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Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1265
... ABSTRACT: Combined effect of specimen size and loading rate on the rock tensile strength was investigated in this work. The dynamic rock fracture and disintegration was simulated numerically using the 3D hybrid finite-discrete element computer code CA3. The rock under the impact loading...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0120
... ABSTRACT: This paper aims to experimentally investigate the heat-treated hot dry rock (HDR) samples in response to different loading rates in order to understand the mechanism of fracture initiation and propagation behavior in geothermal rock masses. Semi-circular Bend (SCB) specimens...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-2142
... failure in the underground mines. Brazilian test was carried out to obtain indirect tensile strength of coal samples under seven different loading rates. It was confirmed that indirect tensile strength of the coals decreased with increase in loading rate. The sensitivity of indirect tensile strength...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-264
... test results. The results of this study illustrate the usefulness of the LS-SRM approach in modeling mechanical properties of hard rocks. reservoir geomechanics relation Loading Rate model parameter Modeling & Simulation Itasca particle fjr Reservoir Characterization resolution...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-218
... Characterization Upstream Oil & Gas dynamic equilibrium equilibrium incident bar reservoir geomechanics strength Loading Rate physical test strain rate numerical simulation coefficient stress-strain curve particle rock strength compressive strength specimen contact point numerical result 1...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0641
... to study the conditions for which the induced hydraulic fractures become effective and propagate in rock. Our results show that as the loading rate decreases, only a few of these fractures will propagate. As the loading rate increases, more perforations become active, until ultimately all result in crack...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0305
... determination Upstream Oil & Gas stress wave mode II hydraulic fracturing Loading Rate mode II fracture toughness Reservoir Characterization SCC specimen scc granite specimen toughness stress equilibrium state rock specimen notch granite specimen mode ii dynamic fracture toughness 1...
Proceedings Papers

Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-119
... through new degrees of freedom in overlapping elements. Some specific aspects related to the fracturing of a rock mass subjected to a general bench blast are discussed, such as the influence of mesh refinement, the effects of the stress-loading rate and the number and distribution of preexisting cracks...
Proceedings Papers

Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-369
... Abstract: This paper presents experiments showing that the nominal tensile strength of granite specimens measured in three-point bending tests increases with the logarithm of the loading rate. Based on these experiments, we propose a criterion for macroscopic breakage wherein failure occurs...
Proceedings Papers

Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-424
... increases with the loading rate, revealing the rate dependency that is common for engineering materials. The modeling of the failure process matches well with the experimental results, demonstrating the applicability of the DCA model in predicting the dynamic tensile failure of rock materials...
Proceedings Papers

Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-434
... at stress levels beyond those possible in-situ. The explanation for the inconsistency was found to be the strong impact of loading rate on the pore-collapse stress level. The applicability of an existing rate type compaction model for the Harlingen chalk was confirmed by new variable loading rate laboratory...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-504
... in evolution of load between stress-strain curves when applying different loading rates. The material investigated is outcrop chalk from Stevns, Southern part of Denmark, with a porosity of 43 to 44% and subjected to varying loading rates. The Biot critical frequency is a function of the fluid properties...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-597
...) system. Static fracture toughness values of the granites were also determined to compare with the dynamic fracture toughness. The measured fracture toughnesses K Ic under the static and dynamic loading condition were plotted against the loading rate v on a logarithmic graph. The crack opening behavior...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-296
... of 0 MPa, 2 MPa, 4 MPa, 8 MPa, and 10 MPa were tested under different loading rates. The results show that the rock dynamic tensile strength decreases with the increase of the pre-tension. It is also observed that under the same pre-tension, the dynamic tensile strength increases with the loading rate...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-308
... surface energy increases with the loading rate. Above results indicate a trade-off should be established between the fragment size and energy consumption . 1. INTRODUCTION Crushers are widely used in the mining industry all over the world, which break rocks to extract specific minerals or specific...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-436
... subsidence and induced seismicity resulting from oil and gas production. During traditional single loading rate laboratory experiments, the effect of loading rate on uniaxial compressibility can be ignored to first approximation. In contrast, strongly non-linear compaction occurs when stepwise increases...
Proceedings Papers

Paper presented at the 47th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2013
Paper Number: ARMA-2013-447
... and discussed in detail. Dynamic fracture parameters are obtained by quantitative assessments of testing methods, and controlling factors and failure patterns are also discussed to validate these properties. Fracture toughness and fracture behaviour change with loading rate, in particular, the responses...
Proceedings Papers

Paper presented at the 46th U.S. Rock Mechanics/Geomechanics Symposium, June 24–27, 2012
Paper Number: ARMA-2012-181
... theory, like in the direct-tensile test, but instead is propagation of a fracture or crack until the cylinder splits. Hence, the Brazilian test results are subjected to the fracture-mechanics size effect [1]. In addition, experimental studies pointed out that loading rate, width of and friction between...
Proceedings Papers

Paper presented at the 46th U.S. Rock Mechanics/Geomechanics Symposium, June 24–27, 2012
Paper Number: ARMA-2012-154
... exhibits stress and displacement discontinuities. The transmission coefficient for the non-filled contact fracture increases with higher loading rate. The filled fracture displays lower strength and larger deformation than the non-filled contact fracture, which likely induces the instability of rock masses...
Proceedings Papers

Paper presented at the 46th U.S. Rock Mechanics/Geomechanics Symposium, June 24–27, 2012
Paper Number: ARMA-2012-146
... and direction of fractures depend on theses stresses. On the other hand, the blast loading rate (i.e. applied pressure waveform) which depends on explosive properties and also blasthole dimensions are controllable and affect the pattern of different fracture zones around blasthole. Therefore, to control...

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