| Author | Hwang, Seon Keun |
| Call Number | AIT Thesis no.GT-87-08 |
| Subject(s) | Sand--Testing
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. GT-87-08 |
| Abstract | To find the effects of fine content, clay content and plasticity
index on the cyclic behaviour of sand containing fines a series of the
cyclic triaxial tests were carried out underthe uniform and irregular
loadings. The samples were prepared in the consolidation box with
different fine contents. The sand taken from Nakhorn Pathom and the
Bangkok clay were used for the mixture.
The behaviour of sand containing different amounts of fines was
investigated under the uniform and irregular types of cyclic loading.
Under the uniform cyclic loading, the initial liquefaction was observed
after the occurrence of 10% D.A. axial strain for all samples containing
fines, while for clean sand it appeared before the development of 2.5%
D. A. axial strain. Generally, the slopes of liquefaction curves for sand
containing fines were much flatter than those for clean sand . The
liquefaction strength of these samples defined by the strain at 10 cycles
was less than that of clean sand up to the fine content of 35%. However,
when it was defined by the amount of the excess pore water pressure, the
sand with fines shows a higher liquefaction strength. The liquefaction
strength increased abruptly when the plasticity index exceeds 10.
The earthquake record obtained at KAIHOKU Bridge site during the 1978
MIYAGIKEN-OKI Earthquake was used as an irregular loading. The generation
of excess pore water pressure and axial strain under the irregular loading
were greatly affected by the peak shear stress. The changes in fine
content from 25% to 35% did not affect much on the relationship between
maximum shear stress ratio and excess pore water pressure. For the sample
with 40% fines, however, the maximum s hear stress ratio causing a certain
excess pore water pressure ratio was about 50% greater than that for 25%
to 35% fine content samples. The generation of peak and residual excess
pore water pressure were not much affected by the increase in f ine content
within the range of 25% to 35%. The residual and peak axial str ain at any
maximum shear stress ratio decreases with the increase in fine content .
However, there was no clear effect of fine content on the relationship
between the residual axial strain and the residual pore water pressure .
The coefficient of load irregularity was found to be 2.1. |
| Year | 1988 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. GT-87-08 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Geotechnical and Transportation Engineering (GT) |
| Chairperson(s) | Kuwano, Jiro; |
| Examination Committee(s) | Balasubramaniam, A.S. ;Noppadol Phienwej; |
| Scholarship Donor(s) | Government of Germany; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1988 |