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Keywords: strain measurement
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Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1717
... ABSTRACT: Accurate stress-strain measurements in triaxial compression tests are critical to derive correct values of stiffness, Poisson's ratio, and the Biot a-parameter. Yet, inherent biases can produce unrepresentative rock properties. This study investigates the impact of different...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-831
... ABSTRACT: In the current paper we present results of our first attempt to use Fiber Bragg Grating (FBG) sensors for strain measurements of rock samples under confining pressure. We have demonstrated that the FBG sensors are sensitive to asymmetrical load of rock samples. The main problem...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0820
... Characterization specimen strain measurement fracture frequency dissipation threshold ci threshold stiffness attenuation seismic wave mechanics propagation amplitude wave propagation transducer 1. INTRODUCTION The formation of extensile micro-fractures is associated with yielding of brittle rocks...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0991
... application neutron diffraction deformation strain measurement limestone plane mpa pore pressure permeability Indiana limestone 1. INTRODUCTION Poroelastic behavior in rock mechanics has been studied in great detail since the foundational works of Terzaghi and Biot (Biot, 1941). There have been...
Proceedings Papers

Paper presented at the 48th U.S. Rock Mechanics/Geomechanics Symposium, June 1–4, 2014
Paper Number: ARMA-2014-7130
... Abstract Conventional rock mechanics testing techniques typically involve the loading of samples and measurement of displacements or strains on the outer boundary of the specimen surface. Neutron diffraction based strain measurement techniques represent a unique and powerful tool...
Proceedings Papers

Paper presented at the 47th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2013
Paper Number: ARMA-2013-249
... and generally measure either bulk deformations or deformations of exposed surfaces. This paper describes the development of a neutron-diffraction based strain measurement technique that will permit the mapping of the lattice strains and macroscopic stresses within a geological material in a triaxial stress...
Proceedings Papers

Paper presented at the 43rd U.S. Rock Mechanics Symposium & 4th U.S. - Canada Rock Mechanics Symposium, June 28–July 1, 2009
Paper Number: ARMA-09-179
.... The moduli that can be derived from measured acoustic velocities are in most cases not the same as the moduli derived from strain measurements. To compare the moduli, either the static measurements have to be limited to configurations where the static and dynamic moduli are the same parameter, or a complete...
Proceedings Papers

Paper presented at the The 42nd U.S. Rock Mechanics Symposium (USRMS), June 29–July 2, 2008
Paper Number: ARMA-08-037
... geomechanics strength borehole borehole displacement orientation borehole strain Upstream Oil & Gas compressive stress tangential strain boundary stress strain measurement displacement borehole wall gage strain gage tangential gage block sample breakout compressive strength indication...
Proceedings Papers

Paper presented at the Vail Rocks 1999, The 37th U.S. Symposium on Rock Mechanics (USRMS), June 7–9, 1999
Paper Number: ARMA-99-1133
... Characterization mean value triaxial phase axis deformation shear band sandstone radial strain peak stress triaxial test dilation strain measurement principal strain direction localisation shear crack ellipse anisotropy Rock Mechanics for Indust Arnadei, Kranz, Scott & Srneallie (eds) ¸ 1999...
Proceedings Papers

Paper presented at the The 30th U.S. Symposium on Rock Mechanics (USRMS), June 19–22, 1989
Paper Number: ARMA-89-0099
... strain measurements during drying; the calculations use elasticity theory. The conclusion is made that stresses and strains caused by capillary forces can have a direct impact on experiments that rely on strain measurements to calculate a rock property. Specific problem areas are the performance...
Proceedings Papers

Paper presented at the The 29th U.S. Symposium on Rock Mechanics (USRMS), June 13–15, 1988
Paper Number: ARMA-88-0017
... support system between the invert arch and the rock as a solution to the problem of tunnelling in swelling rocks are presented. Fig.1 Effects of swelling in tunneling (available in full paper) 2 STRAIN MEASUREMENTS IN SWELLING ROCKS The effects of the swelling of the surrounding rock on the structure...
Proceedings Papers

Paper presented at the The 18th U.S. Symposium on Rock Mechanics (USRMS), June 22–24, 1977
Paper Number: ARMA-77-0412
... interpretation. End effects were minimized by lengthening the jack and carrying out strain measurements at the central region only where stresses and strains are homogeneous and plane strain conditions exist. The new method has the same desirable mechanical and operational features as the well-known Goodman...

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