Brittle failure of rock: A review and general linear criterion

Labuz, Joseph F.; Zeng, Feitao; Makhnenko, Roman Y.; Li, Yuan

doi:10.1016/j.jsg.2018.04.007

Cited by 59 publications

(12 citation statements)

References 89 publications

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“…Reverse dip-slip and vertical strike-slip, dextro-and sinistral-normal faults correspond to dry brittle tectonic features linkable to shortening and extensional tectonic regime ( Fig. 7; Piquer et al 2016;Sato 2016;Liu et al 2017;Labuza et al 2018). These are corroborated by multiple σ 1 , σ 2 and σ 3 principal stress axes for multiple origins and certainly.…”

Section: Discussionmentioning

confidence: 73%

“…Tension gashes, tension fractures, and faults oriented NE-SW, NNE-SSW, ENE-WSW, and E-W (Figs 2, 7a, b). This indicates both their anachronism and complicated nature (Angelier 1994;Piquer et al 2016;Sato 2016;Liu et al 2017;Labuza et al 2018). Tension gashes represent last magmatic events emplaced under extensional regime contrarily to tension fractures.…”

Section: Discussionmentioning

confidence: 99%

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The petrostructural characteristics and 207Pb/206Pb zircon data from the Ngomedzap-Akongo area (Nyong complex, SW-Cameroon)

Owona¹,

Ondoa²,

Tichomirowa³

et al. 2020

Jour. Geosci.

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Herein, we constrain the Ngomedzap-Akongo geodynamic evolution in the eastern part of the Nyong complex (NyC) in SW Cameroon that belongs to the Paleoproterozoic West Central African Fold Belt (WCAF) through petrostructural field observations, laboratory analyses, and 207 Pb/ 206 Pb zircon geochronology. It consists of magnetite bearing quartzite, metagranodiorite, metaanorthosite, metagabbro, and metasyenites that have recorded a polyphase D 1-D 3 deformation. D 1 , likely a pure shear-type, has been strongly overprinted by the D 2 transpression flow regime that emplaced the Nyong tectonic nappe, transported top-to the East onto the Congo shield. This nappe is dissected by D 3 blastomylonitic shear-zones. Both the D 2 and D 3 have controlled the actual geometry of the Nyong belt, later crosscut by D 4 multiple brittle tectonic styles, likely post-orogenic. Zircon geochronology yielded 207 Pb/ 206 Pb zircon geochronology protolith Archean mean ages of 2764 ± 26 Ma (MSWD = 0.81) in metagranodiorite; 2816 ± 34 Ma (MSWD = 1.3) and 2789 ± 13 Ma (MSWD = 0.28) in metasyenites. These new data corroborate old ones and, together, document the Archean origin of the NyC as details of the Nyong fold-and-thrust belts that of WCAFB and South American homologous due to the colliding Congo-San Francisco shields associated with Eburnean/Trans Amazonian orogeny (~2100-2050 Ma).

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Section: Discussionmentioning

confidence: 73%

Section: Discussionmentioning

confidence: 99%

The petrostructural characteristics and 207Pb/206Pb zircon data from the Ngomedzap-Akongo area (Nyong complex, SW-Cameroon)

Owona¹,

Ondoa²,

Tichomirowa³

et al. 2020

Jour. Geosci.

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“…low confining pressure, and thus depth or with high fluid pressures), a non-linear failure envelope has been invoked to account for tensile and hybrid tensile/shear failure. One commonly used non-linear envelope is the parabolic Griffith criterion (Jaeger et al, 2007;Labuz et al, 2018):…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…Hoek-Brown (Jaeger et al, 2007;Labuz et al, 2018) for such mixtures could be explored in the future.…”

Section: Empirically Reconstructed Failure Envelopes and Theoretical mentioning

confidence: 99%

Mechanical properties of quartz sand and gypsum powder (plaster) mixtures: implications for laboratory model analogues for the Earth’s upper crust

Poppe¹,

Holohan²,

Rudolf³

et al. 2022

Preprint

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has been submitted in TECTONOPHYSICS. Please note that the manuscript has not undergone peer-review yet and has yet to be formally accepted for publication. Subsequent versions of this manuscript may have slightly different content. If accepted, the final version of this manuscript will be available via the 'Peer-reviewed publication DOI' link on the right-hand side of this webpage. Please feel free to contact the authors, we welcome feedback.

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“…The combination of irreversible thermodynamics and microscale physics places some constraints on the form of compaction relation (Yarushina & Podladchikov, 2015). It is well known that the short‐term response of most of the compacting porous rocks is elastoplastic (Fortin et al, 2007; Guéguen et al, 2004; Labuz et al, 2018; Makhnenko & Labuz, 2016), while, on a longer time scale, rocks also exhibit viscous properties (Brantut et al, 2013; Chang & Zoback, 2009; Hangx et al, 2010; Makhnenko & Podladchikov, 2018; Renner et al, 2001; Sabitova et al, 2019). Viscous deformation affects the performance of petroleum reservoirs, leading to wellbore stability issues, fault reactivation, and seafloor subsidence (Maranini & Brignoli, 1999).…”

Section: Introductionmentioning

confidence: 99%

Model for (De)Compaction and Porosity Waves in Porous Rocks Under Shear Stresses

2020

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An understanding of instantaneous and long‐term compaction of porous rocks is important for reservoir engineering and Earth sciences. Experience from laboratory triaxial compression tests and from subsurface operations indicates that shear and volumetric deformations are interdependent. Their mutual dependence results in shear‐enhanced compaction and shear‐induced dilation under short‐term and long‐term loading. Using a classical averaging approach, we consider the evolution of a single fluid‐filled pore in a solid elastoplastic or viscoplastic matrix under combined pressure and shear loading to introduce a new failure envelope and 3‐D constitutive relations for both rate‐dependent and rate‐independent deformation of porous rocks. Our model provides a simple description of rock behavior under a wide range of strain rates. The model predictions agree well with experimental data from triaxial instantaneous and creep tests. Analytical and numerical solutions for solitary porosity wave propagation in viscoplastic rocks in the presence of shear were obtained. New solutions show that new rheological laws have serious implications for porosity waves. Plasticity onset leads to compaction‐decompaction asymmetry and the formation of elongated channel‐like porosity waves. Shear‐induced dilation facilitates porosity wave propagation at fluid pressures below the lithostatic stress. This makes porosity waves a viable mechanism in the formation of focused fluid flow structures in crustal rocks.

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Brittle failure of rock: A review and general linear criterion

Cited by 59 publications

References 89 publications

The petrostructural characteristics and 207Pb/206Pb zircon data from the Ngomedzap-Akongo area (Nyong complex, SW-Cameroon)

The petrostructural characteristics and 207Pb/206Pb zircon data from the Ngomedzap-Akongo area (Nyong complex, SW-Cameroon)

Mechanical properties of quartz sand and gypsum powder (plaster) mixtures: implications for laboratory model analogues for the Earth’s upper crust

Model for (De)Compaction and Porosity Waves in Porous Rocks Under Shear Stresses

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