| Author | Vasantharajah, Namasivayam |
| Call Number | AIT Thesis no. GT-85-19 |
| Subject(s) | Rockfills--Testing
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| 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 |
| Abstract | The study of strength and deformation characteristics of field rockfill materials in a laboratory is limited due to their large size of particles. Because of this limitation some techniques were proposed, during the past, to extrapolate the behaviour of field rockfill materials from the test results of conventional triaxial tests carried out in laboratories. However, the effect of particle size in a three dimensional stress system has not been studied for rockfill materials in the past . In this study rockfill specimens of two uniform gradations were subjected to a three dimensional stress system by using a cubical triaxial apparatus with three flexible boundaries. The strength and deformations of the rockfill material were investigated when the intermediate principal stress varied from the minor principal stress to the major principal stress, and a comparison was made for the test results of two uniform gradations. In addition two large triaxial tests were performed. The test results of cubical specimens indicated that the inherent anisotropy, originated during sample preparation under water by plunging method, exerted a strong influence in the deformation characteristics. This influence of inherent anisotropy became more for the specimens with larger particles. The angle of internal friction represented as that corresponding to maximum volume contraction point showed a steep rise up from the triaxial compression condition to the vicinity of the plane strain condition and thereafter gradually dropped till the extension condition was reached, with the value at extension being greater than that of at compression. This trend, in shape as well as in magnitude, was found to be not influenced by the particle size for the void ratio level used in this investigation. The large triaxial test predicted a higher angle of internal friction compared to that of cubical triaxial test in triaxial compression condition. Also, the large triaxial test results indicated a reduction in the angle of internal friction as the effective confining pressure was in creased. |
| Year | 1986 |
| 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) | Towhata, Ikuo |
| Examination Committee(s) | Balasubramaniam, A.S. ;Bergado, Dennes T. |
| Scholarship Donor(s) | The Royal Norwegian Government |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1986 |