Abstract: In order to improve the durability and impact resistance of debris flow flexible cable net system, a reinforced flexible cable net system combining lightweight, high strength and corrosion resistant carbon fiber reinforced polymer (CFRP) with cable net is proposed. Through nine groups of static tensile tests and numerical simulation with finite element software ANSYS/LS-DYNA, the influence of CFRP material on the static performance of reinforcements is analyzed. The dynamic responses of single cable, composite cable and cable net pasted with carbon fiber cloth under impact loading are also studied. The effect of carbon fiber cloth on impact resistance of the flexible cable net is discussed and compared with that of flexible cable without pasting carbon fiber cloth. Tested results show that in the tensile test, carbon fiber cloth can obviously improve the yield strength of reinforcement, but the improvement of tensile strength is not obvious. In the simulated impact process, the overall stiffness of the steel cable bonded with carbon fiber cloth may be improved to a certain extent, and the displacement is reduced under all levels of impact loads. Carbon fiber sheet can share part of stress of a steel cable without failure. The carbon fiber sheet near the impact point or at the fixed end of the cable is prone to failure, resulting in a “sudden change” in the stress of the cable.

Key words: flexible protective cable net, carbon fiber cloth, impact load, dynamic response, impact resistance