| Summary: | 碩士 === 國立中興大學 === 水土保持學系所 === 104 === Seepage erosion behavior is due to groundwater seepage force. Groundwater seepage force moves slope soil particles, and therefore slope failure occurs potentially. According to previous experimental results, we found soil particles flow out from the slope after groundwater seepage started. Flowing of soil particles caused soil scouring and cavitation occurred at slope toe. The slope soil particles on cavitation location collapsed because of the loss of support. To decrease slope failure problems due to soil seepage erosion, we need to learn more about soil seepage erosion behavior.
Simulation of soil seepage erosion behavior is mainly based on sandbox test. Although there are many researches about seepage erosion behavior, the results indicate that sandbox tests are usually affected by the model sizes and experimental situations. We use numerical methods to simulate experimental results and study the mechanism of seepage erosion.
In this study, we use PFC2D which is based on the discrete element method to simulate soil seepage erosion behavior. Particle flow is a continuous process, which is an advantage to simulating soil seepage erosion behavior with groundwater seepage force. Our results successfully simulate sandbox tests and show that the process of soil seepage erosion completely. It offers a new method which is easier and cheaper to simulate soil seepage erosion behavior and complete process and results.
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