Abstract：A large scale direct shear test was carried out in the laboratory for typical slope in Lüeyang moutain area of Shaanxi province to study the shear characteristics of the slope packing. The shear stress-shear displacement curves, dilatancy and shrinkage characteristics, shear strength and shear strength parameters were analyzed in detail. The results showed that the shear stress-shear displacement curves could be roughly divided into linear deformation stage, initial yield stage, and hardening stage, and a slight“jumping”phenomenon occurred during the shear process because of the existence of the stone. The dilatancy and shrinkage of high stone content slope packing were more obvious than that of low stone content slope packing. Under the condition of the same stone content, the more normal stress was in the shear shrinkage zone, the more obvious shear shrinkage appeared, while the opposite was true in the shear dilatancy zone. The shear strength of the roadbed filler was higher when the rock particle content was between 45% and 65%. It also could be concluded that the internal friction angle increased with the increase of the rock particle content, but the cohesion increased first and then decreased, then increased again and then decreased.

Keyword：slope packing;direct shear test;rock particle content;cohesion;internal friction angle;