Experimental Study of the Shear Behaviour of the Contact Surface Between a Frozen Chalk Structure and a Foundation Under the Influence of Roughness

Bearing capacity of a pile foundation depends mainly on the magnitude of the pile-side freezing force. The magnitude of the pile-side freezing force is affected by a variety of factors, among which the roughness of the pile body is an important influencing factor. In this paper, the freezing strength problem of the pile-soil contact surface is transformed into the shearing strength problem of the frozen soil-concrete contact surface. The shear characteristics of the permafrost-concrete contact surface are investigated by a large-scale straight shear test. The results show that the peak shear strength at the contact surface increases with increasing roughness. The increase in contact surface roughness has a more pronounced effect on cohesion, while the effect on the angle of internal friction is relatively small.