Experimental simulation of spiral slip lines on granular materials

Bobryakov, A. P.; Ревуженко, А. Ф.

doi:10.1007/s10913-009-0013-x

Cited by 7 publications

(4 citation statements)

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“…It would be interesting to study this phenomenon in more detail in light of the predictions made here. Our results also suggest a new quantitative interpretation of the shearing experiment in [26].…”

Section: Conclusion and Discussionsupporting

confidence: 60%

“…Back-bending forces have also been observed, as figure 2 shows. Another intriguing and potentially related experimental observation has been reported in [15]. The experiments consisted of shearing sand-filled Couette cells by a very slowly rotating inner boundary and observing formation of patterns of Mandala-like slip lines in the medium.…”

Section: Experimental Supportmentioning

confidence: 86%

mentioning

confidence: 98%

“…Fig.6The σ rθ -chain solutions (left) for the fabric tensor measured from figure4of[15]. For a clear comparison with the experimentally observed Mandala-like slip lines (centre, courtesy of Bobryakov and Revuzhenko[15]), only ten chain pairs are shown. The rotation in the experiment breaks the left-right symmetry and gives slight preference to one family of characteristics over the other (right).…”

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confidence: 98%

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Bending back stress chains and unique behaviour of granular matter in cylindrical geometries

Blumenfeld

2017

Granular Matter

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We analyse the general solutions for the stress field in planar annuli of isostatic media, a model often used for marginally rigid granular materials in Couette cells. We demonstrate that these solutions are much richer than in rectangular symmetries. Even for uniform media, stress chains are found to curve, broaden away from the stress source, attenuate and leak stress into a cone of influence. Most spectacularly, stress chains may bend back and transmit forces oppositely to the original direction. None of these phenomena arises in solutions for uniform media in Cartesian coordinates. We further analyse non-uniform media, which exhibit chain branching and stress leakage from the chains. These results are directly relevant to the many experiments on granular materials, carried out in Couette cells. They also shed light on, and are supported by, hitherto unexplained experimental observations of curved and back-bending chains, which we point out. In particular, we use our results to provide a new interpretation for the pattern of slip lines observed experimentally.

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Section: Conclusion and Discussionsupporting

confidence: 60%

Section: Experimental Supportmentioning

confidence: 86%

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confidence: 98%

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confidence: 98%

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Bending back stress chains and unique behaviour of granular matter in cylindrical geometries

Blumenfeld

2017

Granular Matter

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An experimental investigation on the effect of grain size on oil-well sand production

2012

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Sand production in oil wells is closely related to the mechanical behavior and petrographical properties of sandstones reservoir. Grain size is one of the main parameters controlling the phenomenon, which is studied in this paper. Large-scale hollow cylindrical synthetic samples with the same rock strength but different grain sizes were tested by an experimental setup in the laboratory. Different external grain size (D 50 <0.3 mm), the required confining stress for different sanding levels decreased with an increase in the grain size and for the samples with the coarser grains (D 50 stress for different sanding levels dramatically increased with an increase in the grain size. Those two second was bigger chunks in the slab form. In samples with large grains, plastic zones around hole were changed to a completely loose zone including interlocked individual grains or cluster of grains. In these samples after breakage of these interlocked zones sand was produced in the form of individual grains and clusters. Contrary to this, for samples with smaller grain size, shear bands were formed around the

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Strain Localization in Energetic and Inert Granular Materials

Walley¹

2012

Adiabatic Shear Localization

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Experimental simulation of spiral slip lines on granular materials

Cited by 7 publications

References 2 publications

Bending back stress chains and unique behaviour of granular matter in cylindrical geometries

Bending back stress chains and unique behaviour of granular matter in cylindrical geometries

An experimental investigation on the effect of grain size on oil-well sand production

Strain Localization in Energetic and Inert Granular Materials

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