Study on the rheological model and flow state of paste-like fill slurry

Based on the experiment and analysis of rheological characteristic, the rheological model and the flow state of paste-like fill slurry with alluvial sands and fly ash as aggregate are researched. The result shows that the rheological model is similar to Bingham plastic fluid, and the flow state in pipeline transportation is laminal flow. Considering the fluidity, homogeneity and dewatering rate of the slurry, the proper slurry density is 77% to 78%, and the suitable content of fly ash in the slurry is about 20%.