关键词: 膏体;倾斜管道;自流输送;水力坡度

Abstract: The influence factors of the hydraulic gradient of the paste pipeline transportation was analysized by the test results of the paste pipeline transportation with the dip angle of 40 degrees, 50 degrees and 60 degrees, and studys the relationship between the yield stress and the paste concentration and the relationship between stiffness coefficient and paste concentration . Based on the calculation formula of hydraulic gradient of horizontal pipeline , through analysis it is found that the decrease of hydraulic gradient relative to the horizontal pipeline is related to the number of Froude number , the concentration of slurry and the inclination of pipeline .Through analyzing the influence law of above parameters for on hydraulic gradient reduction function , gives the expression of gradient reduction function, thus gives the calculation model of hydraulic gradient for paste gravity flow in inclined pipe . The model was tested by the results of 70 degree angle paste transfer test , and the maximum deviation between the model calculating value and test value was found to be less than 12％.

Key words: paste;inclined pipe;gravity transportation;hydraulic gradient