Explosion Features of Liquid Explosive Materials - Liquid Explosives - page 95

Fig. 2.45 Explosion of liquid explosives in semiclosed space

D P 1
D P 1 þ

6

7P 0 cos 2

D P 2 ¼

ð 1 þ cos u Þ D P 1 þ u 1

90 , Mach re

(3) when u 1c \ u 1 \ fl ection and irregular re fl ection

ð þ u 1 Þ

D P m ¼ D P fG 1 cos

Here, D P m is the super pressure of Mach re fl ection; and D P fG is the super

pressure of ground explosion.

2.4.3.2 The Damage of Semiclosed Targets from Air Shock Waves

The shock waves of liquid explosive explosion propagate inside the semiclosed
space, release energy produce pressure for the semiclosed space. The shock waves
destroy and injure the surrounding targets at different degrees. The damage and
destruction of targets under explosion shock waves are a very complex process.
The disturbance/perturbation of shock waves induces high pressure, which destroys
the vulnerable spots in the semiclosed space, e.g., windows, air chimneys, crafts,
etc. The destructiveness is related not only with shock waves, but also with the
shapes, intensity, and resilience of targets. The explosion of liquid explosives in
semiclosed space is shown in Fig. 2.45 .
In Fig. 2.45 , 1,800 kg liquid explosives are exploding in 120 m 3 semiclosed
room constructed by concrete-steel. The super pressure of shock waves from the
explosion reaches 1.83 MPa. The high pressure lashes and devastates the targets
inside the building. At the same time, being affected by the re

ection, the high-
pressure shock waves disturb the targets inside the building. The tremendous
pressure difference between in and out of the building destroys windows, doors, etc.
and other vulnerable parts. Figure 2.45 indicates that the destruction of windows
and doors from liquid explosives is thorough. The damage of soft targets inside the
building is hardly avoidable.

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