Page 19 - Analysis and Design of Energy Geostructures

xx List of symbols

Roman symbols
Symbol Variable name Unit measure

J 1 ;J 2 ;J 3 Invariants of the deviatoric stress tensor Pa
Average value of the relevant coefficient of lateral pressure
K
Slope of loading/unloading elastic branch of base load-displacement Pa/m
K b
function
Pile stiffness Pa/m
K EP
Gauge factor 1/Hz 2
K g
Head stiffness of superstructure or connected structural element Pa/m
K h
Far-field normal stiffness Pa/m
K int
Coefficient of local losses
K L
Passive earth pressure coefficient
K p
Bulk modulus at a reference point Pa
K ref
Slope of loading/unloading elastic branch of shaft load-displacement Pa/m
K s
function
Stiffness of slab Pa/m
K slab
Slab soil stiffness ratio
K ss
K 0 Coefficient of earth pressure at rest
Hydraulic conductivity m/s
k
Aspect ratio coefficient
k AR
Thermal constant
k B
Horizontal hydraulic conductivity m/s
k h
Slope of straight line C
k sl
Factor depending on the duration of the load
k t
Shape factor
k sr
k 1 Coefficient associated to the design problem of shear
k 0:85 Hydraulic conductivity for a void ratio of 0.85 m/s
k ε Factor of the internal nonuniform self-equilibrating stresses
i Intrinsic permeability m 2
k
Length of pile m
L
0 Length of pile after the application of temperature variation m
L
Effective length of pile m
L eff
Width of pile group m
L g
Pipe length m
L p
Total required thermally active length of energy piles m
L tot
Length of segment m
L seg
Length of slab m
L slab
Length of the ground layer m
l i
Length of optical fibre m
l OF
Moment Nm
M
Critical state parameter
M c
Design value of acting moment Nm
M Ed
General constitutive tensor of the material Pa
M ijkl
kg
Mass i
M i
Limiting design moment Nm
M lim
Design value of resisting moment Nm
M Rd
Kozeny coefficient
M s
Intercept constant C
m sl
Coefficient 1/Pa
m t
Compressibility coefficient 1/Pa
m v