An experimental investigation of the microslip displacement of geological materials

Sandeep, C.S.; Senetakis, Kostas

doi:10.1016/j.compgeo.2018.11.013

Cited by 60 publications

(35 citation statements)

References 64 publications

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“…They proposed that this gradual development of sliding at the contact surface contributes to the nonlinearity in the tangential force against displacement relationship. It was observed that the tangential force to reach the steady state or slip displacement (where the slip displacement is defined at the onset of zeroed tangential stiffness) increased with the increase in the applied normal force for both materials, which is in agreement with the recent study by Sandeep and Senetakis (). Figure shows representative tangential stiffness degradation curves.…”

Section: Resultssupporting

confidence: 91%

“…The theoretical curve as shown in Figure revealed a wide gap between MD model and the experimental tangential curves for both material types. Previous works (Nardelli et al, ; Sandeep, He, et al, ; Sandeep & Senetakis, , ) reported, similarly, mismatch between MD model and experimental results on a broad range of geological materials, when the MD model is used with its originally proposed power of 1/3 (equation ). They also reported that differences between MD model and experimental curve can be reduced to some extent by considering initial tangential stiffness derived from experiment rather than from equation .…”

Section: Resultsmentioning

confidence: 81%

“…These parameters also affect the contact area. Additionally, earlier works (Biegel et al, ; Dieterich, ; Linker & Dieterich, ; Sandeep & Senetakis, , ; Sandeep, Todisco, et al, ) showed that the slip displacement increases with the increase in the applied normal force and surface roughness so that the high roughness of the DNA‐1A simulant seems to have contributed to these observed trends.…”

Section: Resultsmentioning

confidence: 83%

“…Figure shows representative cyclic shearing tests conducted on DNA‐1A and Ottawa sand pairs of grains at displacement amplitude of 5 μm. The energy loss percentage (Δ E ) is calculated based on equation , similar to Sandeep and Senetakis (, ) from the area of the closed loop (Δ L ) over the elastic energy stored ( L ) from the first part of force displacement prior to reversal of the force (it corresponds to a triangle area). The results from the cyclic tests in terms of energy loss percentage calculated in the second cycle of the experiments are summarized in Table .…”

Section: Resultsmentioning

confidence: 99%

“…The parameters obtained through micromechanical tests at the grain scale (for example, interparticle friction, normal and tangential stiffness) comprise important input in numerical simulations using DEM analyses, for example, in the analysis of the macroscale response of granular materials subjected to monotonic or cyclic loading and the flowability behavior of granular materials (Huang et al, ; Iverson et al, ; Sazzad & Suzuki, ; Yan et al, ). Based on this, significant advancements took place in recent years in microscale experimentation investigating the contact behavior of geological materials and lunar regolith simulants (e.g., Cavarretta et al, ; Cole, ; Cole & Peters, ; Nardelli et al, ; Nardelli & Coop, ; Sandeep & Senetakis, , , ; Senetakis et al, , ; Senetakis & Coop, ). It is highlighted, based on the studies by Sandeep and Senetakis (, ), that the mesoscale morphology of the grains and the previous loading history affect, markedly, the interparticle load‐displacement relationship and coefficient of friction.…”

Section: Introductionmentioning

confidence: 99%

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Micromechanical Behavior of DNA‐1A Lunar Regolith Simulant in Comparison to Ottawa Sand

et al. 2019

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In this study, the micromechanical interparticle contact behavior of “De NoArtri” (DNA‐1A) grains is investigated, which is a lunar regolith simulant, using a custom‐built micromechanical loading apparatus, and the results on the DNA‐1A are compared with Ottawa sand which is a standard quartz soil. Material characterization is performed through several techniques. Based on microhardness intender and surface profiler analyses, it was found that the DNA‐1A grains had lower values of hardness and higher values of surface roughness compared to Ottawa sand grains. In normal contact micromechanical tests, the results showed that the DNA‐1A had softer behavior compared with Ottawa sand grains and that cumulative plastic displacements were observed for the DNA‐1A simulant during cyclic compression, whereas for Ottawa sand grains elastic displacements were dominant in the cyclic sequences. In tangential contact micromechanical tests, it was shown that the interparticle friction values of DNA‐1A were much greater than that of Ottawa sand grains, which was attributed to the softer contact response and greater roughness of the DNA‐1A grains. Widely used theoretical models both in normal and tangential directions were fitted to the experimental data to obtain representative parameters, which can be useful as input in numerical analyses which use the discrete element method.

