Stress-strain properties of non-woven geotextiles under unconfined and confined conditions | |
| Author | Li, Sun-chung |
| Call Number | AIT Thesis no. GT-93-06 |
| Subject(s) | Strains and stresses 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. GT-93-06 |
| Abstract | The behavior of reinforcement embedded in the soils is a predominant factor of the stability of reinforced earth strnctures. Basically, there are two methods to investigate this interaction behavior, namely: direct shear test and pullout test. Thirty-two sets of large pullout tests were conducted in this research. Two kinds of geotextiles were tested consisting of high strength and low strength nonwoven geotextiles under two types of backfill soils, namely: locally available backfill materials such as Ayutthaya sand and weathered Bangkok clay. The high strength and low strength geotextiles are represented by Polyfelt PEC-200 and TS-700, respectively. To minimize the booodary effect, the geotextile specimens were 26 cm narrower than the width of pullout box and a plastic cloth was placed inside the box. An inside clamping system, which allows the geotextile specimens remained l 0 cm away from the front wall of the box at maximum pullout displacement, was used to reduce the front wall effect. The test results show that the pullout resistances mobilized along the soil and geotextile interfaces increase proportionally to the normal stress. The stiffer and higher stress-strain cu1ves were found when the geotextiles embedded in soil confinements than that in air. The residual strength, mobilized at about 12 cm pullout displacement, for TS-700 geotextile was almost the same as the unconfined strength. The efficiency factors decreased when the nonnal stress increased. The high strength geotextile generated larger pullout resistance, about three times, than that of low strength geotextile. Higher interaction parameters were obtained for higher strength than lower strength geotextiles due to wider area of interface mobilization. The hyperbolic model can fit the pullout force versus pullout displacement curves, especially for the high strength geotextile. |
| Year | 1994 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. GT-93-06 |
| 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 Republic of China; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1994 |