| Author | Tran Duc Luot |
| Call Number | AIT Thesis no. GE-95-21 |
| Subject(s) | Geotextiles
|
| 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. GE-95-21 |
| Abstract | The use of geotextiles is widespreaded for applications in construction of embankment
over soft foundation in recent years. There are currently some uncertain assumptions in design
method available for the selection of geotextiles as reinforcement or in evaluating the effect of
this reinforcement upon the embankment behavior. In order to investigate the interface behavior
between the backfill soil and the geotextile in geotextile reinforced embankment, laboratory
experiments were carried out using large scale direct shear test apparatus. Weathered Bangkok
clay and Ayuthaya sand were selected as subgrade and backfill soil, respectively. Two types of
geotextile, namely: PEC-200 and TS-700, respectively referred as high strength and low strength
geotextiles were used in this research. A total number of thirty one large scale direct shear tests
were performed with different normal stresses and variour inclination of geotextiles. All of the
results of large scale direct shear test followed the Mohr-Coulomb failure criteria ('t = C + cr0 tan
~ ). With the different inclination angles of geotextile to the shear plane, the maximum increase of
shear force occurred at 40° and 41° for TS700 and PEC200, respectively. This relationship
seemed to be independent to normal stress. The orientation of geotextile as reflected by the
inclination factor, Ir, varied from 0.26 to 0.57 corresponding to initial inclination angle, 8, of 30°
to 90°. The maximum value of Ir was 0.57 and was found at 8 of 90°. Thus, the maximum
orientation of geotextile was only slightly greater than bisectional direction Cir= 0.5) and never
reached to tangential direction. Finally, the limiting mobilized geotextile strain increased with
increasing of confining stress and seemed to be not affected much by initial inclination angle. For
nonwoven needle punched geotextile TS700, the limiting strain varied from 5% to 14%.For
woven geotextile PEC200, strain of 3% to 5% were found at 30mm to 40mm of shear
displacement, and then geotextile was slipped due to limitation in shear box dimension. Confirm
inclination in test embankment, Ir of 0.25 to 0.50 agree with laboratory results, Ir not more than
0.57. |
| Year | 1996 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. GE-95-21 |
| Type | Thesis |
| School | School of Civil Engineering |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Geotechnical Engineering (GE) |
| Chairperson(s) | Bergado, Dennes T. |
| Examination Committee(s) | Ashford, Scott A. ;Sugimoto, M.
|
| Scholarship Donor(s) | The Government of Japan; |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 1996 |