Shaking Table Tests on Large Saturated Mailiao Sand Specimens
Date Issued
2007
Date
2007
Author(s)
Chen, Yi-Cheng
DOI
zh-TW
Abstract
Mailiao silty sand is a typical soil of the reclaimed lands in the western coastal area in Taiwan. Shaking table tests with various acceleration amplitudes, frequencies, durations, and shaking directions were performed on the saturated Mailiao silty sand inside the large laminar shear box at National Center for Research on Earthquake Engineering (NCREE). The test results were compared with those obtained in the previous shaking table tests on Vietnam clean sand.
After sample preparation of Mailiao sand, the results of P-wave velocity measurement confirmed the saturation of the sand specimen. The dry density and fines content obtained by thin-walled tube sampling showed no significant difference within the sand specimen, except a thin layer of high-fines-content sand on the top of the sand specimen.
According to the measurements by the mini-piezometers, the pore water pressure dissipation of Mailiao silty sand is about 15 times longer than that of Vietnam clean sand. The permeability test results also showed that the ratio of permeability of Vietnam sand to that of Mailiao silty sand is also approximately 15. It appears that the permeability have a significant effect on pore water pressure dissipation after shaking.
The results of shaking table test of Mailiao silty sand, showed that if liquefaction occurred, the volumetric strain is only related to relative density regardless of the acceleration of vibration, frequency of vibration or direction of vibration. Volumetric strain decreases with increase of relative density of the specimen. The test results were compared with Vietnam clean sand, it showed that the relative density of the volumetric strain of Mailiao silty sand were higher than that of Vietnam clean sand in Dr = 45 ~ 70 %, but there is no significant difference between Mailiao silty sand and Vietnam sand after Dr = 70 %.
Subjects
麥寮砂
大型剪力盒
振動台
孔隙水壓
壓縮性
體積應變
Mailiao Sand
laminar box
shaking table
pore water pressure
compressibility
volumetric strain
Type
thesis
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