| Author | Wickremesinghe, Damika Sampath |
| Call Number | AIT Thesis no.GT-83-27 |
| Subject(s) | Sand--Testing
|
| Note | A thesis submitted m partial fulfillment of the requirement for the degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Abstract | The three-dimensional deformation behaviour of sand under drained conditions and the mode of pore pressure development in undrained conditions were modelled in this study.
The unloading and reloading characteristics of sand was investigated and the variation of the volumetric strain and the octahedral shear strain under drained conditions are presented for different stress paths. The modelling of unloading and reloading was attempted using four functions, namely, a unique linear function, Masing rule, modified masing rule and a modified linear function with non similar coefficients for unloading and reloading. As a result of comparison between the measured and predicted strains, the modified linear function provided the best results and as such was the best model to simulate the actual deformation of sand.
In order to determine the mode of pore pressure development accurately two types of models are suggested in this study. One model was based on the deduction that the increment of pore water pressure is equivalent to the product of the increment of volumetric strain and the unloading modulus of sand. Employing a series of statically performed cyclic loading tests the effect of shear stress on the reduction in Kr value was evaluated and was found to be in the region of approximately 23% This correction which was incorporated into the model resulted in a more accurate prediction of the pore water pressure under three dimensional stress condition. The other model was constructed using a direct correlation between the volumetric strain in drained tests and the pore pressure build up in undrained tests which have been conducted at the University of Tokyo. This model well simulated the measured pore water pressure. |
| Year | 1984 |
| Type | Thesis |
| School | School of Engineering and Technology |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Geotechnical and Transportation Engineering (GT) |
| Chairperson(s) | Yamada, Yasuo
|
| Examination Committee(s) | Balasubramaniam, A.S. ;
Chandra, Sarvesh
|
| Scholarship Donor(s) | The Royal Norwegian Government |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1984 |