Study On The Stress Distribution Law And Influencing Factors Of Glass Fiber Reinforced Plastic Bolt Based On PFC

In this paper,the numerical simulation method is used to study the shear stress and axial force distribution of FRP under the interaction of load,and the influence factors of anchor stress distribution are discussed by changing the parameters of anchor and anchoring agent.To achieve the purpose of optimizing the design.The stress distribution characteristics of FRP bolts during drawing are studied by using PFC mesoscopic particle flow software.And the results are applied to the support of the excavation face of the excavation work of the Baoye Coal Mine,and the accuracy of the numerical simulation method for the bolt research is verified.The stress transfer law and distribution of the bolt are very important for the study of the anchoring mechanism of the surrounding rock.The numerical simulation results show that the distribution of shear stress of the FRP anchor during the drawing process is increased from the drawing end to the anchoring end of the bolt,and the maximum position is closer to the orifice.The axial force of the anchor is decreasing.By simulating the stress distribution of anchor under different influencing factors,we can see that the bolt diameter,the elastic modulus,the anchoring length and the elastic modulus of the anchor affect the stress distribution of the bolt.The greater the elastic modulus of the anchor,the greater the shear stress of the anchor,the greater the degree of change in axial force.With the increase of the elastic modulus of the bolt,the axial force increases gradually,and the axial force is larger in the middle of the bolt.the trend of the axial force decreases with the approaching to the other side.The variation of the axial force of the bolt also slows down with the increase of the diameter of the bolt.With the increase of anchor anchorage length,the shear stress and axial force of the bolt are not linearly changed,but the shear stress and axial force decrease gradually with the increase of anchorage length in a certain range.When the anchorage length reaches one Timing,shear stress will continue to increase,so there is the best anchor length.