A re-analysis of Nong Ngoo Hao test embankment | |
| Author | Ho, Yui-man |
| Call Number | AIT Thesis no. 906 |
| Subject(s) | Soils--Thailand--Nong Ngoo Hao--Testing 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 | This dissertation is concerned with a detailed study of the stability analysis of the trial test embankment built to failure at Nang Ngoo Hao . It is an extension of the work carried out by Boonsinsuk, but emphasis is made in carrying out additional laboratory shear tests which when incorporated with the existing data would prove to be more or less complete. Undrained shear strengths were measured by field vane, direct shear, unconfined compression, triaxial unconsolidated-undrained and triaxial consolidated-undrained tests. The effective strength parameters were determined by triaxial CIU and GAU tests. Total and effective stress analysis using Fellenius and Bishop Simplified methods were carried out on the actual and theoretical slip surface employing various strength parameters and modes of failure. From the investigation, total stress analysis using Fellenius method with undrained shear strength measured in triaxial UU test appeared most suitable and yielded a promising range of theoretical safety factors from 0.97 to 1.13 for all assumed modes of failure. Based on the observed failure surface, effective stress analysis using Bishop Simplified method with measured pore pressure and effective strength parameters from both CIU and GAU tests gave a factor of safety ranging from 1.01 to 1. 27 for all modes of failure. It appears discrepancy between predicted and measured excess pore pressure was due to dissipation, local yielding within overstressed zone prior to failure and stress redistribution in the fill. The use of effective stress analysis is only justified unless information are available about pore pressure, strength parameters and location of critical slip surface. |
| Year | 1975 |
| 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) | Government of Canada; |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 1975 |