A Study of Stress-Flow Coupling Behavior of Porous materials
Date Issued
2011
Date
2011
Author(s)
Lee, Wan-Chin
Abstract
The permeability of earth materials and hydro-mechanic coupling behavior are important issue, the disastrous fluid in-rush into excavations, nuclear waste disposal, mining and petroleum industries, the seepage estimate of dam and the technology of carbon storage are involving the relation between stress and permeability of earth materials in civil engineering projects.
In this research, the effects of stress on the structure and permeability of earth materials are investigated through experimental characterizations and numerical simulations which is based on the discrete element method conducted with PFC2D using micro-mechanical parameters derived from physical testing to select appropriate micro-mechanical models and parameters. The first part of the paper summarizes the previous studies in this area, outlines such experimental method and depicts the steps of triaxial drained test and permeability test for the preparation of cemented granular. The following part discusses the results of physical tests and numerical compression.
The physical samples were prepared with aluminum particles and using kaolinite as cement. The results of experiment showed that the higher confine pressure, samples dilated more obviously during shearing, and the strength of sample of particles bonded with kaolinite is stronger than the one of only particles. In the complete stress-strain process, it was found the change of permeability was not constant, and it rised obviously around yielding. For the sample composed of only particles, the change of permeability was invariable. However, the numerical simulations and physical tests showed good correspondence in macroscopic behavior i.e. peak strength. But it has difference between the fluid analysis and the permeability of physical samples.
Subjects
distinct element method
permeability
hydro-mechanic coupling behavior
Type
thesis
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