The Effect Of Liquid Environmental Protection Dust Suppressant On Runoff And Sediment And Hydrodynamic Characteristics Of Temporary Soil Pile

Temporary soil piling is one of the main sources of soil erosion in production and construction projects.Research on protective measures for temporary soil piling is of great significance to preventing and controlling new soil and water loss in production and construction projects.With the rise of material science,the dust suppressant formed by the polymerization of multifunctional polymer has a certain function of preventing soil erosion.However,its impact mechanism and applicability in the prevention and control of soil erosion are still unclear.In order to explore the effects of liquid environmental protection dust suppressant on the prevention and control of soil erosion on the temporary soil pile slope,this research used artificial simulated rainfall experiments to study the runoff and sediment yield process and hydrodynamic characteristics on the common slopes（15°,20°,30°）of temporary soil pile,and different spraying concentration ratios of“Chen Ke”liquid environmental protection dust suppressant（0,1/100,1/75,1/50）,in order to provide new ideas and materials for the prevention and control of soil erosion in temporary piles,and to provide a scientific basis for the practical application of dust suppressants.Research indicates:（1）The concentration of dust suppressant is the main factor affecting the process of sediment yield and runoff.There are obvious differences in the process and rate of sediment yield and runoff under different concentrations of dust suppressant.Spraying dust suppressant can increase the slope runoff rate and total runoff,but significantly reduce the slope sand production rate and total sediment.Compared with the control group CK,the runoff increased by 4.59%-37.89%,and the sediment reduction benefit was as high as 9.24%-92.85%.The concentration of dust suppressant was extremely significantly negatively correlated with sediment yield rate and yield,significantly negatively correlated with initial runoff time,and significantly positively correlated with runoff rate and runoff.Rain intensity was significantly positively correlated with runoff rate and runoff,significantly positively correlated with sediment yield rate and yield,and extremely significantly negatively correlated with initial runoff time.The slope was only significantly negatively correlated with the initial runoff time,and had no significant correlation with the runoff and sediment yield characteristics.（2）The initial runoff time,runoff rate,cumulative runoff,sediment production rate,and cumulative sediment yield on the slope are all restricted by rainfall intensity,slope,and concentrations of dust suppressant.The initial runoff time,runoff rate and cumulative runoff on the slope are linear functions with rainfall intensity,slope and dust suppressant concentrations,followingtheequationT=648.709-8.391S-5.092R-3.622C,R_i=7.577R+2.954S+5856.73C-31.306.However,the cumulative sediment yield on the slope has a power function relationship with the rainfall intensity,slope and the concentration of the dust suppressant,while the slope sediment production rate has a nonlinear function relationship with the rainfall intensity,slope and the concentration of the dust suppressant,which follows the equation S_i=2.083·1.021^R·1.014^S-353.792C.（3）The dust suppressant can significantly reduce the degree of soil erosion on slopes.There are significant differences in soil erosion rates on slopes with different concentrations of dust suppressant.Overall,the soil erosion rates are CK>1/100>1/75>1/50.Under the rain intensity of 30mm/h,the average soil erosion rate of the group applied with dust suppressants decreased by 49.23%-93.31%（slope 15°）,19.05%-73.81%（slope 20°）,1.72%-75.86%compared with CK（slope 30°）.Under the rain intensity of 60mm/h,the average soil erosion rate of the group applied with dust suppressants was reduced by 29.41%-91.18%（slope 15°）,60%-91.74%（slope 20°）,54.74%-71.58%（slope 30°）,respectively,compared with CK.（4）The dust suppressant has a significant effect on the hydrodynamic characteristics,and different characteristic parameters vary with the concentration of the dust suppressant.On the whole,among the hydraulic parameters,the runoff velocity,Reynolds number,and Froude number all increased with the increase of the dust suppressant concentration,while the Darcy-Weisbach coefficient decreased with the increase of the dust suppressant concentration,while the runoff depth had no effect significant differences.Among the kinetic parameters,both the runoff power and the unit runoff power increased with the increase of dust suppressant concentration,while there was no significant difference in the slope runoff shear force.（5）Soil detachment rate and hydrodynamic parameters can be described by a linear function relationship.The unit water flow power is the best hydrodynamic parameter to describe the soil detachment rate on the simulated temporary soil pile slope.Dust suppressants can significantly reduce soil erodibility coefficient,increase critical runoff shear force,critical runoff power and critical runoff unit power of slope flow,enhance soil corrosion resistance,and thereby reduce soil erosion.