Constrained dilatancy as a factor of load-holding capacity of deep foundations
This chapter treats certain properties of technologies in their interconnection with the load-holding capacity of piles, footings and injection anchors. These constructions are distinguished by similarity of technological methods and approaches to the design of their load- holding capacity represented by a broad spectrum of methods ranging from purely theoretical to completely empirical. A distinctive feature of modern technologies of deep foundations is their active effect on soil properties. Piles of the type I are the most widely used in post-Soviet foundation engineering. Available drilling equipment allows to make holes with the diameter of up to 0.8–1.2 m, rarely with larger diameters. Technological inadequacies and great scatter of received values of contact friction and bearing capacity also make it difficult to generalise empirical data. Vagueness in the evaluation of properties of the clay layer generates apprehensions as to the potential decrease in its strength as compared to natural soil.