Abstract:

Rock bolting is a support widely used in slope engineering， tunnel and large cave support， as well as reinforcement of building structure.As the main part of support structure， the bolt must have enough reliability and durability.However， it is easily eroded by the environment for steel， so the durability of steel bolt being used commonly should be paid more attention to.The glass fiber reinforced plastics (GFRP) bolt is a new kind reinforcement material which is compounded with resin and glass fiber， having better mechanical property and  corrosion resistance. The durability problem of slope engineering can be solved if GFRP bolt take the place of steel bars.The tensile test studies the failure characteristic and anchoring mechanism of GFRP anchor rod with different diameters of 16 and 32， under the same lithologic characters and three different weathered conditions of adjoining rock: complete， modest and slightly. The result indicates as follows:The GFRP anchor rods with different diameters finally fail in the way of brittle split failure. The ultimate bearing capacity of GFRP anchor rod increases with its diameter. The stress transmission depth of 16 is affected less by weathered degree of adjoining rock， while the one of 32 is affected greatly by weathered degree. The stress transmission depth of GFRP anchor rod increases with the weathering degree of adjoining rock. The bond strength between the GFRP anchor rod and the surface of mortar decreases as the diameter increases.

Key words: slope, GFRP anchor rod, tensile test, bond strength