Surface Vibration of Throw-Type Blast in an Open-Pit Mine

Abstract In the process of Open-pit mining in China, throwing blasting is an important method, which very likely to cause serious damage slope discharge field under action vibration load blasting. With background Heidaigou open-pit mine Ordos, velocity data were collected from near blast, and signal blast was analyzed by means Fourier transform obtain characteristics wave attenuation law prediction formula propagation. The results show that: 100 ~ 300 m away area, radial direction (X direction) area produces largest 26.8 cm/s, but at same time, decay rate peak survey line 2 each small, percentages 56, 75 70% are smaller than that 1 3 lateral as propagation As distance increases, decreases. curve gradually tends flatten three directions close. frequency band distributed within 200 Hz energy mainly low stage (0–20 Hz), accounting for more 50% total energy.