MECHANICAL BEHAVIOR OF GFRP ROCK BOLT FOR PERMANENT SUPPORT OF TUNNEL

  • Jongsung Sim Civil Engineering, Hanyang University, Korea
  • Hyunjoong Kim Civil Engineering, Hanyang University, Korea

Abstract

Rock bolt is widely used to support tunnels because of its various merits such as excellent supporting performance in weak ground foundation, easy workability and easy maintenance. However, rock bolt also has demerit caused by the corrosion of steel failure resulting in the maintenance difficulty. In this study, the
properness of rock bolt as the permanent supporting material for the tunnel is evaluated by analyzing the dynamic behavior of GFRP (Glass-Fiber Reinforce Polymer) rock bolt, which has high tensile strength and high durability. In the experimental study, existing steel rock bolts and the developed GFRP rock bolts were tested for the tensile strength and their behaviors in the weak ground environment were simulated for subsequent shear test. Structural analysis was also done based on the test results and the safety factors were examined by comparing the values with the theoretical values. The research results suggests that the tensile strength of GFRP rock bolts is 141% of existing steel rock bolts while the shear strengths of them were similar. The safety factors through structural analysis shows that GFRP rock bolts have similar safety factor with existing steel rock bolts. It is concluded that the cost for repair and rehabilitation can be saved a lot by using GFRP rock bolts because smaller diameter GFRP rock bolts can be used instead of existing steel bolts, the workability is improved and the corrosion issue would be resolved.

Published
2011-08-01
How to Cite
SIM, Jongsung; KIM, Hyunjoong. MECHANICAL BEHAVIOR OF GFRP ROCK BOLT FOR PERMANENT SUPPORT OF TUNNEL. EACEF - International Conference of Civil Engineering, [S.l.], v. 1, p. 042, aug. 2011. Available at: <http://proceeding.eacef.com/ojs/index.php/EACEF/article/view/384>. Date accessed: 19 may 2024.
Section
Group of Structural and Construction Engineering