What are the stresses in subsoil? Give the relation between these

Stresses in Sub-Soil: normal stress (σ) and shear stress(τ)

Stresses in sub-soil are caused by:

(i) Self-weight of soil

(ii) Structural load on the soil

Stresses developed in saturated soil are:

(i) Effective stresses

(ii) Neutral stresses

(iii) Total stresses.

The relation between normal stress and shear stress is that, when a force is acting at an angle of  90 degrees i.e perpendicular to the surface of an object, it exerts normal stress and when a force acts parallel to the surface of an object, it exerts shear stress.