Conditions for compaction bands in porous rock

Issen, Kathleen A.; Rudnicki, John W.

doi:10.1029/2000jb900185

Cited by 240 publications

(186 citation statements)

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“…However, by extending the approach of ? and by reexamining the Rudnicki and Rice (1975) analysis, Issen and Rudnicki (2000) identified less restrictive conditions for compaction band formation. Although Rudnicki and Rice (1975) had identified this possibility, these solutions were not discussed because of their focus on low porosity, dilatant rocks.…”

Section: Introductionmentioning

confidence: 99%

“…Although Rudnicki and Rice (1975) had identified this possibility, these solutions were not discussed because of their focus on low porosity, dilatant rocks. By incorporating a correction to the original Rudnicki and Rice (1975) analysis, which was pointed out by Perrin and Leblond (1993), Issen and Rudnicki (2000) showed that compaction bands were the preferred non-uniform solution (compared with shear bands) for a range of ma-terial parameters that is representative of high porosity rock. This paper continues the analysis of Issen and Rudnicki (2000).…”

Section: Introductionmentioning

confidence: 99%

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Theory of compaction bands in porous rock

Issen

Rudnicki

2001

Physics and Chemistry of the Earth, Part A: Solid Earth and Geo

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Abstract. Compaction bands are narrow planar zones of localized purely compressive (without shear) deformation that form perpendicular to the most compressive principal stress. Such bands have been observed in high porosity rocks in the laboratory and in the field. Because compaction presumably decreases permeability, these bands can act as barriers to flow within reservoirs. Reexamination of the results of Rudnicki and Rice (J. Mech. Phys. Solids, 1975) for shear localization, with corrections by Perrin and Leblond (J. Appl. Mech., 1993), reveals that they admit solutions for compaction bands in a range of parameters that is representative of porous rock. Solutions for compaction bands are possible when the inelastic volume deformation is compactive and is associated with a "cap" on the yield surface. The expression for the critical hardening modulus (related to the slope of the shear stress vs. shear strain curve at constant mean stress) at which compaction bands are predicted to form differs from that for shear localization. For parameters representative of porous rock, axisymmetric compression is the most favorable deviatoric stress state for formation of compaction bands. Comparison of conditions for shear localization and compaction band formation suggests that either may occur depending on the stress path and magnitude of the confining stress.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Theory of compaction bands in porous rock

Issen

Rudnicki

2001

Physics and Chemistry of the Earth, Part A: Solid Earth and Geo

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“…Compaction localization was first predicted to occur by Rudnicki and Rice's [1975] strain localization theory, subsequently extended by Issen and Rudnicki [2000]. Among the main proposed collapse mechanisms are bond breakage [Nova et al, 2003], grain crushing [Mollema and Antonellini, 1996], pore collapse and pressure solution [Lajtai, 1974;Fletcher and Pollard, 1981;Olsson, 1999;De Meer et al, 2000].…”

Section: Introductionmentioning

confidence: 99%

Dynamical effects during compaction band formation affecting their spatial periodicity

Cecinato

Gajo

2014

JGR Solid Earth

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Compaction bands (CBs) are responsible for significant anisotropy alterations of permeability in geological materials; hence, understanding their formation conditions appears of key importance to all applications involving fluid extraction/injection from/into the ground. While most of the available models to understand CB formation are focused on interpreting the onset of a single CB, little effort has been so far dedicated to understand the documented periodicity of CBs. In this paper, the role of dynamical effects in inducing the post onset evolution of CBs is analyzed by means of a dedicated model for porous media with compressible constituents, with reference to a horizontal layer of sandy, water-saturated material. Elastic waves are generated as a first CB occurs due to sudden, localized volumetric collapse. If the waves are reflected at the interface with a softer material or with a previously formed CB, they produce significant local effective stress concentrations, which can promote the formation of further CBs in a cascade fashion, according to a regular geometric pattern. The spatial distribution of dynamically generated CBs, as well as the extent of the phenomenon, depends on the geometry of the domain and on the material's permeability. Sensitivity analysis is also performed to assess the key properties that promote dynamical CB in situ formation, identifying as the most influential conditions large stratum stiffness (increasing with depth) and the presence of softer layers. In contrast, the presence of less permeable and/or stiffer layers is not believed to play a major role in the proposed mechanism.

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“…Large-sized cavern is often located in an inhomogeneous medium because of complicated structure of the rock formation. Analysis of stability of such caverns should be made with account for specifics of the layered rock structure [1][2][3][4][5]. Also for the land surface subsidence prediction and risk analysis of buildings it is necessary to estimate deformation of the rock mass caused by the presence of underground karst caverns (see Fig.1, b).…”

Section: Introductionmentioning

confidence: 99%

Modified finite element analysis for exterior boundary problems in infinite medium

Chernysheva

Rozin

2016

MATEC Web of Conferences

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Abstract. Modified algorithm of the 3d finite element analysis developed for solution of external boundary problem is considered. The method in question is based on incorporating the FEM and Somigliana's integral formula. Efficiency of software implementations of the algorithm has been tested. A stress-strain analysis of inhomogeneous medium with a cavity has been carried out to display the approach.

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Conditions for compaction bands in porous rock

Abstract: Abstract.Reexamination

Cited by 240 publications

References 15 publications

Theory of compaction bands in porous rock

Theory of compaction bands in porous rock

Dynamical effects during compaction band formation affecting their spatial periodicity

Modified finite element analysis for exterior boundary problems in infinite medium

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