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Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 81%

Section: Resultsmentioning

confidence: 83%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Micromechanical Behavior of DNA‐1A Lunar Regolith Simulant in Comparison to Ottawa Sand

et al. 2019

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DEM analyses of cemented granular fault gouges at the onset of seismic sliding: peak strength, development of shear zones and kinematics

Casas

Mollon

Daouadji

2021

Preprint

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Fault zones usually present a granular gouge, com-ing from the wear material of previous slips. This layer contributes to friction stability and plays a key role in the way elastic energy is released during sliding. Considering a mature fault gouge with a varying amount of mineral cementation between particles, we aim to understand the influence of the strength of interparticle bonds on slip mechanisms by employing the discrete element method. We consider a direct shear model without fluid in 2D, based on a granular sample with angular and faceted grain shapes. Focusing on the physics of shear accommodation inside the granular gouge, we explore the effect of an increase of cementation on effective fric-tion (i.e. stress ratio) within the fault. We find that brittleness and the overall shear strength are enhanced with cementation, espe-cially for dense materials. For the investigated data range, three types of cemented material are highlighted: a poorly cemented material (Couette flow profile, no cohesion), a cemented material with aggregates of cemented particles changing the granular flow and acting on slip weakening mechanisms (Riedel shear bands R), and a highly-cemented material behaving as a brittle material (with several Riedel bands followed by fault-parallel shear-localization Y). Effective friction curves present double weakening shapes for dense samples with enough cementation. We find that the effective friction of a cemented fault cannot be directly predicted from Mohr-Coulomb criteria because of the heterogeneity of the stress state and kinematic constraints of the fault zone.

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Micromechanical‐based experimental and analytical studies on rate effects and stick‐slip instability of smooth quartz surfaces in the presence of plastic and non‐plastic gouges

Kasyap

Senetakis

2020

Num Anal Meth Geomechanics

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We examined with micromechanical-based experiments the influence of shearing rate on the tangential contact behavior of smooth (very low surface roughness) flat quartz surfaces with montmorillonite and crushed aggregates as gouges. On decreasing the shearing rate by one order of magnitude, significant changes in the stick-slip instability were observed; increase in force-drop, recurrence interval and slip velocity. The initial tangential stiffness increased on decreasing the shearing rate. The type of gouge particles also influenced the behavior of the interfaces; for example, higher friction and stable sliding were observed for angular particles (non-plastic gouge) compared to flaky particles (plastic gouge). The partition of the tangential force-displacement relationship based on the shape of the curve was also dependent on the shearing rate. On a qualitative standpoint, the results presented in this micromechanicalbased study were in agreement with macro-scale test results published in the literature, although different scale tests were also performed in the present work, from grain-level to direct shear test size. The changes in the behavior of stick and slip components of the tangential force and the contact area with shearing rate were analytically studied, and the corresponding variations in the normal load-displacement relationship were also discussed. This experimental micromechanical-based study with additional analytical support, provides a preliminary understanding of the frictional behavior of different gouges under shearing rates of one folder difference and also provides insights into the stickslip instability behavior at a microscopic (grain-scale) standpoint.

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An experimental investigation of the microslip displacement of geological materials

Cited by 60 publications

References 64 publications

Micromechanical Behavior of DNA‐1A Lunar Regolith Simulant in Comparison to Ottawa Sand

Micromechanical Behavior of DNA‐1A Lunar Regolith Simulant in Comparison to Ottawa Sand

DEM analyses of cemented granular fault gouges at the onset of seismic sliding: peak strength, development of shear zones and kinematics

Micromechanical‐based experimental and analytical studies on rate effects and stick‐slip instability of smooth quartz surfaces in the presence of plastic and non‐plastic gouges

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