B
bearing pressure (q)
bedrock
boulders
British Soil Classification System
bulk density (r)
bulk modulus (K')
bulk unit weight (g)
bearing pressure (q)
 The total stress transferred from the
underside of a foundation to the soil below. Units: kPa
bedrock
Rock underlying surface deposits of soil and weathered or broken rock; usually material which is so stiff and strong that it is easily able to carry foundation loads.
boulders
Soil grains over 200mm in size.
British Soil Classification System
A system of classification based on size, consistency and structure, set out in BS 5930:1981 Site Investigation.
bulk density (r)
The total mass of soil particles and water contained in a unit volume of soil. Units: Mg/m³
r = (Ms + Mw) / V
where
Ms = mass of soil grains
Mw = mass of water
V = total volume.
bulk modulus (K')
 The ratio of a change in applied mean
normal effective stress to the resulting change in volumetric
strain. Units: kPa
bulk unit weight (g)
 The total weight of soil grains and
water in a unit volume of soil. Units: kN/m³
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