| Author | Yau, Kwok Fai |
| Call Number | AIT Thesis no. GT-89-15 |
| Subject(s) | Embankments
|
| 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-89-15 |
| Abstract | This thesis illustrates stress path studies on soft clays under embankments
and in excavations. The stress path followed by a soil element depends on which
zone it is located, and the geometry of the embankments or excavations. Along
the centerline underneath the embankment, the total stress path followed by a
soil element in the weathered crust is much of lesser slope than the Ko-line in
the (q • ,p) plot. The total stress path for a soil element in the very soft clay
layer is above the Ko-line in the (q • ,p) plot and deviates from the standard
triaxial stress path used in conventional tests. The total stress path followed
by a soil element in the soft to medium stiff clay layer followed by a soil element
is along the Ko-line. For points outside the embankments, the total stress paths
are shown as the extension loading type. When the ratio of the base width of
the embankment to the soft soil layer thiclrness is greater than 2, the total
stress paths followed by a soil element in the soft clay layer is along the Ko
line. The one-dimensional loading condition can be used for the long term
settlement analysis. In the case of excavations, the total stress paths followed
by a soil element in the very soft clay layer along the centerline describes an
unloading extension state. It is found that the triaxial test can not simulate
the stress paths for points under the slope excavation. The triaxial unloading
extension test can simulate the stress paths for points under the vertical
excavation. Adjacent to the vertical surface of the excavation, the stress path
followed by a soil element can be simulated by the triaxial unloading compression
test. In view of the stress path followed by a soil element depends on which
zone it is located, the finite element analysis should incorporate the soil
parameters as described from the appropriate laboratory or field test which closely
simulates the stress path followed by the soil under the field condition. |
| Year | 1990 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. GT-89-15 |
| 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. ;Honjo, Yusuke; |
| Examination Committee(s) | Indraratna, Buddhima ;Rantucci, Giovanni |
| Scholarship Donor(s) | The Government of Korea ; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1990 |