Experimental Study On Stress Distribution Of GFRP Bolt Anchor

As an active support method,bold support has now become the most important support method in geotechnical engineering.It is widely used because its support effect is relatively better than other passive supports.However,there are few studies on the anchoring mechanism of the bolt,especially on the fiberglass bolt.This paper majorly studies on the fiberglass bolt,which is widely used in various fields,and studies in details on the internal stress with the methods of theoretical analysis,experimental study,numerical stimulation,etc.The writer puts forward whether the fiberglass bolt complies with the law of elasticity and whether elasticity can be used to study tis mechanical characteristics by comparing the structural difference between the fiberglass bolt and the steel bolt,and finds the conclusion that the fiberglass bolt complies with the law of elasticity and elasticity can be used in the study by designing a single bolt tensile experiment and collecting and analyzing the strain data.The axial force distribution of the full-length bolt and shear stress distribution at the interface of the bolt are deduced by respectively applying the shear lag model in the composite model and the mindlin's solution based on the elastic mechanics in the bolt.By concluding the stress distribution of bolt when subjected to the drawing load through examples,the writer finds that both the axial force and the shear force are concentrated at the end of the bolt.By assuming that the bolt is in an infinitive body,the writer makes an approximate deduction of the stress distribution at the end of the bolt section with kelvin solution in elastic mechanics.The tensile experiment of the bolt was designed to further study the internal stress distribution of the bolt.The writer gets the law of internal stress distribution of the bolt and studies the influence of the bolts in two diameters on the stress distribution by testing the stress during the experiment with fiber grating sensor with little influence of the bolt effect.The results are analyzed and compared with the theoretical results.The FLAC3D numerical simulation software is used in establishing the bolt tensile experiment model.The interfaces in the bolt are simulated with the interface provided in the FLAC3D software,and the internal stress distribution of the bolt is monitored by setting monitoring spots in the model.The writer links the monitoring spots into a graph to analyze and study the influence of various load and diameter conditions on the internal stress distribution of the bolt.