Influence of Fine Sand Mixture on Yield Value and Critical Shear Stress of Cohesive Sediment

Abstract

Water content is the most important parameter for rheological property of cohesive sediment. Mud in estuary often contain 10-70% fine sand and mixture of sand considerably influences rheology of mud. Vane tests were conducted for measuring the yield stress of mud and it was found that the yield stress decrease by mixture of fine sand. In flume experiments for initial movement of mud bed, it was found that the increase of sand content causes the decrease of critical shear stress.