The shearing box allows to measure the friction at the geosynthetic interfaces under great normal stress (IN ISO 12957-1 ( 2005 )). The upper box is fixed and coupled with a force sensor in tension/compression to measure the shearing stress. The lower box is mobile. The size of both boxes (200 mm x 200 mm for upper box and 200 mm x 600 mm for lower box) allows to perform tests on geosynthetics wth large sizes and for large displacements.The displacement of both boxes are monitorted by sensors laser and LVDT. All sensors are connected to data logger.