Effect of different forms on geogrid tensile properties based on 3D printing technology

Abstract

Plastic materials are widely used as geosynthetics. The use of plastic products poses a serious environmental risk due to their degradation. Aiming at the environmental problems caused by the difficulty of direct degradation of traditional plastic geogrid and the effects of material filling ratios, material filling forms, mesh shapes and tensile rates on the mechanical properties of geogrids. Based on 3D printing technology, polylactic acid (PLA) geogrid was prepared, and indoor tensile tests of polylactic acid geogrid were carried out. The effects of material filling ratios, material filling forms, geogrid geometries and tensile rates on the mechanical properties of geogrid are analyzed. The test results showed that PLA can be used as an environmentally friendly material for making geogrids and can reflect the mechanical properties of different geogrids. The triaxial geogrid had the greatest tensile strength, while the uniaxial one had the least. The tensile strength of triaxial and biaxial geogrids increased with the increase of tensile rates, while uniaxial decreased and then increased. The elongation at break of uniaxial and triaxial geogrids increased with increasing tensile rates, while biaxial increased and then decreased. With the increase of filling ratios, the tensile strength of geogrid increased and then decreased. For the line 45 angle printed geogrid, the elongation at break increased first and then decreased and finally increased.