| Author | Navaneethan, Thiruchelvam |
| Call Number | AIT Thesis no.GE-98-27 |
| Subject(s) | Clay--Thailand--Bangkok--Testing
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master
of Engineering, School of Civil Engineering |
| Publisher | Asian Institute of Technology |
| Abstract | The stress-strain behavior of soft Bangkok clay within the State Boundary Surface
has been studied in details under extension loading conditions by carrying out series of
tests, fifteen overconsolidated and a normally consolidated, which were isontropic
consolidated samples. All overconsolidated specimens were performed under different
applied stress paths with the same OCR of 2. 7 5. Initial pre-shear void ratios were within
a narrow band of 1.82 to 1.91.
Consolidation and Swelling parameters 'A and K values are 0.53 and 0.098,
respectively. The M value corresponding to the peak deviator stress and peak stress ratio
conditions is 0.96. The volumetric yield locus, the Hvorslev Surface and the tension
failure line are evaluated and plotted in (p, q) plot. In the (pipe, qlpe) plot, the failure
points trend to cluster around the Critical State point.
The contours of strain within the State Boundary Surface are presented and
discussed. Based on the total and plastic strains, the contours of strain can be presented in
the normalized (pipe, qlpe) plot. From the total volumetric strain contours plot, the area
within the State Boundary Surface can be divided into two zones. The volumetric strain
in Zone I is positive whereas the volumetric strain is negative in Zone II. The region
within the State Boundary Surface is divided into three zones based on the plastic
volumetric yielding. In Zone I, the plastic volumetric strain is purely elastic and is closed
to the isontropic axis. This behavior supports the elastic wall concept of Cambridge
group. In the Zone II on the wet side, compressive plastic volumetric strains take place,
whereas in Zone III dilational plastic volumetric strains occur. Stress circles and
corresponding strain contours also plotted.
Finally, experimental results were compared with predictions of Pender's Model
(Pender, 1978). It was found that the model provides reasonably good prediction within
the State Boundary Surface. |
| Year | 1999 |
| Type | Thesis |
| School | School of Civil Engineering |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Geotechnical Engineering (GE) |
| Chairperson(s) | Balasubramaniam, A. S.; |
| Examination Committee(s) | Seah, Tian Ho;Der Guey, Lin;Otsu, Hiroyasu; |
| Scholarship Donor(s) | Asian Institute of Technology Partial Scholarship; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1999 |