Abstract: In order to explore the shear cracking failure law and mechanical response mechanism of the slurry crack bonding surface,a new graphene based grouting material PPGF was taken as the research object. Direct shear tests of PPGFlimestone bonding body were carried out under different graphene content,crack roughness,and normal load conditions. The influence of graphene,crack roughness,and normal load on the cracking,shear stress,and normal displacement of the bonding surface were obtained. The results show that with the increase of graphene content,the maximum shear stress shows a pattern of first increasing and then decreasing,and the increase is maximum when the content is 0. 036%. When the shear failure of the bonding surface is dominated by climbing slip,the influence of graphene and normal load on the shear expansion displacement is relatively small. When the shear failure is dominated by shear slip,the influence of graphene and normal load on the shear expansion displacement is relatively large. Graphene can increase the bonding strength of PPGF and delay the cracking of the bonding surface. The cracking shear displacement increases with the increase of roughness and decreases with the increase of normal load.