Abstract: In order to explore the influence of temperature rise on slurry pipe flow characteristics in the process of large-flow pipeline transportation，parameters such as optimal slurry pipe diameter and initial flow rate were obtained in the high-temperature environment，and the filling slurry transportation L-pipe model was established.Based on the rheological test，the plastic viscosity and yield stress of slurry were obtained.The velocity field characteristics of different temperature， pipe diameter and initial velocity in high temperature environment were analyzed by using COMSOL numerical simulation software.The results showed that the yield stress and plastic viscosity of the slurry decreased with the increase of temperature.At the junction of the bend pipe and the horizontal pipe， the flow pattern is not stable， and the slurry velocity layer changes greatly. The advance of the plug flow is transformed into the flow mode of increasing the speed from top to bottom， which is easy to cause pipe blockage and burst.When the temperature is 40 ℃， 50 ℃ and 60 ℃， the radial length of the maximum flow core is 0.09 m， 0.07 m and 0.05 m， respectively， with a decrease rate of 22.2% and a corresponding increase in the maximum flow velocity. When the temperature is 40 ℃， the maximum radial flow velocity is 2.978 m/s， the temperature is increased to 60 ℃ and the maximum flow velocity is increased to 3.135 m/s.When the pipe diameter is 200 mm and 240 mm， the radial length of the maximum flow zone is 0.1 m and 0.12 m， respectively. The maximum flow rate decreases accordingly. The pipe diameter increases from 200 mm to 240 mm， and the maximum flow rate changes from 2.977 m/s to 2.876 m/s.With the increase of inlet velocity， the area of maximum velocity of slurry center increases， which has little influence on the area of plug flow.Based on the experimental research， in order to reduce the loss of conveying resistance and improve the benefits of the mine， it is suggested to select the parameters of conveying slurry in the mine: temperature 40~50 ℃， pipe diameter 200 mm， and initial flow rate 2.5 m/s.The above analysis results can provide certain theoretical basis for the actual mine filling design and further study on the flow pattern of pipeline transportation.

Key words: filling mining, paste, high temperature, large flow, numerical simulation, tube flow characteristics