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N

normal compression line (NCL)
normal force (N N')
normal strain (en)
normal stress (s, s')
normalisation
normalising parameters (p'c p'e s'c s'e)
normally consolidated soil

normal compression line (NCL)

The relationship between void ratio (or specific volume) and (mean) normal effective stress for soil loaded beyond the current yield stress in one-dimensional (or isotropic) compression.

normal force (N, N')

Force acting normal to the plane of reference. Units: kN, N or MN.

normal strain (en)

Direct strain acting normal to the plane of reference.

normal stress (s, s')

Stress acting normal to the plane of reference. Units: kPa, kN/mē

normalisation

Analysis of soil test data to compensate for different states of samples.

normalising parameters (p'c p'e s'c s'e)

(Also equivalent stresses) Parameters used in the normalisation of shear test results: a stress value on either the CSL or NCL having the same specific volume or void ratio value as the current state value.

normally consolidated soil

Soil having a current state which lies on the normal compression line:
· current normal effective stress equals current yield stress
· overconsolidation ratio Ro = 1
· generally: "current stress equals maximum stress in the past"