Environmental Engineering Reference
In-Depth Information
The work capacity and the related damage increase following the potential
capacity and speci
c volume become larger. When the explosive properties and
packed mass are given, the effect action distance is related with the geometry and
detonation methods.
According to isentropic law of detonation production expansion, the theoretical
work capacity of an explosive is below.
dA
¼
dE
¼
C
v
dT
Because
nR
k
C
v
¼
1
So
nRT
D
k
T
1
T
D
A ¼
1
ð
2
:
91
Þ
1
¼ c (constant), Tv
k
1
If A is the work of per kilo gram explosive, and Pv
k
¼
constant and T
k
p
1
k
¼
constant, the
final equation of work is eq.
2.92a
"
#
"
#
¼
k
1
k
1
F
k
T
1
T
D
F
k
v
D
v
1
F
k
P
1
P
D
k
A ¼
1
1
¼
1
ð
2
:
92a
Þ
1
1
1
c volume and pressure inde-
pendently of explosion. T
1
, v
1
, and P
1
are the temperature, speci
Here, T
D
v
D
and P
D
are the temperature, speci
c volume and
pressure independently in expansion process.
F ¼ nRT
D
is the power of an explosive. n is the mole number of gas products
from 1 kg explosive.
R ¼ P
0
V
0
=
273, P
0
is the air pressure, V
0
is the standard volume of 1 mol gas. If
the unit of P
0
is atm, V
0
is liter, the unit of F is (L atm)/kg.
When the expansion of explosion products is unlimited, P
1
= P
0
, T
1
= T
0
,
V
1
= V
0
.
A ¼ A
max
¼ IQ
w
ð
2
:
92b
Þ
Here, I is the heat work equivalent; A
max
¼ IQ
w
is the potential energy of an
explosive.
Equation
2.92b
assumes that all explosion products are gases. If the explosion
products are not only gases, they have gases, solids, and liquids, A
max
\
IQ
w
. In the
