级配和含盐度对钾长石质粉砂的静水沉降影响试验研究OA北大核心CSTPCD

Fine-grained sediment is prone to flocculation during settling process.The occurrence of flocculation can be influenced by multiple factors such as particle size,salinity,particle size grading,mineral composition,water temperature,and sediment concentration.The silt with potassium feldspar is taken as an example,an experimental study has been conducted to investigate the effects of sediment particle size and its gradation,and salinity on settling process in hydrostatic water.The results show that the critical size for flocculation of potassium feldspar silt in fresh water is about 30 μm and it can reach to 50 µm in saline water.The optimal salinity for flocculation is 15 ppt,but the flocculation index varies among different sediment particle size:Salinity has a greater impact on fine sediment with particle size less than 50 pm,and the flocculation is more significant.Coarse particles above 50 μm do not undergo flocculation.The coarse sediment is generally dominated by single-particle settling,while fine sediment is flocculated with particle aggregation.