| Author | Chang, Chung-ching |
| Call Number | AIT Thesis no.GT-79-05 |
| Subject(s) | Clay--Thailand--Bangkok--Testing
|
| Note | A thesis submitted in the partial fulfilment of the requirement for the degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Abstract | An evaluation of various sampling procedures for soft clay presently in use in the Bangkok area is presented. Samples were taken from 3 m
depth, i .e. in slightly weathered clay, by the following methods: (1) 3- in open drive thin-walled tube sampler, (2) 3- in thin-walled tube with a free
piston, (3)10-in AIT (free) piston sampler, (4) Lowe-Acker piston plug composite sampler and (5) block sampling. The sample quality achieved with the four types of sampler was compared to that obtained from the block
samples by means of four types of laboratory tests, namely (1) unconfined compression tests, (2) unconsolidated undrained triaxial tests (3) consolidated undrained triaxial tests, and (4) oedometer tests with small load increments. The quantities compared were: undrained shear strength, strain at failure, secant modulus, and in the case of oedometer tests maximum past
pressure and compression ratio. As expected, the open drive sampler produced the lowest quality of samples, but the influence of sample disturbance on the properties investigated varied greatly. While the shear strength was only about 15% lower than that resulting from the specimens taken from the
block samples, the modulus and failure strain values differed by almost 100%. The maximum past pressures and compression ratios determined from open drive thin-walled tube samples were about 20% lower than those found from block
samples. Regarding the other sampler stetted, the sample quality decreased in the following order: 10-in sampler, Lowe-Acker sampler, 3-in free piston sampler and open drive thin-walled tube sampler. Block samples were, however, always much superior to samples retrieved by any of the borehole samplers employed. |
| 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) | Balasubramaniam, A.S. ; Jerasak Premchitt |
| Scholarship Donor(s) | Government of the Republic of China |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1980 |