## Abstract

The pressure in the pore water in a fully saturated soil is hydrostatic, i.e.

*u*_{H}=*u*_{V}=*u*so there is only one value. The pressure within the mineral grain structure (effective stress) is not the same in all directions. The vertical effective stress in a soil can be obtained from simple considerations of depth multiplied by the bulk or submerged unit weight and is treated as a principal stress,*σ*_{V}′. For the design of vertical walls the horizontal stress acting*σ*_{H}′ is required and a coefficient of earth pressure,*K*is used to relate the two stresses:$$K = \frac{{{\sigma _{\text{H}}}^\prime }}{{{\sigma _{\text{V}}}^\prime }}$$

(11.1)

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## Copyright information

© G. E. Barnes 1995