Mechanism of Abrasion to Material by High-velocity Sediment-laden Flow and Effect of Aeration on Abrasion Resistance

The surface material is liable to abrasion by highvelocity sediment-laden flow.In this paper,the mechanism of sand abrasion is discussed and some effects of significant flow factors on material wear are analyzed;Based on the turbulence theory,formulas are derived for predicting the abrasion rate of concrete material wall surface.Based on the test data and regression analysis,an empirical formula is proposed to estimate the abrasion rate of concrete material for high-velocity sediment-laden and aerated flow.It is indicated that the wear rate is related to air concentration,strength of material,flow velocity and sediment concentration.The method of preventing abrasion with aeration is presented.It is shown that the abrasion rate can be reduced with the help of flow aeration.