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Dilatancy

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Proceedings Papers

Paper presented at the 54th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2020
Paper Number: ARMA-2020-1206
... weight required for 0.1%/hr. area closure at various temperatures. (Leyendecker and Murphy. 1975) ARMA 20 1206 Modified Dilatancy Criterion to Optimize Drilling through Salt Sections Garcia, G. Schlumberger, Villahermosa, Tabasco, Mexico Castillo, O. PEMEX, Villahermosa, Tabasco, Mexico Becerril, L...
Proceedings Papers

Paper presented at the 54th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2020
Paper Number: ARMA-2020-1429
... mechanism of Rankine type. The overall behavior of the structure shows similar patterns to what is typically observed in the laboratory for salt specimens. This result suggests that rock salt dilatancy can be a consequence of the material spatial heterogeneity. This approach is then used to investigate...
Proceedings Papers

Paper presented at the ISRM International Symposium - 10th Asian Rock Mechanics Symposium, October 29–November 3, 2018
Paper Number: ISRM-ARMS10-2018-029
... and confined conditions. Complete stress-strain curves were obtained for each test, which allowed calculating the main elastic and peak and residual strength parameters. Experimental results of the dilation angle (which showed its dependence on confining stress and plastic parameter) were fit to available...
Proceedings Papers

Paper presented at the IADC/SPE Drilling Conference and Exhibition, March 6–8, 2018
Paper Number: SPE-189712-MS
... by the von Mises criterion, which is independent of hydrostatic pressure. Connectors are more complicated mechanically and can dilate due to shear forces across threads created by pin/box axial loads, so a von Mises criterion is less plausible as a model for connector failure. Current connector failure...
Proceedings Papers

Paper presented at the Abu Dhabi International Petroleum Exhibition & Conference, November 13–16, 2017
Paper Number: SPE-188247-MS
.... To this solution was added the appropriate quantity of PEG-silane and histidine silane ( Table 1 ) followed by 1 mL of H2O to dissolve. drilling fluids and materials polymer viscosity silica particle annular pressure drilling dilatancy dispersion particle application drilling fluid management...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-496
... permeability, the response of clay shales to short-term loading or unloading (e.g. tunnel excavation) is essentially undrained and excess pore pressure (positive or negative) may develop with the tendency of the material to contract or dilate. A series of undrained triaxial tests were conducted on Opalinus...
Proceedings Papers

Paper presented at the 13th ISRM International Congress of Rock Mechanics, May 10–13, 2015
Paper Number: ISRM-13CONGRESS-2015-232
... Abstract This paper presents the result of the research done on the effect of temperature on the dilatancy of rocks from the Bushveld Igneous Complex (BIC), where the South African Platinum mines are located. The BIC has higher virgin rock temperature (VRT) than the gold mines...
Proceedings Papers

Paper presented at the 13th ISRM International Congress of Rock Mechanics, May 10–13, 2015
Paper Number: ISRM-13CONGRESS-2015-258
.... In such tests the effective state of stress at failure remains unknown and provides room for speculation. The non-linear shape of the failure envelope may have several reasons including the influence of capillary forces or the tendency of a saturated clay shale to dilate as the confining stress is changed...
Proceedings Papers

Paper presented at the 13th ISRM International Congress of Rock Mechanics, May 10–13, 2015
Paper Number: ISRM-13CONGRESS-2015-322
... used to replicate observed failure depths and geometries for a number of case studies in the literature, most notably the AECL Underground Research Laboratory in Manitoba. One thing which these case studies typically ignore, however, is the influence of rock dilatancy on the evolution of brittle...
Proceedings Papers

Paper presented at the 48th U.S. Rock Mechanics/Geomechanics Symposium, June 1–4, 2014
Paper Number: ARMA-2014-7051
... stress creep Upstream Oil & Gas determination creep test transient creep constitutive model creep rate room temperature dislocation density günther salzer model primary creep dilatancy deformation 1. INTRODUCTION The mechanical properties of rock salt are extensively investigated...
Proceedings Papers

