Interaction between geogrid reinforcement and tire chip-sand mixture | |
| Author | Suriyon Prempramote |
| Call Number | AIT Thesis no.GE-04-12 |
| Subject(s) | Geogrids Tires |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. GE-04-12 |
| Abstract | The interaction between reinforcing and backfill materials is a significant factor for analysis and design of reinforced earth structures. It can be simplified as pullout resistance and direct shear resistance, which depend on both reinforcing and backfill materials. This study is therefore aimed at studying the interaction between geogrid and tire chip-sand mixture; determining the index properties of backfill materials, the shear strength parameters, the interaction coefficients, and the efficiency of geogrid reinforcements in tire chip-sand backfills; investigating the variation of displacement curves along geogrid reinforcements in tire chip-sand backfills; evaluating the ultimate tensile strength of geogrids; and interpreting the curves of pullout force-versus-pullout displacement obtained from in-soil pullout tests. Thus, numerous experiments including index tests, compaction tests, pullout tests, and large-scale direct shear tests were conducted to meet the mentioned objectives. Saint-Gobain and Polyfelt geogrids, which are different from each other, were selected as reinforcing materials whereas tire chip-sand mixtures at the mixing ratios of 30:70, 40:60, and 50:50 % by weight were used as fill materials. The test results revealed that the unit weight of tire chip-sand mixtures depended more on sand content, and less on water content. The mixture at the mixing ratio of 30:70 % was found to be the most suitable fill material. The pullout resistance and the pullout interaction coefficients of Saint-Gobain geogrids were higher than those of Polyfelt geogrids. In contrast, the direct shear resistance, the direct shear interaction coefficients, and the efficiency values of Polyfelt geogrids were higher than those of Saint-Gobain geogrids. For pullout curve interpretation, the method of Long (1996) and Bergado et al. (2000) was more effective than the method of Madhav et al. (1998) method. The ultimate tensile strength of Polyfelt geogrid was slightly lower than that of Saint-Gobain geogrid. Finally, Polyfelt geogrid and the tire chip-sand mixture at the mixing ratio of 30:70 % by weight were recommended as reinforcing and backfill materials for field applications. |
| Year | 2005 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. GE-04-12 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Geotechnical Engineering (GE) |
| Chairperson(s) | Bergado, Dennes T.; |
| Examination Committee(s) | Noppadol Phienwej; Pham Huy Giao; |
| Scholarship Donor(s) | Royal Thai Government Fellowship; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2005 |