Contact sediment with thick layers of various stiffness was investigated by the Burmistr. He received an equation similar to the bunses, but with the number of influence, which is the function of the power of the formation, the width of the foundation and its length, as well as the relationship of elastic constants of materials. The pressure acting on the sole of the foundation on the ground is called contact pressure. It is of essential importance in calculating the design of the foundation itself, since it determines the distribution of moments and transit forces in it. This requires such flexibility of the foundation so that it can follow the deformation of the soil. If the flexible foundation were suddenly replaced by a hard, which carries the same load, then an immediate change in the distribution of contact pressure would occur: it would increase at points with small precipitation and decreased at points with large precipitation, until it would come to such a contact pressure epic, which causes uniform sediment. Calculation by Bossinnes for a hard round foundation leads to a distribution. Under the middle of the foundation, this pressure is half the average and increases to the edges, where it theoretically becomes endless. In fact, the soil in these areas of high stresses experiences a local shift, which leads to the appropriate plastic redistribution of contact pressure. Contact pressure diagram under a rigid foundation on incoherent soil. This pressure is larger under the center and decreases towards the edges of the foundation. Testing of foundations up to 1 w wide on sandy soils, carried out by Kugler and Shaidig, shows that the contact pressure with rigid foundations on incoherent soil becomes uniform with an increase in the width of the foundation and the depth of its laying.
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