The question of assigning a bed coefficient in calculating rigid airport pavements

It is suggested that the bed coefficient be considered as a characteristic of the contact interaction of rigid pavement and the soil base. Equations are derived for the relationship between the bed coefficient and the modulus of elasticity of the soil base for reinforced-concrete and metal pavements. They are compared with the results of experimental investigations, indicating sufficiently good correspondence of these values. Patterns of operation of pyramidal piles in swelling soils are given: the dependence of their rise on the cone angle, length of the pile, and transmitted load. The authors studied layer-by-layer displacements of soil around a pile and give their dependences on the depth of the layer's location. Formulas are given for determining the coordinate of the neutral point, according to which the rise of an unloaded pile is found.