On the morphology and pressure-filtration characteristics of filter cake formation: insight from coupled CFD–DEM simulations

Yin, T., Zhang, Z., Huang, X., Shire, T. and Hanley, K. J. (2021) On the morphology and pressure-filtration characteristics of filter cake formation: insight from coupled CFD–DEM simulations. Tunnelling and Underground Space Technology, 111, 103856. (doi: 10.1016/j.tust.2021.103856)

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Abstract

The slurry filtration process at a tunnel face plays an important role in supporting pressure transmission, which is crucial to the stability of a tunnel face during shield tunneling. In this paper, a series of coupled computational fluid dynamics (CFD)–discrete element method (DEM) numerical simulations were carried out to model the slurry filtration column test. A simplified JKR (Johnson-Kendall-Roberts) model was used to simulate the cohesion between slurry particles. Four types of filter cake formation were identified under different combinations of size ratios between slurry and sand particles, and cohesion between slurry particles according to morphology and pore pressure distribution characteristics. These types were external filter cake, external & internal filter cake, internal filter cake & deep penetration and external & internal filter cake & deep penetration. The contact-based analysis of the constriction (void throat) sizes reveals that the dynamic evolution of the pore structure is closely related to the slurry infiltration process, i.e., the infiltration of slurry particles tends to seal the infiltration channel, which prevents infiltration of any more particles. The variation of Dc50 (the median constriction size) is closely related to the infiltration state of the slurry particles. The pressure drop within the filter cake becomes significant, i.e., the filter cake will become effective, only when the ratio of Dc50 to the size of slurry particles is below a threshold value. The current study provides new insight into the fundamental mechanism underlying the slurry filtration process during shield tunneling.

Item Type:Articles
Additional Information:The research was supported by the National Natural Science Foundation of China [grant number 41877227 & 51509186].
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Shire, Dr Thomas
Creator Roles:
Shire, T.Writing – review and editing
Authors: Yin, T., Zhang, Z., Huang, X., Shire, T., and Hanley, K. J.
College/School:College of Science and Engineering > School of Engineering > Infrastructure and Environment
Journal Name:Tunnelling and Underground Space Technology
Publisher:Elsevier
ISSN:0886-7798
ISSN (Online):1878-4364
Published Online:10 February 2021
Copyright Holders:Copyright © 2021 Elsevier Ltd.
First Published:First published in Tunnelling and Underground Space Technology 111: 103856
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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