Abstract
1. The basic factors governing the depth Ha of the deformation zone in the beds of annular foundations are the area of the lower surface, the pressure, the ratio of the inside and outside radius, and the strength properties of the soils. 2. The computational scheme proposed for determination of Ha in single-layer and multiple-layer beds of annular foundations makes it possible to account for soil indicators γ, c, and ϕ, and the average additional pressure on the lower surface, the geometric parameters, and the depth of embedment of the foundations. 3. An annular foundation with r1/r2≤0.4 is recommended for computation as a foundation with a circular radius r2.
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