Strength and suction-moisture retention of a compacted residual volcanic soil | |
| Author | Lam, Kin-sang |
| Call Number | AIT Thesis no.GT-79-13 |
| Subject(s) | Strength of materials Soil moisture |
| Note | A thesis submitted in partial: fulfillment of the requirement for the degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Abstract | The stress-strain and strength properties, as well as the suction moisture retention of a compacted, residual, volcanic soil from the Tai Po area in Hong Kong were investigated. After establishing the dry density water content relationship from Standard Proctor compaction tests, five series of consolidated undrained triaxial tests on saturated specimens and three series on unsaturated specimens at predetermined initial dry densities and water contents were carried out. Pore water pressures were monitored during all these tests. Cavitation in the unsaturated tests was prevented by the axis translation method. In addition, 15 unconfined compression tests were performed also using the axis translation method. The suction-moisture characteristics were established from pressure plate, pressure membrane and volumetric pressure plate tests. The results are presented in terms of stress paths, deviator stress, pore pressure and volume change vs axial strain curves and the effect of partial saturation on the strength is expressed in terms of Bishop's X parameter and also by Fredlund's stress state variables. The results showed that the compacted soil behaved similarly to an over consolidated clay and that the strength parameters c' and ¢', obtained with saturated specimens were little influenced by the molding water content and dry density. For the unsaturated specimens, both Bishop's and Fredlund's approach yielded numerically similar strength equations. unconfined tests, the maximum deviator stress was dominated mainly by the initial dry density and to a lesser degree by the suction and · degree of saturation. |
| Year | 1980 |
| 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) | Brenner, R.P. |
| Examination Committee(s) | Olesen, Svend Elsnab ; Prinya Nutalaya |
| Scholarship Donor(s) | Government of Japan |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1980 |