Analyses of the Seismic signals and Self-potential from an erosion test of a dam model and slope model
| Autor: | Lu-Jian Zhong, 鐘履鍵 |
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| Rok vydání: | 2018 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 106 The model was built in the creek at Huisun Forest Area, Nantou County. This study a dam model of average height 4 m and a slope model of height 3 m for a dam erosion test. The process of investigation totally 3 times in September 22, 2017, November 02, 2017and April 26, 2018. Our goal is investigate the vibration frequency of collapsing and decide the time of collapsed and flood flushed. This study installed accelerometers on top of the dam and slope and downstream riparian and non-polarized electrodes to detect the seismic signals and the variation of the self-potentials of the dam and slope. The seismic signals were analyzed by the Hilbert-Huang Transform method to obtain the time-frequency spectra and the curves of the spectral magnitudes versus time. The water level scale is defined on the model this study set, and we observe the flood process by the camera. This study identified when the collapsing/sliding events occurred and the range of the vibrational frequency. The erosion processes of the dam and slope can be corresponded to the curves of the spectral magnitude too. From the self-potential results, this study found that the self-potential value increased when the water level reached the positions of the non-polarized electrodes. When an electrode displacement occurs, the natural potential drops. The variation in natural potential can correspond to the impoundment of the model dam to the collapse process. This study also found the model slope procession that the natural potential corresponded the slope collapsed by flood erosion. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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