Effect of particle size and shear speed on frictional instability in sheared granular materials during large shear displacement

Jiang, Yao; Wang, Gonghui; Kamai, Toshitaka; McSaveney, Mauri

doi:10.1016/j.enggeo.2016.06.005

Cited by 30 publications

(20 citation statements)

References 52 publications

(85 reference statements)

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“…Many processes are responsible for the generation of AEs in stressed geologic materials, and possible mechanisms have been reported [e.g., Lockner, 1993;Michlmayr et al, 2012]. For example, the coherent rupture of many asperities has been proposed as the source mechanism for AE events and mechanical failures on bare rock surfaces [e.g., Lockner, 1993;Kato et al, 1994;Yabe et al, 2003], and the abstract concept of force chains among sheared granular materials has recently been adopted to explain the mechanical behaviors observed in the laboratory conditions [e.g., Mair et al, 2002;Anthony and Marone, 2005;Jiang et al, 2016]. However, for sheared granular materials, the asperity model may not directly account for the complicated evolutions of grain contacts due to the many degrees of freedom in granular systems [e.g., Sammis and Steacy, 1994;Cates et al, 1998].…”

Section: Discussionmentioning

confidence: 99%

Acoustic emission signature of mechanical failure: Insights from ring‐shear friction experiments on granular materials

Jiang

Wang

Kamai

2017

Geophysical Research Letters

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The generation of acoustic emission (AE) in a material relates to the rapid energy release process, which delivers important information concerning the failure mechanism for stressed geologic materials. Here we report on ring‐shear friction experiments to investigate the mechanical behavior and AEs for sheared granular materials with different particle sizes under constant normal stress and a range of shear rates. Results show that the mechanical behavior of shear resistance, sample compaction and slip displacement, and the release of acoustic energy can be affected by both shear rate and particle size. The main AEs are strongly correlated with the global mechanical failure, and the maximum absolute amplitude of AEs generally increases with increase of the magnitude of stress drops. By analyzing the event sequences, it is found that the onset of AEs precedes the beginning of stress drop, which provides more useful information on the failure mechanisms of geologic granular materials.

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Section: Discussionmentioning

confidence: 99%

Acoustic emission signature of mechanical failure: Insights from ring‐shear friction experiments on granular materials

Jiang

Wang

Kamai

2017

Geophysical Research Letters

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“…It is a generally accepted fact that the measurement of the residual strength is most preferred done with a ring shear test since it allows the soil specimen be sheared at unlimited displacement which can simulate the field conditions more accurately (Lupini et al, 1981;Tiwari and Marui, 2005;Bhat, 2013;Sassa et al, 2004). Until now, several relationships between the residual strength and soil index parameters have been reported in the literature with a wide range of soil by using various kinds of ring shear apparatus (Hoyos et al, 2014;Jiang et al, 2016;Kimura et al, 2015;Li et al, 2013;. Furthermore, many studies have shown that the shearing rate may or may not affect the minimum value of soil strength at residual states (Suzuki et al, 2007;Grelle and Guadagno, 2010;Gonghui et al, 2010;Bhat, 2013;Tika and Hutchinson, 1999;Lemos, 1985;Morgenstern and Hungr, 1984;Tika, 1999).…”

Section: ． Introductionmentioning

confidence: 99%

Influence of shearing rate on the residual strength characteristic of three landslides soils in loess area

Lian

Peng

Wang

et al. 2018

Preprint

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Abstract. In order to investigate the effect of the shearing rate on the residual shear strength of slip zone soils, a series ring shear tests were carried out on slip zone soils from three landslides in loess area at the two shearing rates (0.1 mm/min and 1 mm/min). The slip zone soil specimens used in present study were from the northwest of China. Results indicated that the shear displacement to achieve the residual stage for specimens with higher shearing rate is greater than that of the lower rate. Relationship between the residual friction coefficients and normal stress shows that the residual friction coefficients for all specimens under the lower normal stress were greater than that under the higher normal stress at two shearing rate. Furthermore, the difference in the residual friction angle фr at the two shearing rates, фr (1) − фr (0.1), under each normal stress level were either positive or negative values, with the maximum absolute value of фr (1) − фr (0.1) reach up to 2.218°. However, the difference фr (1) − фr (0.1) under all normal stresses was negative, which indicates that the residual shear parameters reduced with the increasing of the shearing rate in loess area.

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“…The mechanical behavior of rock joints and fault systems in the presence of gouges depends highly on the morphology of the bounding surfaces, such as roughness 1,2 and also the characteristics of the filling material such as grain size, shape and mineralogy. [3][4][5] Roughness (as well as asperity geometry and structure in a more general sense) is key to be modeled in the analysis of tribological problems with applications from movements of large-scale geological structures to smaller-size grain-to-grain interactions of particulate matter. [6][7][8][9][10][11] Large-scale experiments (in terms of shearing displacement), mostly direct or double-direct shearing tests, have emphasized the influence of the said characteristics, alongside the rate of shearing, on the mechanical behavior of geological interfaces/structures.…”

Section: Introductionmentioning

confidence: 99%

“…[6][7][8][9][10][11] Large-scale experiments (in terms of shearing displacement), mostly direct or double-direct shearing tests, have emphasized the influence of the said characteristics, alongside the rate of shearing, on the mechanical behavior of geological interfaces/structures. [12][13][14][15][16][17][18] The occurrence of stick-slip instability/unstable slip in many geological structures can be observed in the events of shallow earthquakes and landslides, 4,19 which phenomenon is often replicated in large-scale laboratory experiments.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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Effect of particle size and shear speed on frictional instability in sheared granular materials during large shear displacement

Cited by 30 publications

References 52 publications

Acoustic emission signature of mechanical failure: Insights from ring‐shear friction experiments on granular materials

Acoustic emission signature of mechanical failure: Insights from ring‐shear friction experiments on granular materials

Influence of shearing rate on the residual strength characteristic of three landslides soils in loess area

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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