Sample Preparation of Mailiao Sand in Large Scale Biaxial Shear Box on Shaking Table
Date Issued
2006
Date
2006
Author(s)
Zou, Cheng Fu
DOI
zh-TW
Abstract
Abstract
This study assesses the sample preparation of large specimens of Mailiao sand from Yunlin county . Mailiao silty sand is a typical reclaimed soil with a high fines content and high compressibility in the reclamation industrial areas in the wester Taiwan. There will be difficulties of controlling saturation and uniformity of the sand in preparing large specimens of sand containing fines. It was found that there is no evidence of air bubbles in the soil and unevenness of sample surface when sample prepared by staged sedimentation method in a small glass case. Except a top thin layer of sand with a higher fines content there is no significant difference of fines content in other depths of sand specimen.
We adopted this method for sample preparation of Mailiao sand in large biaxial laminar shear box at the National Center for Research on Earthquake Engineering (NCREE). The results of P-wave velocity measurement confirmed the saturation of the sand specimen. After the shaking table test, 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. This relatively low permeability layer resulted in longer duration of dissipation of generated pore water pressure and surface settlement compared with those of the clean Vietnam silica sand. The sand boils were observed when the water with high pressure flowed out through a weak relativly impervious layer of sand. Under the same shaking, the liquefaction depth of Vietnam silica sand is deeper but the volumetric strain is smaller than those of Mailiao sand.
Key words: Mailiao sand, sample preparation, liquefaction, shaking table test, pore water pressure, volumetric strain.
Subjects
麥寮砂
試體準備
液化
大型剪力盒
振動台
孔隙水壓
體積應變
Mailiao sand
sample preparation
liquefaction
shaking table test
pore water pressure
volumetric strain
Type
thesis
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