سال انتشار: ۱۳۹۰

محل انتشار: پنجمین کنفرانس بین المللی پیشرفتهای علوم و تکنولوژی

تعداد صفحات: ۹

نویسنده(ها):

Mahmoud Ghazavi – Associate Professor, Civil Engineering Department, K. N. Toosi University
Javad Ghaffari – PhD Student, Civil Engineering Department, K. N. Toosi University of Technology
Amir Farshadfar – Graduate Student, Civil Engineering Department, K.N. Toosi University of Technology

چکیده:

The interest in effectively designing tire chips and tire chips-sand fills creates the need for the development of testing procedures to evaluate the interaction properties of tire chips and tire chips-sand with geosynthetics through pullout testing and direct shear testing. This paper determines the interface shear strength parameters of tire chip-sand-geogrid using large direct shear test apparatus. For this purpose, tire chip–sand mixtures with mixing ratios of 0:100, 15:85, 25:75, 30:70, 35:65 and 100:0 by volume were used as fill materials. The mixture 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-sand-geogrid interface will be compared at the same compaction degree. In all tests, the mixture has 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 mixture. 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. Four normal stresses have been applied in all tests. The angle of friction and cohesion for each mixture are presented. Also, the influence of the different parameters is discussed