Based on engineering fluid mechanics and the mechanical model of particle transportation, discrete particle model and ductile impact erosion model were applied for investigating pipe impact erosion influenced by slurry characteristics in complex backfilling pipeline in a mine, aiming to study the impact erosion mechanism of backfilling pipe during transportation. The results show that pipe impact erosion was largely influenced by slurry velocity, viscosity and particle size, while slightly influenced by particle shape. At high flow velocity, compared with straight pipe, in which the erosion zone is distributed relatively uniformly in the pipe wall, the bended pipe had the most serious impact erosion zone with the maximum erosion value in the range of 15°-30°and 60°- 75° at low flow velocity, the main impact erosion zone transferred to the exit of the bended pipe. The erosion increased with increase of particle size when the particle had a small diameter, but decreased when the particle reached the diameter of 600 μm.

backfilling pipe  /  impact erosion  /  discrete particle model  /  ductile impact erosion model  /  slurry characteristics