In-situ test of glass fiber reinforced polymer anchor on highway slope reinforcement

Glass fiber reinforced polymer(GFRP) anchor is a new composite reinforcement material composed of resin and glass fiber; and it has good corrosion resistance and mechanical properties. The tensile, creep behaviors and temperature effect of GFRP were measured in laboratory by strength test, temperature test and creep test. According to test data, the feasibility of GFRP applied to permanent reinforcement engineering is discussed. The tests show that the GFRP anchor is brittle material whose elastic modulus is approximately 40 GPa and yield strength can reach to 400 MPa. The thermal stability of GFRP is similar to HRB335steel applied to engineering within working temperature range and under working load conditions. GFRP can not take place sustained creep deformations under design load for anchor. Guangdong-Jiangxi highway K3+728-904right slope reinforcement adopted GFRP anchor frame beam structure as permanent reinforcement engineering. Through in-situ monitoring of GFRP anchor stress, deformation of reinforced slope and whole displacement, the reliability of permanent GFRP anchor reinforcement structure is discussed. The monitoring data show that the stress variation of GFRP anchor corresponds with the loading variation of slope reinforced by GFRP anchor; There is no stress relaxation under the long-term effect of loads, and GFRP anchor could still undertake some additional loads; Its stress distribution of GFRP anchors is different from that of steel anchors because of the difference in elastic moduli, and GFRP anchor is more suitable to soil slope reinforcement which usually has larger deformation than rock slope.