Dynamic Test of Model Slope Using Small Shaker
Date Issued
2005
Date
2005
Author(s)
Wang, Yuan-Tu
DOI
zh-TW
Abstract
The Chi-Chi earthquake struck the central Taiwan on September 21, 1999 and resulted in severe landslide hazard. In order to understand the dynamic slope behavior, Meei-Ling Lin and Kuo-Lung Wang(2005) conducted “large- scale model slope shaking table test” in National Center for Research on Earthquake Engineering since 2003. However, the large scale test is time consuming and difficult to prepare simple. Therefore, the small shaking table was developed to simulate the large scale test and to perform qualitatively preliminary researches to lower the risk of large scale test. The small shaking table test is supplementary test to the large scale test.
The Vietnam sand was used in this research, its dynamic characters, including shear wave velocity, maximum shear modulus, and the relationships of shear modulus and damping ratio versus shear strain were determined. Model slope test using small shaker were executed to simulate and observe the dynamic behavior of slope. Finally, the test results were verified and compared with results of prototype using FLAC, STABL, and similitude law proposed by Meymand(1998).
The result indicates that the small shaker which generated simple harmonic vibration with frequency 7Hz and acceleration amplitude of 0.2g induced circular shallow failure of model slope. The slope failure of model slope with lower relative density, about 40%, than the model slope with higher relative density, and with about 70%, occurred earlier, within shorter duration, larger slip volume and faster slipping rate, and resulting more change in shape. The constraint of model box boundaries becomes more significant while samples’ relative density increased.
The FLAC program used in this study appeared to be able to effectively analyze small-scale model slope. The critical acceleration computed using STABL in the pseudo-static is consistent with the model slope failure condition. The similitude law by Meymand appeared to satisfy the similarity between model and prototype in shear strain, however, due to the limitation in scaling of shear wave velocity and shear modulus, error was introduced.
Subjects
模型邊坡
振動台
動態行為
相似律
反應分析
model slope
shaking table
dynamic behavior
law of similarity
response analysis
Type
thesis
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