, and indirectly in synthetic rock mass models to determine rock mass strength, is the actual stress level and stress path imposed on the pillar due to the excavation sequence and the location of the pillars within the mine lay out...
Proceedings Papers

Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-131
... parameters, the Brazilian test for tensile strength determination, uniaxial compressive strength determination test (where Young s modulus and Poisson coefficient were also 2 Mechanics and Rock Engineering, from Theory to Practice IOP Publishing IOP Conf. Series: Earth and Environmental Science 833 (2021...
Proceedings Papers

Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-107
... performed a series of continuum-based FEM 3D simulations of mine excavation and rock mass strength degradation. Our results allowed assessing the global stability of the abandoned mine and identifying critically stressed roof sectors and pillars to prioritize the local-scale analysis, remediation...
Proceedings Papers

Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-113
... modeled because the current state of knowledge on the topic is deficient. Undoubtedly, it is a complex phenomenon which can be influenced by many factors such as rock strength, block shape, presence and properties of discontinuities, stiffness of the ground and impact conditions [5]. In recent years...
Proceedings Papers

Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-162
... spalling strength envelope. Particularly CI stress at low confining stress ( C/ 3 < 0.05 and 1/ 3 < 10) is important for defining spalling around an underground excavation in hard rock. We summarize 59 UCS tests and 197 triaxial tests ( 3 < 2.5 MPa) with sedimentary, magmatic, and metamorphic rocks...
Proceedings Papers

Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-190
.../1755-1315/833/1/012187 2. Methods and materials 2.1. Materials and samples Experiments were performed using samples of Blanco Mera granite, which is a coarse-grained (1 6 mm) rock of moderate strength. Properties of this material have been previously reported elsewhere [46], and a short summary...
Proceedings Papers

Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-124
... to measure a specific characteristic (i.e. tensile strength) against other products. The output obtained from laboratory tests are not understood, cannot be benchmarked against good or poor performing products or quantitatively related to the performance of the product when applied in-situ on a large scale...
Proceedings Papers

Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-175
... performance index developed by Sullivan, 2013 can be used to evaluate the competence and performance of a particular excavated rock slope and to predict measures for support and reinforcement. These methods are based on several factors influencing the strength and deformability of the rock masses (joint...
Proceedings Papers

Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-165
... experimental laboratory program which was expanded to include numerical simulations with FLAC3D. The subject of the laboratory tests are jointed sandstone samples. The test program of the rock mechanical standard tests was supplemented by special tests, such as adhesive tensile strength tests to determine...
Proceedings Papers

Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-176
... - 3200 780 - 940 22 1 = average compressive strength of the masonry, 2 = average shear strength of the masonry, 3 = mean value of the modulus of normal elasticity, 4 = mean value of the modulus of tangential elasticity, 5 = average specific weight of the masonry. 4.2. Verification 2 For a further control...
Proceedings Papers

Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-129
... rock properties including uniaxial compressive strength (UCS), Brazilian tensile strength (BTS), brittleness (BI), rock quality designation (RQD), elastic modules (E) and Poisson ratio ( v ); and also RBMs operational parameters including Instantaneous penetration rate (IPR), Specific Energy (SE...
Proceedings Papers

Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-118
...-visco-plastic model taking into account the anisotropies in stiffness and strength. The coupled THM formulation is based on the Biot theory. Different simulations including full THM coupling and HM coupling with or without creep behavior of COx claystone have been performed to show the effect...
Proceedings Papers

Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-136
...Mechanics and Rock Engineering, from Theory to Practice IOP Publishing IOP Conf. Series: Earth and Environmental Science 833 (2021) 012136 doi:10.1088/1755-1315/833/1/012136 An approach to estimate coal pillar strength A S Sharipov and A C Adoko School of Mining & Geosciences, Nazarbayev University...
Proceedings Papers

Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-195
..., issued in April 2021 [4], when dealing with rock, only partial factors for the shear strength of rock are considered, and their values are the same as for the effective shear strength of soils. Although there is no mention to it, they should apply indiscriminately to rock masses, rock Content from...
Proceedings Papers

Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-036
.... The strength and deformational behaviour of rocks under loading conditions are important in underground excavations, mining and every civil engineering constructions as it determines the stability of such structures. This study aims to augment the existing know-how on such behaviour through analysis of point...
Proceedings Papers

Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-071
... density, water absorption, apparent porosity, uniaxial compressive and tensile strength tests were performed to obtain data set for correlation analysis. With water saturation under atmospheric pressure, the uniaxial compressive strength and tensile strength of all studied lithotypes were reduced...
Proceedings Papers

Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-012
...Mechanics and Rock Engineering, from Theory to Practice IOP Publishing IOP Conf. Series: Earth and Environmental Science 833 (2021) 012017 doi:10.1088/1755-1315/833/1/012017 The importance of accounting for matedness when predicting the peak shear strength of rock joints F Ríos-Bayona1, E...
Proceedings Papers

Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-007
... understood. Recent researches have suggested that the spalling strength can be related to the crack initiation point. Various methods have therefore been proposed to identify the crack initiation at laboratory scales based on stress-strain response. Limited models are also available based on applied stresses...
Proceedings Papers

Paper presented at the ISRM International Symposium – EUROCK 2021, September 21–24, 2021
Paper Number: ISRM-EUROCK-2021-088
...-strain hardening behavior. For example, Hirth and Tullis [16] reported the results of triaxial experiments on quartz aggregates under very high confining pressures, which is almost 6 times its uniaxial compressive strength. There are many yield criteria for the initiation and evolution of plastic...

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