Finite element analysis of embankments and slurry trenches | |
| Author | Siriwardane, T. Hema Jayalath |
| Call Number | AIT Thesis no.1016 |
| Subject(s) | Finite element method Embankments |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering of the Asian Institute of Technology, Bangkok, Thailand. |
| Publisher | Asian Institute of Technology |
| Abstract | The undrained behaviour of embankments , and slurry trench excavations were studied using finite element method. The full scale test embankment which was built rapidly to failure at Nong Ngoc Hao site, was analyzed by sequential loading technique. This was followed by the analysis of the long embankment with non-uniform cross section built at Nong Ngoc Hao site. The behavi our of the slurry trench excavation was investigated assuming the soil profile at Nong Ngoo Hao. The results of the bi-linear analysis of embankments (under plane strain conditions) showed that a modulus value of 100 times the vane strength gave good predictions of deformations which were in agreement with measured values. The finite element method using non-linear stress-strain relationships obtained from CU Tests, and incremental loading (simulating the construction history) predicted the deformation as measured. The sequential loading analysis predicted higher values of displacements, than those by gravity turn-on analysis. Modulus values does not have a significant effect on the factor of safety. The predicted factor of safety by finite element method, was very close to 1 at failure. Pore pressure predictions by Skempton' s and Hankel'·s methods were in good agreement with measurements. Henkel's method gave lower values than the predictions using Skempton's method. The slurry trench method of construction can be used without failure in the soft clay (15 m layer) at this site. Even a water filled excavation can s t and without failure. However, results showed that in a water filled deep excavation, failure may occur due to a sudden drawdown of 1 or 2 m. In deep slurry trench excavations, largest lateral movements of cut surface occurred in a region of mid depth. The density of slurry had significant effect on the deformations and factor of safety. |
| Year | 1976 |
| Type | Thesis |
| School | Student Research Before 1980 |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Thesis (Year <=1979) |
| Chairperson(s) | Balasubramaniam, A.S. |
| Examination Committee(s) | Brand, E.W. ;Brenner, R.P. |
| Scholarship Donor(s) | Gove,rnment of United Kingdom |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1976 |