The interfacial friction resistance between cohesive soil and concrete was studied by large-scale direct shear apparatus,and the relationship between shear rate and shear failure displacement was measured under different shear rates and normal stress.The results show that the shear stress-shear displacement relationship at the interface between cohesive soil and concrete is influenced by shear rate and normal stress.Shear rate has no influence on interfacial adhesion and interfacial friction angle,and there is no obvious correlation between interfacial shear failure displacement and shear rate,but shear rate has some influence on pile-soil interfacial shear failure displacement.Therefore,the shear rate has little effect on the mechanical properties of pile-soil interface within the range of pile driving speed of static pressure pile.
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