基于响应面法的淤泥基陶粒吸水性变化及其入渗特性研究OA

To investigate how different preparation parameters affect the water absorption capacity of sludge-based ceramsite,as well as the changes in infiltration properties of typical soils following the application of ceramsite,sludge collected from the reservoir area of a representative reservoir in Shanxi Province was selected as the primary raw material,supplemented with corn straw and clay.Using raw material proportion,calcination temperature,and calcination duration as independent variables,a three-factor,three-level Box-Behnken Design(BBD)experiment was conducted.The 1-hour water absorption rate and saturated water absorption capacity of the ceramsite were then measured to evaluate the impact of each preparation parameter on water absorption performance.Based on these results,ceramsite with a high water absorption capacity was applied to the soil surface for soil column infiltration tests,during which wetting front migration distance,cumulative infiltration volume,and infiltration rate were measured to analyze the resulting changes in soil infiltration characteristics.The results indicate the following:① The influence of different preparation factors on the water absorption of sludge-based ceramsite decreases in the order of calcination temperature>raw material ratio>calcination time.Additionally,the interaction between calcination temperature and raw material ratio is relatively significant.When the preparation factors are set to a mass ratio of sludge,straw,and clay of 55:35:10,a calcination temperature of 1150℃,and a calcination time of 60 minutes,the sludge-based ceramsite exhibits high water absorption,with measured 1-hour and saturated water absorption values of 70.02％and 72.43％,respectively,and fitted values of 72.65％and 75.21％.②Applying a sludge-based ceramsite layer slowed the advancement of the wetting front,extending the infiltration time by 30 minutes,increasing cumulative infiltration by 103％,and raising the initial soil infiltration rate by 36.7％.The infiltration model fitting results for the water movement process showed R² values ranging from 0.958 to 0.998,indicating an accurate simulation of the infiltration process.③Applying sludge-based ceramsite increased the average soil moisture content by 9.5％and reduced the variability of soil moisture with depth.Overall,the water absorption capacity of sludge-based ceramsite is significantly influenced by the raw material ratio and firing temperature.Additionally,adding high water-absorption ceramsite can effectively enhance soil infiltration and water-holding capacity.These findings provide valuable technical support for mitigating soil and water loss on the Loess Plateau and for expanding the resource utilization of sludge.