Numerical analysis for the shear characteristic of structure plane reinforced by rock bolt in rock mass

In order to study the mechanical and deformation characteristic of structure plane in rock mass,under the situation of reinforcing by bolt,the numerical analysis method was adopted. The three dimensional calculation model was founded for simulation the direct shear test of structure plane. The structure plane surface situation and bolt inclination were changed to study their effect to the strength and deformation characteristic of structure plane. The analysis results show that after reinforced by bolt,the shear strength of structure plane is improved,and the equivalent cohesion has the larger degree of improvement,and when the undulating angle of structure plane is 0,it will get its maximum shear strength when bolt angle is 15°,and then with the increase of bolt angle,the shear strength of structure plane reduces gradually,and when the undulating angle of structure plane is 17°,the shear strength of structure plane exist for the bolt angle in the range of 30 ～50°.