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Keywords: rock specimen
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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
... was studied using the Split Hopkinson Pressure Bar testing system. The Incident and Transmitted bars were modeled by the finite element method while the Brazilian rock specimen was simulated using a Bonded Particle Model (BPM). The bars were assumed to behave elastically while the simulated specimen could...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1766
... to their behavior under saturated conditions. Yet, in the field, the rock may be below the water table and thus, it may be saturated. The objective of this study is to find the magnitude of the pore pressure needed for full saturation of a rock specimen. It is part of a larger project to determine the geophysical...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1965
... relaxation experiment ae event specimen rock specimen deformation stress level ARMA21 1965 Laboratory Investigation of Stress Relaxation in Brittle Rocks Using Acoustic Emission and Digital Image Correlation Zafar, Sana Colorado School of Mines, Golden, Colorado, USA Hedayat, Ahmadreza Colorado...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0204
... of rock strength were described first. Then, the new test method in which alternating loading rates and cyclic loading are combined was proposed to investigate the loading-rate dependence of a complete stress-strain curve from a single rock specimen. The test results of Tage tuff showed that the stress...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0447
... ABSTRACT: Several damage processes are associated with the loading of intact rock specimens including closure of existing micro-cracks, initiation of cracks, and finally development of cracks. Ultrasonic imaging techniques have proven to be very successful in providing relatively high...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1612
..., and the relationship between fracture plane and confining stresses is finally clarified. Reservoir Characterization triaxial hopkinson bar system incident bar specimen strain rate reservoir geomechanics dynamic stress confinement rock specimen strength Rock mechanics sandstone Upstream Oil & Gas...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1826
...) constitutive models. Laboratory experiments were performed on a cylindrical granodiorite rock specimen retrieved from a well at a depth of 5561.5 ft in Patua geothermal field in Northern Nevada. In this study, Autolab 1500 (a high-pressure/temperature fully servo-controlled triaxial instrument) was used...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-2059
... together developed a novel true triaxial cell with the capability of studying semi- cylindrical rock specimens under fully anisotropic stress conditions, with radial fluid flow [4]. In this work we present this exciting new experimental setup, together with preliminary experimental results from an ongoing...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-1155
... correlation specimen type iii extreme value distribution reservoir geomechanics material property extreme value distribution spatial correlation factor Upstream Oil & Gas Gaussian distribution rock strength random model spatial correlation rock specimen correlation length Reservoir...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-587
... ABSTRACT: Acoustic emission (AE) were measured during an triaxial n test of a cylindrical salt rock specimen (diameter 150 mm, length 300 mm) from the Asse salt mine in Germany. In order to study the failure processes under dilatant loading conditions we analyze the microscopic formation...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-1414
... deterioration side length mesozoic water-rich sandstone rock specimen mechanics 1. INTRODUCTION In the region of western China, artificial freezing technology is widely used in the construction of mine shafts. The main strata are Mesozoic water-rich sandstone strata (Yang et al., 2014; Li, 2015; Liu et...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0026
... unsatisfactorily control in brittle rock UCS testing. The study here could give a better understanding on rock compression testing and corresponding machine design. reservoir geomechanics displacement loading platen rock specimen Upstream Oil & Gas Mining Science inclination Reservoir...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0028
... journal reservoir geomechanics modeling particle laboratory Wellbore Design Rock mechanics rock specimen creep behavior salt rock contact model section 10 8 Burger numerical model creep test linear parallel contact model 1. INTRODUCTION Salt rock in underground cavern is considered...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-1014
... specimen(45mm dia × 90mm height of sandstone)and sheared using rock triaxial test system to obtained true strength characteristics viz. shear parameters and modulus of elasticity. The paper contains comparison of shear parameters and modulus of elasticity of rock specimens with varying circular opening...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0305
... ABSTRACT: This study introduces a method for determining Mode II dynamic fracture toughness using short-core-in-compression(SCC) rock specimens. The SCC specimens which have two notches are loaded dynamically by split Hopkinson pressure bar apparatus. A pulse shaping technique with copper...
Proceedings Papers

Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-255
... true triaxial testing machine Rock Testing rock specimen principle stress high pressure compression principal stress pressure vessel 1. INTRODUCTION AND BACKGROUND Brittle rock strength can be expressed in terms of the minor principle stress, 3, intermediate principle stress, 2...
Proceedings Papers

Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-502
... Abstract: Measuring permeability through tight fractured rock specimens in the laboratory using fluid injection is known to be challenging. We have collectively performed an extensive series of laboratory fracture permeability experiments using unconfined, triaxially confined, and true...
Proceedings Papers

Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-890
..., orientations and properties. reservoir geomechanics Rock mechanics international journal strength confinement Wombeyan marble Reservoir Characterization heterogeneity marble Bahrani rock specimen grain boundary micro-defected rock Upstream Oil & Gas Mining Science specimen smooth...
Proceedings Papers

Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-653
... to determine the thermal properties of rock samples. The apparatus consists of a ring heater, aluminum adaptor, and a stainless steel base. Three thermocouples are used to measure heat flow through the base. The rock specimen sits on top of the stainless steel base. Twelve thermocouples, arranged vertically...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-510
..., a numerical experiment of rock specimens with different geometries in 3D uniaxial compression was carried out. Specimen geometry (slenderness and shape) and contact properties (loading stiffness and friction) were considered in the simulation. It is found that in the absence of the end constraint, the post...

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