Abstract:

The main purpose of this study is to investigate the rheological characteristics and resistance evolution behavior of tailing-waste rock paste backfill. A Brookfield R/S+ rheometer was used to test and study the rheological parameters of the paste, and a formula for calculating the transport resistance considering volume concentration, bulk density, and water-cement ratio was established. Secondly, the above formula was put into Comsol to build a numerical model, and the filling loop test data was used to compare and verify the error of the numerical model was less than 8%, proving the numerical model's reliability. Finally, the effects of different tail-waste ratios, inlet velocities, and concentrations on conveying resistance were analyzed, and the optimal filling parameters were obtained: tailing-waste rock ratios 5:5, initial velocity 2.2 m·s^-1. The research results of this paper have positive significance for developing coarse aggregate paste transportation technology, reducing pipeline transportation resistance, and extending transportation distance.

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Shenghua YIN