期刊
INTERNATIONAL JOURNAL OF GEOMECHANICS
卷 21, 期 5, 页码 -出版社
ASCE-AMER SOC CIVIL ENGINEERS
DOI: 10.1061/(ASCE)GM.1943-5622.0001997
关键词
Fluidization; Fluid-particle interaction; LBM-DEM coupling; Critical hydraulic gradient; Microscopic properties
资金
- Australian government through the Australian Research Council [LP160101254]
- Industrial Transformation Training Centre for Advanced Technologies in Rail Track Infrastructure (ITTC), University of Wollongong
- SMEC
- Coffey
- GeoHarbour-Australia
- ARTC (Australian Rail Track Corporation)
This paper introduces a novel numerical approach to capture the microscopic properties of soil under increasing hydraulic gradient, utilizing a combination of DEM and LBM to constantly update particle and fluid variables. Experimental validation shows that this method can reasonably predict the coupled hydraulic and soil fluidization aspects.
The loss of effective stress due to increasing excess pore pressure that results in the upward migration of soil particles, that is, subgrade fluidization and mud pumping, has been a critical issue for railways over many years. Traditional methods such as experimental and analytical approaches can capture macroscopic quantities such as the hydraulic conductivity and critical hydraulic gradient, but they have many limitations when microscopic and localized behavior must be captured. This paper, therefore, presents a novel numerical approach where the microscopic properties of fluid and particles can be better captured when the soil is subjected to an increasing hydraulic gradient. While particle behavior is simulated using the discrete element method (DEM), the fluid dynamics can be described in greater detail using the lattice Boltzmann method (LBM). The mutual LBM-DEM interaction is carried out, so the particle and fluid variables are constantly updated. To validate this numerical method, laboratory testing on a selected subgrade soil is conducted. The results show that the numerical method can reasonably predict the coupled hydraulic and soil fluidization aspects, in relation to the experimental data. Microscopic properties such as the interstitial fluid flowing through the porous spaces of the soil are also captured well by the proposed fluid-particle coupling approach.
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