Structural Characteristics and Behavioral Analysis of a Buffer Net Applied to Debris Flow Protection Facilities

초록

This study aims to evaluate the impact mitigation performance of net structures applied to debris-flow protection facilities, as debris-flow damages have increased due to recent episodes of extreme rainfall and the demand for protective facilities has consequently grown. Tensile tests were conducted on 16-mm-diameter, 2.0m long wire ropes, comparing the energy absorption capacity of conventional wire ropes with that of buffer-type wire ropes combined with extension springs (spring diameter: 15mm, spring constant: 69.4kN/m). In addition, free-fall numerical simulations were performed using the Abaqus program to analyze the impact response of conventional nets and shock-absorbing nets. The tensile test results indicate that the buffer-type wire rope exhibits approximately 1.76times higher energy absorption per unit length than the conventional wire rope. The numerical analysis further revealed that, under identical impact conditions, the maximum tensile force acting on the shock-absorbing net was reduced to about 25% of that of the conventional net, while the impact duration increased by approximately 60%. Therefore, the shock-absorbing net is considered a more effective and safer alternative for debris-flow protection facilities compared to conventional net systems.

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