| Summary: | 碩士 === 國立臺灣大學 === 土木工程學研究所 === 100 === Seepage is one of the major concerns in geotechnical engineering. The permeability adopted in engineering design usually applies a fixed value in entire area. However, the physical properties of geotechnical material may vary due to different external loading. For example, the variations of strain and porosity induce the different permeability. This interaction phenomenon is known as hydraulic-mechanical coupling behavior. It is worth to study geotechnical materials under stress condition, how to affect the materials structure and permeability.
Based on a wide range of geotechnical materials, this study explores the hydraulic-mechanical coupling behavior of granular material. The software PFC3D based on distinct element method is used to simulate the stress-strain-flow relationship.
In order to get the micro parameters of numerical model, this model is first verified by experimental triaxial compaction drainage test. The numerical model is composed of two kinds of particles, represented the aluminum balls and membrane, respectively. Then, the triaxial permeability test is simulated to explore the variation of permeability subject to different stress conditions. The results show that the permeability will increase as the stress arise. However, some error exists between the experimental and simulated results.
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