Application of a spiral pipe in a low stowing gradient backfilling pipeline and amendment of stowing gradient

In order to solve the high pressure and serious worn problems at some sections in a low stowing gradient backfilling pipeline, this article introduces a new solution of spiral pipes to regulate the resistance and pressure. The regulator of increasing resistance and its implementation plan are analyzed by using the CFD technique. An amended formula for calculating the stowing gradient is presented by adding spiral increasing resistance based on the simulation. It is shown that, when the transportation speed is 2 m·s^-1, the unit-height resistance of the spiral pipe can be 10.1 to 16.8 times that of the straight pipeline. This apparatus can fully guarantee the continuous conveying of slurries, and it can also increase the resistance and reduce the pressure effectively. The amended formula can figure out the effective stowing gradient of the backfilling pipeline with spiral apparatus more accurately.