The foundation is a homogeneous and isotropic semi-infinite linear deformation, and the stress in the soil can be calculated according to the elastic theory.

Under the action of pressure, the foundation soil does not produce lateral deformation, and the compressibility index under lateral limit condition can be adopted.

2. Settlement calculation of single compressed soil layer

When a continuous uniform load is applied to a soil layer with a certain uniform thickness, the vertical stress increases, the void ratio decreases accordingly, and the soil layer is compressed and deformed without lateral deformation.

In order to make up for the error caused by the assumption, the additional stress under the central point of the basement is calculated, and the settlement of the central point of the basement represents the average settlement of the foundation.

3. Definition:

Firstly, the foundation soil is divided into several soil layers, and the thickness of each layer is H 1, H2, H3, ..., HN. Calculate the compression of each layer of soil S 1, S2, S3, ..., Sn. Then add up, that is, the total foundation settlement S.