| Summary: | 碩士 === 國立中興大學 === 水土保持學系所 === 100 === The flow and deposition behavior of geomaterials are studied using the software PFC2D of the discrete element method and FLO-2D based on the continuum mechanics theory.
The flume tests are used as a small-scale model. The both numerical models are used to simulate a real flume test. The PB design is used to study the relative influence of the parameters on the deposition behavior. For PFC2D, the important parameters are particle stiffness, particle friction and viscous damping, while for FLO-2D, they are yield stress and viscosity.
The correlation of the parameters between the two numerical models are studied. The parameters of both the models that yield similar travel distance are collected for canonical correlation analysis through statistical software R. A canonical correlation coefficient 0.9517 is obtained. Its P-value is 6.65e-9, which is less than 0.05. It shows that the parameters of both models have high correlation with each other. And then, the relationships between the parameters of both models are established by multivariate regression analysis.
Finally, the Fengqiu landslide is used as a large-scale model to test the prediction of the regression equations. The properties of geomaterials which were obtained from field investigation are transformed into the micro-parameters of PFC2D appropriately. The micro-parameters determined could represent the mechanical properties of geomaterials in the field. The particle friction is reduced to cause slope failure and has the travel distance in the event. The travel distance is simulated by FLO-2D with the yield stress and viscosity predicted by the micro-parameters of PFC2D through the regression equations.
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