Study into the hydraulic behaviour of geosynthetic and granular drainage materials | |
| Author | Jaisi, Deb Prasad |
| Call Number | AIT Thesis no.GE-02-02 |
| Subject(s) | Geosynthetics Granular materials Hydraulics |
| Note | A thesis submitted in partial fulfillment of the requirement for the degree of Master of Science, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. GE-02-02 |
| Abstract | Extensive transmissivity tests were conducted to evaluate the effect of boundary materials, hydraulic gradients, and applied normal stresses on the flow rate behaviors of geonets and geocomposite. The tests included two biplanar geonets, one triplanar geonet and one triplanar geocomposite. The boundary materials investigated were geotextiles, geomembrane, geosynthetic clay liner and compacted clay liner. The relationship of flow rate and hydraulic gradient was found linear when plotted in log-log scale. The flow rate was found to decrease with successive addition of geosynthetics in profile as a result of increased intrusion of boundary materials. The flow rate reduction factors of triplanar geonet were comparatively lower than bi planar geonets up to the stress limit of 200 kPa. At higher normal stress its reduction factors were significantly higher than biplanar geonets. It suggested that the performance of the triplanar geonet significantly reduces above a certain stress level. The creep tests showed higher compression and creep reduction factors of triplanar geonet at higher stress level, which also suppo1ted excessive flow rate reduction. The test on gravels showed that variation of apparent pe1meability with hydraulic gradient was higher in coarse gravel. The analysis of test results to the Sa Kaeo Landfill design suggested triplanar geonet could develop lowest leachate thickness in secondary liner than other biplanar geonet and triplanar geocomposite. But the safety factors of both types of geonets were almost same. The higher safety factors in biplanar geonets were due to their higher initial thickness and higher stiffness resulting lower compression and creep reduction factors. The coarse gravel in the primary liner was found efficient to collect and drain the leachate with possible maximum leachate thickness well below the designed thickness of gravel layer. |
| Year | 2003 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. GE-02-02 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Geotechnical Engineering (GE) |
| Chairperson(s) | Glawe, Ulrich; |
| Examination Committee(s) | Takemura, Jiro;Park, Kyung-Ho ; |
| Scholarship Donor(s) | Asian Development Bank (Japan Scholarship Program); |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 2003 |