eprintid: 10192058
rev_number: 6
eprint_status: archive
userid: 699
dir: disk0/10/19/20/58
datestamp: 2024-05-14 14:54:22
lastmod: 2024-05-14 14:54:22
status_changed: 2024-05-14 14:54:22
type: article
metadata_visibility: show
sword_depositor: 699
creators_name: Liang, Luju
creators_name: Cheng, Yi Pik
creators_name: Fan, Xiaozhen
creators_name: Ding, Zhi
creators_name: Xu, Changjie
title: Multi-Scale Research on the Mechanisms of Soil Arching Development and Degradation in Granular Materials with Different Relative Density
ispublished: pub
divisions: UCL
divisions: B04
divisions: C05
divisions: F44
keywords: Soil arching; discrete element modeling; persistent homology; multi-scale analysis; relative density
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abstract: Soil arching is significantly influenced by relative density, while its mechanisms have barely been analyzed. A series of DEM numerical simulations of the classical trapdoor test were carried out to investigate the multi-scale mechanisms of arching development and degradation in granular materials with different relative density. For analysis, the granular assembly was divided into three zones according to the particle vertical displacement normalized by the trapdoor displacement δ. The results show that before the maximum arching state (corresponding to the minimum arching ratio), contact forces between particles in a specific zone (where the vertical displacement of particles is larger than 0.1δ but less than 0.9δ) increase rapidly and robust arched force chains with large particle contact forces are generated. The variation in contact forces and force chains becomes more obvious as the sample porosity decreases. As a result, soil arching generated in a denser particle assembly is stronger, and the minimum value of the arching ratio is increased with the sample porosity. After the maximum arching state, the force chains in this zone are degenerated gradually, leading to a decrease in particle contact forces in microscale and an increase in the arching ratio in macroscale. The recovery of the arching ratio after the minimum value is also more significant in simulations with a larger relative density, as the degeneration of contact force chains is more obvious in denser samples. These results indicate the importance of contact force chain stabilities in specific zones for improving soil arching in engineering practice.
date: 2024-04-24
date_type: published
publisher: MDPI AG
official_url: http://dx.doi.org/10.3390/fractalfract8050247
oa_status: green
full_text_type: pub
language: eng
primo: open
primo_central: open_green
verified: verified_manual
elements_id: 2273511
doi: 10.3390/fractalfract8050247
lyricists_name: Cheng, Yi
lyricists_id: YPCHE61
actors_name: Flynn, Bernadette
actors_id: BFFLY94
actors_role: owner
full_text_status: public
publication: Fractal and Fractional
volume: 8
number: 5
pagerange: 247-247
citation:        Liang, Luju;    Cheng, Yi Pik;    Fan, Xiaozhen;    Ding, Zhi;    Xu, Changjie;      (2024)    Multi-Scale Research on the Mechanisms of Soil Arching Development and Degradation in Granular Materials with Different Relative Density.                   Fractal and Fractional , 8  (5)   p. 247.    10.3390/fractalfract8050247 <https://doi.org/10.3390/fractalfract8050247>.       Green open access   
 
document_url: https://discovery.ucl.ac.uk/id/eprint/10192058/1/fractalfract-08-00247.pdf