| Author | Hassan, Sajjad |
| Call Number | AIT Thesis no.GT-88-15 |
| Subject(s) | Rockfills
|
| Note | A thesis submitted in partial fulfilment of the requirements for the Master of
Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. GT-88-15 |
| Abstract | A comprehensive set of laboratory investigations was carried out to study·
the strength behaviour of partially saturated rockfill materials taking degree of
saturation and percentage of fine content as the controlling parameters. The
material used in this study is that used in the construction of the embankment
of Chiew Larn dam in southern part of Thailand.
Main part of the study included consolidated undrained triaxial tests using
conventional apparatus. The gradations A, B, C, D were tested having 0%, 6%,
I 0%, 15% fine contents respectively. The samples were prepared at a dry depsity
of about 1. 95 t/cu.m. They were 2 inches in diameter with the variatlorl of
degree of saturation from lower to higher value in steps. The values of
confining pressure used were 5 tf/sq.m., 8 tf/sq.m. and 1 Otf/sq.m. Shear strength
value at failure showed almost linear decrease with increase in degree of
saturation. Cohesion value showed substantial decrease with increase in degree
of saturation and it was zero for fully saturated samples. The decrease in
internal friction angle with increase in degree of saturation was not much and
was within the range of 30 to 36 degrees. The material showed tra11sit1on trom
granular to silty behaviour with the increase in fine content from 5% to 10%. 1t
gave parallel lines in the plotting of total stress minus measured excess pore
pressure showing the effect of suction.
Another set of tests was carried out using triaxial cell for partially
saturated soil preparing samples for dry density of about 2.14 tf/cu.rn. and with
10% of fine content. The sample diameter was 2 inches which was the same as
the previous studies. The value of shear strength at failure for about 40%
degree of saturation was substantially higher as compared to that of about 70%
degree of saturation and the dry sample showed strain softening behaviour. The
excess pore air pressure gave negative value at failure for all samples as they
were dense. Effective stress condition at failure was affected by the value of
suction at decreased degree of saturation. |
| Year | 1989 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. GT-88-15 |
| 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) | Kuwano, Jiro |
| Examination Committee(s) | Bergado, Dennes T. ;Noppadol Phien-Wej
|
| Scholarship Donor(s) | Th e Government of Netherlands ; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1989 |