Abstract: The rheological properties of two series of paste slurry are researched by L-type pipeline. According to the research results, the rheological properities of paste can be analyzed qualitatively by L-type pipeline, however, some research results are not consistent to the universal point of view. The perfect backfill blending ratio is proposed in line with the maximum stowing gradient that is allowed to gravity transport and the layout of the backfill pipeline in mine.

Key words: L-type pipeline, Paste, Rheological properties, Stowing gradient, Gravity transportation