Abstract: In recent years，the tailings dry stockpiling technology was gradually popularized and applied.Compared with the traditional tailings stockpiling technology，the dry stockpiling technique can reduce water content in tailings，increase the mechanical parameters of tailings，and improve the overall stability of tailings pond.In the new technology of tailings dry stockpiling with filling of large geotextile woven bag，the interface frictional strength between layers of geotextile woven bag is the main indicator which influences and determines the stability of the entire tailings dry stockpiling.According to the easy production processing of large-scale geotechnical “resembling direct shear apparatus”，tailings geotextile woven friction shear strength test under different moisture content and normal pressure is carried out，drawing the relationship curve between interface friction coefficient and shear strength of the tailings layer of geotextile fabric woven bags，simultaneously the linear fitting friction and shear strength equation is in line with the Mohr-Coulomb criterion.The shear strength equation can reflect the physical-mechanical parameters and deformation characteristics of the geotextile layer interface friction，to provide the basis for the stability calculations of dry stockpiling damming with tailings geotextile woven bags.

Key words: Tailings dry stockpiling, Geotextiles woven bag, Layer interface, Friction strength, Resembling direct shear apparatus