The time effect of soil deformation reflects the unification of soil consolidation and rheology

and that is

the soil rigidity itself has time effect. Through the analytical method

the rigidity matrix of building foundation considering time effect has been established; and thus the calculation of the rigid foundation is solved with program. The working mechanism of the rigid foundation

such as the contact pressure and deformation

has been demonstrated. Initially

the settlement and contact pressure of the foundation develop quickly in the beginning of loading

and then slow down. Along with the time growth

the settlement still increases

also

the contact pressure increases in the corner of foundation and decreases in the center

and gradually tends to be stable. Finally

the distribution curve of the counterforce acting on foundation is characteristic of a saddle-like shape

which is higher in the edges and lower in the center.