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Dynamics of irregular particles in the passive layer under the slumping regime

Lookup NU author(s): Dr Vladimir Zivkovic

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Abstract

Previous study of our group showed that the compaction of sand particles is observed before while dilatancy occurs during avalanches in the active layer (es. Chen et al., Sci Sin Phys Mech Astron 49(6), 2019). In current works, we investigated the dynamic of irregular particles in the passive layer by speckle visibility spectroscopy, discovering two types of cycle rearrangements. We determine that one kind of rearrangement corresponds to the compaction of the pre-avalanche granular bed, and the other rearrangement is triggered by granular avalanches occurring in the active layer. The rearrangement caused by avalanche has a greater dissipation energy by comparing the other rearrangement. We describe simple mechanisms which account for the non-uniformity of dissipated energy. We further found that the propagation speeds of the rearrangements in the passive layer are an order of magnitude faster than that in the active layer and the propagation directions for both rearrangements are opposite to each other.

Publication metadata

Author(s): Chen Q, Li R, Xiu WZ, Zheng G, Zivkovic V, Yang H

Publication type: Article

Publication status: Published

Journal: Powder Technology

Year: 2020

Volume: 372

Pages: 32-39

Print publication date: 15/07/2020

Online publication date: 29/05/2020

Acceptance date: 24/05/2020

Date deposited: 09/06/2020

ISSN (print): 0032-5910

ISSN (electronic): 1873-328X

Publisher: Elsevier

URL: https://doi.org/10.1016/j.powtec.2020.05.089

DOI: 10.1016/j.powtec.2020.05.089

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