Abstract: By using homemade shear equipment, the mechanics characteristic of the weak intercalated layers in the slope rock mass are carried out. The shear stress-deformation curves have the obvious proportion limit, submission and peak stress, which indicate that, at the initial stages of the shear deformation, the shear stress-deformation is linear and the shear stiffness don’t change. With the increase of the vertical stress, the peak shear stress increases linearly. After the peak strength, the shear strength changes little with the increase of the shear deformation, and the remnant strength is approximately equal to the peak, the experiment sample subvert, which is the ‘plastic’ subversion type. The shear deformation can be divided into 3 stages, the strength parameters in every stage vary, for the slope engineering, which must have enough safety coefficient, the low strength parameters are recommended. Basing on the experiment results, it is found that the vertical stress-compression displacement curve is the hyperbola, when the vertical displacement is less than 3.4 mm, the experiment result be more close to the theoretical value. The results will guide the stability analysis and the reinforcement programme design of the high slope.

Key words: slope, rock mass, weak intercalated layers, mechanical property, experimental study