Analysis of Application Effect of Upper Locking Double Layer Nonlinear Fasteners in Nanjing Metro

In this paper, the vertical and transverse frequency response characteristics of steel rails under two track structure III fastener and upper locking double-layer nonlinear fasteners (GJ-32 fasteners) are compared by online detection and hamming method on the line of normal operation of subway tunnel from Shuanglong avenue to Nanjing South Station of Nanjing Metro Line 1. The results show that: (1) The GJ-32 fasteners has a better inhibitory effect on rail vibration between 200-400 Hz compared with the III fastener; (2) The GJ-32 fasteners has better damping performance and damping characteristics; (3) The development of corrugated rail of III fastener is serious, and the growth of corrugated rail is effectively inhibited by the upper locking double-layer nonlinear fasteners.