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Keywords: plastic zone
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Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1600
... is used to estimate the stress and the size and properties of the plastic zone for different arrangements and shapes of 3D openings. We start with simple shaped openings and simple in-situ stress conditions to consider the effects of excavation size, rock properties, and depth. In the future, we plan...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1203
... including deformation, dilatancy safety factor, plastic zone, volume shrinkage, and equivalent strain are used to analyze the stability of the cavern. Results show that the displacement, plastic zones, and equivalent strain gradually decrease with increase of sediment heights. The dilatancy safety factor...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-2156
... behavior upstream oil & gas tunnel convergence specimen ground material circular tunnel elastic zone international journal burger plastic zone tunnel equation ARMA 21 2156 Visco-Elastic-Plastic Solution for Deep Circular Tunnels in Squeezing Ground Arora, K. and Gutierrez, M. Colorado...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1530
... distance reservoir geomechanics irradiation distance peak region granite plastic zone stress field limestone drilling fluid management & disposal strength temperature field rock surface microwave irradiation distance intensity 1. INTRODUCTION Microwave + machinery rock breaking...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1678
... of such input parameters as far-field stress, pore pressure, uniaxial compressive strength, and hydraulic diffusivity. The transient solid production proceeds by growth of the vanguard zone of influence (ZI) which followed by growing plastic zone, or a cavity which is not empty but is filled by flowing dilated...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1725
... coefficient plastic zone thermal conductivity temperature distribution coefficient heat transfer drilling operation temperature difference plastic thermal stress mechanical property drilling fluid temperature 1. INTRODUCTION The polar region is rich in oil and gas resources and the proven oil...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-253
... zone. A modified equilibrium equation for the ground is used and the elastic and plastic zones of the tunnel are analyzed. The results indicate that gravity and the damaged zone have significant effect on the tunnel convergence. The presented method in this paper is novel and allows the tunnel...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-324
... on the rock face can increase the radius of the plastic zone in rock and ultimately increase the external loads on casing. From the sensitivity an alysis, lowering the plastic strength of rock, higher pressure of cement slurries and crustal stress can increase the external loads on casing according...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-011
... by defining an indicator for growth of the plastic zone around the borehole by using an elastoplastic model which provides more realistic evaluations of wellbore integrity than linear elastic model. Results showed the proposed method finds the mud weight which is high enough to tolerate the breakouts and yet...
Proceedings Papers

Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-385
... & Simulation Fluid Dynamics Artificial Intelligence dilatant zone complex reservoir strength hydraulic fracturing orientation Upstream Oil & Gas volumetric strain cohesion isrv shear stress propagation natural fracture plastic zone interaction deformation in-situ stress ratio fracture...
Proceedings Papers

Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-335
... strength Papamicho plastic region depth erosion friction angle reservoir geomechanics sand production erosion model sand production curve stavropoulou unconsolidated formation Vardoulakis cohesion porosity plastic zone equation 1. INTRODUCTION Sand erosion, in the sense that interests us...
Proceedings Papers

Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-647
...) is widely accepted by the rock mechanics community and has been applied in a great number of projects around the world. Upstream Oil & Gas failure criterion plastic zone Reservoir Characterization displacement consideration rock mass elasto-plastic analysis gravity effect reservoir...
Proceedings Papers

Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-643
... deviatoric strain. By adopting the small strain deformation in the elastic region while large strain deformation in the plastic region, the wellbore stability problem under undrained condition is formulated as solving a system of first order ordinary differential equations in the plastic zone...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-593
... corresponded with the test curves. The variation laws of the plastic zone and deformation in the secondary lining over time were also investigated. Furthermore, the cross sectional shape of the tunnel boundary and thickness of the deformation layer were optimized 1. INTRODUCTION Phyllite is a phyllitic...
Proceedings Papers

Paper presented at the 48th U.S. Rock Mechanics/Geomechanics Symposium, June 1–4, 2014
Paper Number: ARMA-2014-7763
... the fracture opening, length and propagation pressure versus time. We demonstrate that pumping parameters influence the fracture geometry and fluid pressures in weak formations through the diffusion process that create back stresses and large plastic zones as the fracture propagates. We also show...
Proceedings Papers

Paper presented at the 46th U.S. Rock Mechanics/Geomechanics Symposium, June 24–27, 2012
Paper Number: ARMA-2012-396
... ABSTRACT: Growth of plastic zone around boreholes is described in a model with post-failure non-linear power-like strain softening. The failure itself is defined by conventional Mohr-Coulomb criterion. Growth of plastic zone around the inner opening is considered for a hollow (thick-wall...
Proceedings Papers

Paper presented at the 46th U.S. Rock Mechanics/Geomechanics Symposium, June 24–27, 2012
Paper Number: ARMA-2012-545
...). The first two of these criteria were discussed in earlier papers related to depleting reservoirs and fault activation/reactivation. Remote horizontal stresses and vertical stresses are initially given. Axisymmetric conditions are assumed. The calculation proceeds by assuming the existence of a plastic zone...
Proceedings Papers

Paper presented at the 46th U.S. Rock Mechanics/Geomechanics Symposium, June 24–27, 2012
Paper Number: ARMA-2012-272
... the behavior of good to very good quality rock masses (OSI>70). Artificial Intelligence behavior model dilation angle model structural geology Alejano Upstream Oil & Gas tunnel face displacement dilation plastic zone Reservoir Characterization excavation quality rock mass granite...
Proceedings Papers

Paper presented at the 46th U.S. Rock Mechanics/Geomechanics Symposium, June 24–27, 2012
Paper Number: ARMA-2012-308
... plastic zone horizontal axis Reservoir Characterization UCG plant pillar internal pressure gasification cavity gasification cavity reserves evaluation gasification pressure boundary gasification process stress field 1 1. INTRODUCTION Underground coal gasification (UCG) is a promising...
Proceedings Papers

Paper presented at the 46th U.S. Rock Mechanics/Geomechanics Symposium, June 24–27, 2012
Paper Number: ARMA-2012-200
... gasification process underground coal gasification UCG process rock mass preliminary experimental study fort union formation gasification plastic zone cavity principal stress stress condition permeability 1 1. INTRODUCTION Underground coal gasification (UCG) is a clean coal technology...

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