| Author | Monoi, Yasushi |
| Call Number | AIT Thesis no.GT-88-05 |
| Subject(s) | Soil mechanics
|
| 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-88-05 |
| Abstract | A series of static and cyclic triaxial tests were carried out on
undisturbed samples of soft Muar Cl ay to study the pore pressure
developments, stress- strain behaviour and strength characteristics of the
'heavily' over consolidated soils under offshore type of loading. Heavily
over consolidated samples were initially consolidated along isotropic
consolidation line and were subsequently swelled back to have the same void
ratio as the normally consolidated sample.
The interpretation of the test results is firstly given on those under
monotonic loading. Shear strain contours, a bi-linear relationship between
the pore pressure and the stress ratio and a relationship between the
stress ratio and the DAFALIAS's a-value which reflects the variation in
plastic potential function were obtained from the results on heavily
over consolidated samples under monotonic loading.
Shear strain contours exhibited geometrically rather different
pattern from constant stress ratio lines. This fact suggests that shape of
shear yield locus which is similar to the experimental results could
predict the stress- strain behaviour better than yield locus of constant
stress ratio proposed by PENDER (1978).
A bi-linear relationship between pore pressure and stress ratio
established for heavily over consolidated samples has the different features
from that established for normally consolidated and lightly
over consolidated samples. Therefore the formulation for the stress paths
of the heavily over consolidated samples had to be modified from that
proposed for lightly over consolidated samples by HAND ALI (1986).
The variation of DAFALIAS's a - value with stress ratio indicated the
totally different behaviour of plastic potential function can occur in case
of heavily over consolidated samples for the stress ratio beyond that
corresponding to the peak deviator stress of the normally consolidated
sample.
The results of stress-controlled cyclic loading tests on heavily
over consolidated samples showed rather consistent trend in permanent pore
pressure development with the results of previous study. However the
permanent shear strain is accumulated in negative range.
The over consolidation ratio of samples did not affect significantly on
the linear relationship between shear modulus and strain amplitude. The
relationship is compared with that of Bangkok Clay, and the shift in the
relationships were observed, which could be attributed to the variation of
plasticity index.
An attempt was made to modify the PENDER's mod e l base d on the
experimental results. This formulation can be expected to predict the
behaviour .more precisely. |
| Year | 1989 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. GT-88-05 |
| 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) | Balasubramaniam, A.S. |
| Examination Committee(s) | Kuwano, Jiro |
| Scholarship Donor(s) | Kajima Co.(External) ; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1989 |