| Summary: | 碩士 === 國立臺北科技大學 === 土木與防災研究所 === 97 === Gravel indentation and its induced astral/radial extensional cracks have been considered may link to tectonic activity. The junction axis of the cracking surface is been proposed parallel to the global maximum tectonic principal stress, however, this hypothesis not yet been revivified or been proved, so far. In this study, base on the numerical discrete granular particle analysis, we try to explore the overall body stress - strain relationship. On the other hand, the analysis of particle contact behavior variation may help to understand the conglomerate deformation behavior.
In this study, by using discrete element method, PFC2D, the granular contact behavior are been analysis in terms of stress, strain and the direction of contact direction variations… etc. Base on the biaxial compression tests the analysis of rose diagram, stress state, strain state have been compared. This study pointed out that the magnitude of confining pressure, friction coefficient, particle stiffness and bond strength, etc. both internal and external conditions will affect both the form of rose diagram and its subsequent evolution.
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