| Author | Tien, Ming-hua |
| Call Number | AIT Thesis no. GT-93-07 |
| Subject(s) | Shear strength of soils--Testing
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree
of Master of Engineering, School of Civil Engineering |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. GT-93-07 |
| Abstract | When geotextiles are used to perform the functions of drainage, separation or
reinforcement; the interface may act as a weak plane or a potential failure plane. In order to
investigate the interface behavior between the soil and geotex:tiles, laboratory experiments
were carried out using the conventional and large scale direct shear test apparatus. The
backfill soil selected were fine sand (obtained from Ayuthaya) and weathered Bangkok
clay, the geotextiles selected were PEC200 ( woven, high strength ) and TS700 ( nonwoven, low strength ). A total number of forty-eight direct shear tests were performed
with different water contents and normal pressures under undrained condition. Eighteen
conventional direct shear tests were performed on soil only as a reference so that
comparison could be made. Thirty large scale direct shear tests were performed on soil
only and soil with two selected geotextiles, to understand the soil I geotextile interface
behavior.
The experimental findings can be summarized as follows :
( 1) Larger shear strength parameters were obtained by conventional direct shear test
than that by large scale direct shear test because of progressive failure.
(2) The values of the apparent friction angle () at the soil-geotextile intetface may be
larger or smaller than the angle of internal friction of the soil. The ratios of '6/
ranged from 0.76 to 1.19 in this study.
(3) The value of the apparent interface friction angle '6 decreases with increasing
normal interfacial stress an and increases with increasing geotex:tile stiffness.
(4) For large scale direct shear tests, geotextile embedded in various inclinations
(JOO, 600 and 900) with shearing plane , the total shear stress increased
compare to the shear stress of geotextile embedded in plane case, and the
maximum increase is at about the inclination of 42° and 38°, respectively, for
PEC200 and TS700 geotextiles. |
| Year | 1994 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis; no. GT-93-07 |
| Type | Thesis |
| School | School of Civil Engineering |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Geotechnical and Transportation Engineering (GT) |
| Chairperson(s) | Bergado, Dennes T. |
| Examination Committee(s) | Balasubramaniam, A.S. ;Sugimoto, Mitsutaka
|
| Scholarship Donor(s) | The Government of The Republic of China; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1994 |