Anisotropic Characteristics of Single Jointed Rock Mass Under Uniaxial Compression

Abstract

Jointed rock mass has special discontinuous structure, which shows complex anisotropic mechanical properties. In order to grasp the complex mechanical properties, a group of joint rock specimens with different dip angles were made by similar ratio to carry out uniaxial compression tests, and the peak strength of the rock specimens and their variation with dip angles β were obtained. The peak failure modes of the specimens were analyzed. The results show that the mechanical properties of the specimens are controlled by joint surface and rock block. Compared with the intact specimens, the mechanical parameters of the joint specimens are all reduced to varying degrees, and the compressive strength of the joint specimens is U-shaped with the joint inclination Angle, and the minimum value appears in the specimens with the joint inclination Angle of 60°.When the joint dip Angle is \(\beta = 0^\circ\sim{3}0^\circ\), the fracture failure along the axial stress direction occurs. When the joint dip Angle is \(\beta >45^\circ \), the rock begins to slip along the bedding plane. When the joint inclination Angle is \(\beta =90^\circ \), splitting failure along the bedding plane occurs. The research results can provide reference for engineering deformation and stability analysis of jointed rock mass.