Paper presented at the ISRM Regional Symposium - EUROCK 2014, May 27–29, 2014
Paper Number: ISRM-EUROCK-2014-030
... on a constant Poisson's ratio predicting the greatest volumetric strains and the most conservative (largest) dilation angle values. The corrected cycle data appears to agree very closely with the curve calculated based on a variable Poisson's ratio, and roughly fits a previously proposed dilatancy model. Since...
Proceedings Papers

Paper presented at the SPE Latin America and Caribbean Petroleum Engineering Conference, April 16–18, 2012
Paper Number: SPE-153627-MS
... conditions, so their reliability is not universal. Hunsche & Cristescu (1998) analyzed the deformations mechanisms due mostly for the volumetric behavior of rocks. They determined a compressibility/dilatancy boundary for rock salt which is function of the state of stresses that prevails. In 2007...
Proceedings Papers

Paper presented at the Canadian Unconventional Resources Conference, November 15–17, 2011
Paper Number: SPE-147474-MS
... point water permeability (at 3% axial strain). In dilation, the Lower Fine, Lower Amalgamated and Medium Ottawa showed increases in water relative permeability of 35%, 22% and 20% respectively ( Fig. 11 ). The increase in relative permeability to oil and water ( Fig. 12 ) for radial extension tests...
Proceedings Papers

Paper presented at the 12th ISRM Congress, October 16–21, 2011
Paper Number: ISRM-12CONGRESS-2011-114
... ABSTRACT Based on experimental test results for a highly dilatant medium-grained sandstone, a bilinear model of the behavior of rock under compression has been developed to describe not only the compaction of rock material that occurs at low stress levels but also to account for the dilatant...
Proceedings Papers

Paper presented at the 44th U.S. Rock Mechanics Symposium and 5th U.S.-Canada Rock Mechanics Symposium, June 27–30, 2010
Paper Number: ARMA-10-508
... ABSTRACT: This paper discusses about the effect of dilatancy angle in the ground response curve in homogenous and isotropic rock masses. A numerical method proposed by Brown et al. (1983) was implemented in this study by including the effects of elastic strain increments and variable...
Proceedings Papers

Paper presented at the 44th U.S. Rock Mechanics Symposium and 5th U.S.-Canada Rock Mechanics Symposium, June 27–30, 2010
Paper Number: ARMA-10-495
... of crystal physics which are the origin of the mechanical behavior of salt rock. These considerations have allowed demonstrating that the hardening-reducing effect of damage can be put on the same level as the dilatancy, the latter being a function both of deformation work performed above the dilatancy...
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-09-054
... experimentally by different researchers. They proposed models that can deal with the strength, deformability, or dilatancy of rock fractures. These models include several parameters and they are much more complicated than Barton’s model. Experimental data found in the literature are used in this paper...
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-09-157
... Abstract Steam injection for heavy oil recovery increases the pore pressure and temperature of the reservoir, which can lead to shear failure in unconsolidated sands. Volumetric dilation from this type of failure can cause a permeability increase related to the stress path, compaction state...
Proceedings Papers

Paper presented at the 11th ISRM Congress, July 9–13, 2007
Paper Number: ISRM-11CONGRESS-2007-118
... the material follows the non linear Hoek-Brown strength criterion the material has a constant dilatancy angle the validity of Coulomb's theory for earth pressures. Taking into account these assumptions, the earth pressures are calculated on a simplified model of wall retaining earth. Different values...
Proceedings Papers

Paper presented at the Canadian International Petroleum Conference, June 13–15, 2006
Paper Number: PETSOC-2006-064-EA
... has been concentrated on the peculiar rock mechanics behaviour of unconsolidated sand (sand compaction/dilation and permeability evolutions). In this study models for both aspects were included into a new framework with the aim of better understand the relative weight of each mechanism. Results...

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