| Author | Boonkiat Panichayatum |
| Call Number | AIT Thesis no. GT-86-08 |
| Subject(s) | Embankments
|
| Note | A thesis submitted in partial fulfilment of the requirements for the degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Abstract | To compare the performance of embankments on improved
soil by vertical drains and granular piles, two full scale
embankments were constructed inside the AIT campus on improved
soil by previous investigators. This study serves to continue
the investigation and adds the height of embankment on
granular piles corresponding to the embankment on vertical
drains. The settlements and pore pressures under the
embankments were continuously recorded with time. An attempt
was made to predict the time settlement and pore pressure
characteristics of these two embankments and compared with the
observed data in the site. The result from one dimensional
method combined with the BALAAM' s chart for settlement
reduction give the good agreement with the observed data for
behavior of embankment on granular piles. For the embankment
on vertical drains, the rate of settlement prediction by
ASAOKA' s method using back-analyzed parameter gives the best
agreement and it show that at 90% consolidation prediction of
this embankment will be reached after 330 days similar to the
previous research prediction. By the observed data at the time
of 400 days, the settlement on vertical drains settled about
88% more than the embankment on granular piles, this confirmed
the settlement reduction of the embankment on granular piles.
Back analysis was used to determine the coefficient of
consolidation by the observed subsurface settlement data, The
coefficient of consolidation from back analysis was higher
than from laboratory oedometer test. In addition, probabilistic slope stability analysis of the embankments using
simplified Bishop method of slices was used in this study. The
PROBISH program was used to predict the minimum safety factor
for deterministic analysis and the probability of failure for
pr9babilistic analysis. A series of vane shear tests on unimproved soil were performed to obtain the parameters used in
the probabilistic analysis including autocorrelation function .
The mean of shear strength trended to increased with depth.
This trend was eliminated before computing the autocorrelation
by regression analysis. The results show that the factor of
safety on the embankments on granular piles was increased by
13% and the probability of failure increase from 1. 62E-37 to
1. 13E-06 when 5% model error was included in the analysis. |
| Year | 1987 |
| 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) | Bergado, Dennes T. |
| Examination Committee(s) | Rantucci, Giovanni ;Towhata, Ikuo
|
| Scholarship Donor(s) | King's Scholarship
(Royal Thai Government) |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1987 |