The value of precipitation is: what you need to know and take into account

If the load changes in several separate steps, as, for example, when a pouring is first made on the site, on which after a while the structure is built, it is recommended to calculate the sediment also with steps to know its size at each stage of construction. However, if the construction occurs quite quickly and the intervals between the individual stages are so insignificant that the change in the porosity coefficient for these breaks is small, you can algebraically summarize the voltage increments at each stage of construction and calculate the total sediment immediately. The calculation of the sediment performed on the basis of the results of compression tests is based on the assumption that the soil does not experience transverse deformations during consolidation. This really takes place during a compression test when the soil is limited by a hard metal ring. In kind, this happens only in cases where the thin compressed layer is located between the layers of sand or gravel or when the loaded area is very large compared to the thickness of the sealing layer. However, when the compressed layer is powerful and not limited from the sides, transverse deformations can significantly affect the value of precipitation, depending on the history of the stress state and the nature of the compressed layer itself. The semi -empirical amendment was proposed for these conditions by Skempton and Bierrum. It depends on the coefficient of pore pressure A, which is obtained with drained three -axle tests for strength, and can be determined from the consideration of the history of the stress state of soil. The correction coefficient C is determined based on the values ​​and for various relationships of the power of the layer to the width of the foundation.