| Hobbs, P R N, Entwisle, D C, Northmore, K J, Sumbler, M G, Jones, L D, Kemp, S, Self, S, Barron, M, and Meakin, J L. 2012. Engineering Geology of British rocks and soils - Lias Group. British Geological Survey, Nottingham, UK. (OR/12/032).
|
Formation abbreviations for geotechnical data
| BDS
|
Bridport Sand Formation
|
| BLI
|
Blue Lias Formation
|
| BNLS
|
Beacon Limestone Formation
|
| CDI
|
Cleveland Ironstone Formation
|
| CHAM
|
Charmouth Mudstone Formation
|
| DYS
|
Dyrham Formation
|
| MRB
|
Marlstone Rock Formation
|
| RMU
|
Redcar Mudstone Formation
|
| SMD
|
Scunthorpe Mudstone Formation
|
| WHM
|
Whitby Mudstone Formation
|
Glossary of geotechnical abbreviations & units
| Parameter
|
Main
|
Alternative(s)
|
Units
|
| Liquid limit
|
wL
|
LL
|
%
|
| Plastic limit
|
wP
|
PL
|
%
|
| Plasticity index
|
IP
|
PI
|
%
|
| Modified Plasticity index
|
IP'
|
|
%
|
| Liquidity index
|
IL
|
LI
|
-
|
| Bulk density
|
gb
|
BD
|
Mg/m3
|
| Dry density
|
gd
|
DD
|
Mg/m3
|
| Particle density
|
gp
|
PD
|
Mg/m3
|
| Natural water content
|
w
|
NWC, NMC
|
%
|
| Voids ratio
|
e
|
|
-
|
| Clay-size fraction
|
%CLAY
|
CLAY
|
%
|
| Silt-size fraction
|
%SILT
|
SILT
|
%
|
| Sand-size fraction
|
%SAND
|
SAND
|
%
|
| Gravel-size fraction
|
%GRAVEL
|
GRAVEL
|
%
|
| Activity
|
AC
|
|
-
|
| Linear shrinkage
|
LS
|
|
%
|
| Total sulphate
|
SO4 (tot)
|
T.Sul.
|
%
|
| Aqueous sulphate
|
SO4 (aq)
|
A.Sul.
|
g/l
|
| Sulphate in groundwater
|
SO4 (w)
|
W.Sul.
|
%
|
| Acidity
|
pH
|
PH
|
-
|
| Organic content
|
ORG
|
|
%
|
| Carbonate content
|
CARB
|
|
%
|
| Acid soluble Chloride
|
CHL (as)
|
|
%
|
| Water soluble chloride
|
CHL (ws)
|
|
%
|
| Moisture Condition Value
|
MCV
|
|
%
|
| Maximum Dry density
|
MDD
|
|
Mg/m3
|
| Optimum Water Content
|
OWC
|
OMC
|
%
|
| California Bearing Ratio
|
CBR
|
|
%
|
| Permeability
|
k
|
|
m/s
|
| Coefficient of volume compressibility
|
mV
|
|
m2/MN
|
| Coefficient of consolidation
|
cV
|
|
m2/yr
|
| Compression index
|
CC
|
|
-
|
| Swelling index
|
Ce
|
|
-
|
| Triaxial
|
TX
|
TRIAX
|
|
| Shear-box
|
SH-BX
|
SHB
|
|
| Triaxial - Total cohesion
|
cu
|
TX-Cu
|
kPa
|
| Triaxial - Effective cohesion
|
c'
|
TX-C
|
kPa
|
| Triaxial - Effective friction angle
|
Φ'
|
TX-PHI
|
degrees
|
| Shear box - Peak cohesion
|
cp
|
SHB-Cpeak
|
kPa
|
| Shear box - Residual cohesion
|
cr
|
SHB-Cresid
|
kPa
|
| Shear box - Peak friction angle
|
Φ'p
|
SHB-PHIpeak
|
degrees
|
| Shear box - Residual friction angle
|
Φ'r
|
SHB - PHIresid
|
degrees
|
| Standard Penetration Test
|
SPT
|
|
N, blows/300 mm pen.
|
| Uniaxial compressive strength
|
UCS
|
|
MPa
|
| Young's modulus
|
E
|
|
MPa
|
| Poisson's ratio
|
n
|
|
-
|
| Sonic velocity (P-wave)
|
vp
|
Vel (p)
|
m/s
|
| Sonic velocity (S-wave)
|
vs
|
Vel (s)
|
m/s
|
| Point load index
|
IS50
|
PT-LOAD
|
-
|