The indoor shear tests of anchored jointed rock mass under different bolt angles and different normal stresses are carried out to study the law and the shear resistance mechanism of bolt anchoring on shear properties of jointed rock mass. The deformation and stress characteristics of anchored jointed rock mass under the action of normal and shearing force are explored; the shear deformation law of the jointed rock mass before and after anchoring is compared and analyzed; and the effects of bolt angle

normal stress of the joint surface and other factors on the shear resistance of jointed rock are discussed. The experimental results show that the shear strength of jointed rock mass can be greatly improved by bolt anchoring as the increase of the cohesive force and internal friction angle after bolting; the bolt angle has significant influence on the shear strength and shear deformation of the anchored jointed rock mass; and the larger bolt angle is helpful to mobilize the shear resistance of the bolts. The shear-displacement curves of the jointed rock mass have three segments after anchoring

i.e. the elastic stage

the yield stage and the plastic deformation stage. The shear strength of anchored jointed rock mass is improved with the increase of the normal stress of joint plane under the same bolt angle. It is found that the yield failure of bolts in the jointed rock mass occurs mainly in the section near the joint plane; and the local damage of the rock material occurs near the joint plane due to the lateral compression of the bolts.