Page 21 - Analysis and Design of Energy Geostructures

xxii List of symbols

Roman symbols
Symbol Variable name Unit measure
Mean stress Pa
p
0 Mean effective stress Pa
p
0 Constant mean effective stress Pa
p
Atmospheric pressure Pa
p a
0
Isotropic effective preconsolidation stress Pa
p
c
0 Isotropic preconsolidation stress at reference temperature Pa
p c0
0
Critical effective stress Pa
p
cr
0
Preconsolidation pressure at the end of the cooling phase Pa
p
cool
0
Equivalent effective pressure Pa
p
e
Fluid pressure Pa
p f
Contact forces Pa
p i
0
Mean effective stress at reference point Pa
p
ref
Pore water pressure Pa
p w
World population
pop
Base capacity N
Q b
Design value of base capacity N
Q b;d
Mobilised base capacity N
Q b;mob
m Mechanical contribution of mobilised base capacity N
Q
b;mob
Thermal contribution of mobilised base capacity N
th
Q
b;mob

Variable load N; C
Q k

Q k;1 Dominant variable action or action effect N; C
Energy required from the piles J
Q R
Single variable mechanical load N
Q rep
Shaft capacity N
Q s
Energy supplied by the heat pump J
Q S
Design value of shaft capacity N
Q s;d
Equivalent shaft capacity N
Q s;eq
Mobilised shaft capacity N
Q s;mob
Mobilised shaft capacity below the null point N
Q s;mob;down
Mobilised shaft capacity above the null point N
Q s;mob;up
m Mechanical contribution of mobilised shaft capacity N
Q
s;mob
Thermal contribution of mobilised shaft capacity N
th
Q
s;mob
Thermal contribution of mobilised shaft capacity below null point of N
th
Q
s;mob;down
shear stress
Thermal contribution of mobilised shaft capacity above null point of N
th
Q
s;mob;up
shear stress
Design ground source heat pump system heating capacity W
Q h
Head action N
Q h
Ultimate capacity N
Q u
Design value of ultimate capacity N
Q u;d
Block capacity of a pile group N
Q u;b
Equivalent base capacity N
Q u;eq
Experimentally determined pile axial capacity N
Q u;exp
Thermal power W
_ Q
Thermal power by convection W
_ Q conv
Installed power W
_ Q inst
Required thermal power W
_ Q R