Enhancing Rockfall Impact Test Standards: A Novel Approach for Accurate Velocity Measurement and Structural Optimization of Test Platforms

Abstract

Rock Fall Impact Test Method and Evaluation of Railway Slope Flexible Passive Protection Products" TB/T3449-2016 is one of the most important test standards for slope flexible protection network systems more attention. However, there have been some problems in the implementation of the standard. In this paper, a method of calculating the velocity of falling rock hitting the net and determining the impact height when the average velocity of the test block within the last 1m distance from the impact point of falling rock is ≥25m/s is proposed by using Newton's second law and conservation of energy considering the air resistance, which solves the problem of difficult and inaccurate measurement of falling rock velocity in the standard. Then, it is pointed out that the buffer distance energy, which has been neglected for a long time in the calculation of shock energy, can be solved by setting the deviation of the test energy level. Finally, through the investigation and analysis of different structural forms of rockfall impact test platforms, it is proposed that the steel structure rockfall impact test platform is better, and it is suggested that the next revision of the standard should increase the requirement of the structural form of the test platform.