| Author | Sivaneswaran, Nadarajah |
| Call Number | AIT Thesis no.GT-92-04 |
| Subject(s) | Embankments--Malaysia
|
| 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-92-04 |
| Abstract | In the recent past, various new ground improvement techniques had been developed and
applied to enhance the performance of soft clay underneath embankments. However, choosing
the appropriate technique for any particular requirement has been a challenging problem for
geotechnical engineers. This study identified the relative merits of these techniques in terms of
settlement and lateral deformation behaviors, by analysing trial embankments built on Malaysian
Muar flat site. In particular, two embankments, one with sand compaction piles and the other
with preloadings, geogrids and vertical drains are analysed by the finite element program CRISP
and the results are compared with the field observations. In the above analysis, the critical state
soil parameters K, λ and M are assumed as constant. In order to incorporate the creep settlement
as a component in the total settlement, calculations for creep settlement are made based on the
assumption that the creep deformation takes place under constant volume conditions.
Predictions of embankments treated with geogrids and vertical drains for three cases of
without the drains, with the drains only and with drains and geogrids are made to estimate the
effectiveness of each technique separately. The interface between the soil and the reinforcement
was modelled by using interface elements with a linear elastic perfectly plastic constitutive
model. This model showed good matching with the measured values when creep settlements are
added to this finite element solutions.
In the analysis of the embankment treated with sand compaction piles, the sand drained
ground is modelled by two different models with, ideal, and, non ideal drains. The sand
compaction pile is modelled as linear elastic material and at any depth the Young's modulus of
the pile material is taken to be equal to the soil modulus at that depth. In order to consider the
effect of the rigidity of sand compaction piles, the ratio of the pile and the soil moduli is varied
and the settlement and lateral deformation behaviors are analysed.
The settlement and the lateral deformation behaviors are normalized with the depth
irrespective of the ground improvement schemes. The distribution profiles of excess pore
pressures and the lateral deformations with time are used as indicators for the stability condition
of the embankments. |
| Year | 1993 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. GT-92-04 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Geotechnical and Transportation Engineering (GT) |
| Chairperson(s) | Balasubramaniam, A.S.;Bergado, Dennes T.; |
| Examination Committee(s) | Noppadol Phien-Wej;Tian Ho Seah; |
| Scholarship Donor(s) | German Academic Exchange Services (DAAD); |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1993 |