Experimental Determination of Waste Tire Chip-Geogrid Interface Parameters Using Large Direct Shear Tests

Geosynthetics may be used with fills containing tire chips. Thus, it is necessary to understand the physical interaction between tire chips and the geosynthetic. This paper determines the interface shear strength parameters of tire chip-geogrid using large direct shear test apparatus. For this purpose, tire chip alone has been tested at a specified relative density and its shear strength parameters have been obtained as references to which shear strength parameters of tire chip-geogrid interface will be compared at the same compaction degree. For evaluating the influence of the aperture sizes of geogrid, two types of geogrids were used. In all tests, waste tire chips have been poured in a half shear test apparatus box and the geogrid layer has been located on it and then the rest of the half box has been filled with tire chip. The normal stress has then been applied and the test has been carried out to the terminating stage. In all tests, the shearing velocity has been kept the same. Three normal stresses have been applied in all tests. The test results shows that the interaction coefficient of geogrid A with bigger aperture size is higher than geogrid B.

کلیدواژه ها:

Waste tire chips ، geogrid ، large direct shear test ، tire chip–geogrid interface