| Author | Enriquez, Apollo Seno |
| Call Number | AIT Thesis no.GT-88-09 |
| Subject(s) | Embankments
|
| Note | A thesis submitted in partial fulfillment of the
requirements for the degree in Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. GT-88-09 |
| Abstract | In this study , deformation and flow parameters were
determined by inverse analyses using two tes·t embankments
improved with prefabricated vertical drains and granular
piles. Asaoka•s method based from Barron's Theory was used
with some modifications from Hansbo ' s Theory to take into
account of the effect of smear in the case of embankment on
vertical drains. The back- analyzed parameters (Eu , Ch and
Cv ) were used to predict the amount and rate of settlements.
Excellent agreements were obtained in the case of OneDimensional (Oedometer ) , Skempton- Bjerrum and Asaoka ' s
methods . One-Dimensional method with inclusion of initial
settlement over estimate the predictions. For the embankment
on granular piles, inverse analysis was carried out in two
stages. Good agreements were obtained on the predicted
amount and rate of settl~ments by Asaoka and Balaam ' s
methods on the final stage loading al though both slightly
overpredicted at the initial stage loading. The equilibrium
method always over estimate the predictions. Inverse
analyzed Ch r1e 1d / Ch 1ab is about 1.5 to 4.0, Cvr1e1d/Cv1ab is
between 1. 3 to 12 and Eu /Su is 150 . ·The back-analyzed C11
value is about 4.90 t / m2 • Consolidation tests and fi e ld vane
tests showed an improvement in shear strength and analysis
using three different methods of stress distributions showed
that the embankment on vertical drains is now normally
consolidated and is undergoing secondary compression while
the embankment on granular piles is still undergoing primary
consolidation and is about to be normally consolidated. The
preconsolidation pressures obtained from EOP-24hr
consolidation tests are 5% to 10% higher than those obtained
from conventional tests . Very high preconsolidation
pressures are obtained from EOP Loading tests which can be
finished in 15 to 180 minutes. Laboratory model test on clay
sample improved with granular piles showed a decrease in n
value with the increase in loading magnitudes. The
settlements in slow tests indicate that the reduction in
settlements are reduced by about 30% as compared with that
of quick tests. Greater settlement reduction is obtained for
higher area ratio and using gravels as granular pile
materials. |
| Year | 1989 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. GT-88-09 |
| 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) | Indraratna, Buddhima ;S. Sambhandharaksa
|
| Scholarship Donor(s) | Government of Denmark; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1989 |