Velocity-displacement dependent friction coefficient and the kinematics of giant landslide
| Autor: | Wei-lun Yu, 余威論 |
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| Rok vydání: | 2011 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 99 To understand the characteristic of friction on sliding surface is one of the most important issues of giant landslide. The Tsaoling landslide occurred in 1999 and the Siaolin landslide occurred in 1999 are major objects in this study. It can be analyzed the movement course of landslide mass relative to the behavior of frictional mechanism when we use the high velocity rotary-shear test to construct the velocity-displacement dependent friction. There are complete records from the neighbor strong-earthquake station of surface vibration at the Tsaoling area and the possible impact signal from landslide mass during the Chi-Chi earthquake. And there are also the rich information that include the process of sliding and impacting from survivor in addition; hence, we collected the original samples near the sliding surface, and used the experimental results made by high velocity rotary-shear frictional testing apparatus to fit and construct the velocity-displacement dependant friction law, then, we introduced the law into the Newmark sliding block analysis to calculate variation of the mass in sliding acceleration, velocity, displacement and the friction coefficient with course. However, to compare with the records near the strong-earthquake station and the critical verifiable data from survivor, and it verify that the results of combining the friction law constructed by high velocity rotary-shear test and the displacement analysis with rigid body can reconstruct the course of sliding. The study demonstrates the friction coefficient of sliding surface obtains from high velocity rotary-shear test has obvious phenomenon of weakening; moreover, the kinetic energy achieves 4.8E+14 J before the impact, and the loss of energy from friction is the half of kinetic energy. In view of the relationship between the slip surface and the mass movement, we analyze the experimental results in Siaolin case; moreover, to observe the microstructure of the samples that have been done after the high velocity rotary-shear test, and trying to survey the mechanism of frictional weakening while the mass of giant landslide was sliding. Get an overview of the results from two cases; it appears that the phenomena of frictional weakening observed from the result of high velocity rotary-shear test can explain the mechanism for movement of the high velocity slip and large displacement clearly. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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