Chemical reaction capping of thermal instabilities during shear of frictional faults

Veveakis, Manolis; Alevizos, Sotiris; Vardoulakis, I.

doi:10.1016/j.jmps.2010.06.010

Cited by 72 publications

(84 citation statements)

References 63 publications

(52 reference statements)

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“…3(b)). Since usually T p %T c , as temperature increases due to shear heating, the shear band would shrink in a thermally controlled process (see also Veveakis et al (2007Veveakis et al ( , 2010). …”

Section: Shear Band Thicknessmentioning

confidence: 99%

Failure in shear bands for granular materials: thermo-hydro-chemo-mechanical effects

Veveakis

Stefanou

Sulem

2013

Géotechnique Letters

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The failure of geomaterials in localised shear bands is one of the most common features in geomechanics. Early studies have provided the necessary criteria for the conditions of localisation, inclination angle with respect to the loading axes and thickness of the shear bands, when loaded at room temperature. This work extends these criteria for the problem of simple shear of a chemically active granular cohesionless material at higher temperatures, where thermal or chemical pressurisation may set in and influence the response of the material. It is deduced that failure occurs at higher positive values of the hardening modulus as temperature increases, that the shear band thickness also depends on the chemical reaction characteristics and that micro-inertia due to grain translations and rotations introduce the necessary rate dependency to regularise the system.

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Section: Shear Band Thicknessmentioning

confidence: 99%

Failure in shear bands for granular materials: thermo-hydro-chemo-mechanical effects

Veveakis

Stefanou

Sulem

2013

Géotechnique Letters

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“…In the present work, we follow a Continuum Mechanics approach that was previously presented in [8,11] for modelling a fault in creeping flow conditions, including multiphysics processes explained below. Therefore, we assume that all the deformation occurs in an infinite shear zone of thickness d (Figure 1).…”

Section: Problem Formulation-previous Workmentioning

confidence: 99%

“…The notation τ * m refers to the MacKauley brackets typically used in plasticity modelling. The behaviour of this law is equivalent to the Arrhenius-type rate and state law presented in [11]. By only considering the effect of shear heating in the material behaviour χ > 0, there is a material instability at a critical amount of shear heating χσ ij˙ ij , where a stable creep branch can turn into a thermal runaway.…”

Section: Problem Formulation-previous Workmentioning

confidence: 99%

“…It was found that inclusion of Arrhenius temperature-dependency alone is not enough to stabilize the system for real-case scenarios, as the upper branch stabilizes at a prohibitively high temperature; hence, an arbitrary temperature cutoff was introduced to stabilize the numerical solutions [17]. The explicit inclusion of a phase change mechanism, like melting of the material or an endothermic chemical reaction, [11] solves this problem, as the cutoff is effectively achieved by an energy sink. In this contribution, we use the essential form of this instability mechanism by extending it to include chemical reactions.…”

Section: Problem Formulation-previous Workmentioning

confidence: 99%

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Analysis of Dynamics in Multiphysics Modelling of Active Faults

et al. 2016

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Instabilities in Geomechanics appear on multiple scales involving multiple physical processes. They appear often as planar features of localised deformation (faults), which can be relatively stable creep or display rich dynamics, sometimes culminating in earthquakes. To study those features, we propose a fundamental physics-based approach that overcomes the current limitations of statistical rule-based methods and allows a physical understanding of the nucleation and temporal evolution of such faults. In particular, we formulate the coupling between temperature and pressure evolution in the faults through their multiphysics energetic process(es). We analyse their multiple steady states using numerical continuation methods and characterise their transient dynamics by studying the time-dependent problem near the critical Hopf points. We find that the global system can be characterised by a homoclinic bifurcation that depends on the two main dimensionless groups of the underlying physical system. The Gruntfest number determines the onset of the localisation phenomenon, while the dynamics are mainly controlled by the Lewis number, which is the ratio of energy diffusion over mass diffusion. Here, we show that the Lewis number is the critical parameter for dynamics of the system as it controls the time evolution of the system for a given energy supply (Gruntfest number).

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“…As a result, the Terzaghi effective normal stress (Skempton 1960) and thus the Coulomb frictional stress will decrease accordingly, leading to a fault slip. This process is referred to as thermopressurization weakening (TPW) mechanism, which has also been operated in the research of large terrestrial landslides (Voight and Faust 1982;Davis et al 1990;Vardoulakis 2000Vardoulakis , 2002Aharonov 2007, 2009;Veveakis et al 2007Veveakis et al , 2010Alevizos et al 2010). In theory, the TPW mechanism acts as an "accelerator" that can speed up the movements of landslides, whereas the shear dilatancy mostly can behave as a "brake" to decelerate landslide movements (Iverson et al 2000;Iverson 2005).…”

Section: Introductionmentioning

confidence: 99%

Frictional heating lubrication for submarine landslide

Chen¹,

Yang²,

Hwung³

2018

Terr. Atmos. Ocean. Sci.

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Given a large block of fine-grained sediment that overlies a 1° continental slope, if the entire sediment deposit is shaken by an earthquake to slide down the slope with an initial velocity (referred to as "submarine landslide" hereinafter), our block model showed that the whole deposit can continuously slide downslope with the "help" of basal frictional heating. In theory, basal Coulomb friction can generate a thermal internal energy in the basal shear zone of landslides (called "frictional heating"), the increasing temperature activating two mechanisms. One mainly decreases the Terzaghi effective normal stress of the landslides and the other decreases the Coulomb friction coefficient. Combining these two mechanisms can effectively decrease the basal frictional resistance of the landslides increasing the mobility of the landslides on gentle slopes (entitled as "frictional heating lubrication"). As shown in our calculations, frictional heating increases with the increase of the initial downslope velocity but decreases with the increase of the shear zone thickness.

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Chemical reaction capping of thermal instabilities during shear of frictional faults

Cited by 72 publications

References 63 publications

Failure in shear bands for granular materials: thermo-hydro-chemo-mechanical effects

Failure in shear bands for granular materials: thermo-hydro-chemo-mechanical effects

Analysis of Dynamics in Multiphysics Modelling of Active Faults

Frictional heating lubrication for submarine landslide

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