Environmental Engineering Reference
In-Depth Information
After the above discussion, we already have enough understanding and theo-
retical basis for under-pressure detonation. There are two prerequisites for under-
pressure detonation.
(1) The
final state Hugoniot curve is not the top boundary of covered area by
frozen Hugoniot curve groups. Under-pressure detonation never occurs if the
first prerequisite is not met.
(2) Under-pressure detonation only occurs when Rayleigh line passes
Σ
= 0, at the
same time
ʷ
=0.
The work passes of liquid explosives are different from that of condensed
explosives. The under-pressure detonation makes detonation overpressure value
larger than that of condensed explosives. So the detonation of the hydrazine-urea
nitrate liquid explosive is more powerful than HMX. These are the detonation
features and advantages of some liquid explosives.
2.3 Explosion Work Ability of Liquid Explosives
The high temperature and pressure products of liquid explosives violently lash
against and compress the media around to make them moving, deformation, broken,
and blown apart. This is the direct impact of detonation products. When the target is
far from the explosion point, the damage of products is not very sharp. When
explosion is in the air or water, the expansion of explosion products compresses the
surrounding media, and produces shock waves. The transportation of the shock
waves in the media can damage the staff/materials far away from explosion. The
impact of explosion for the surrounding media has both close and far ranges.
Explosion blasting includes all mechanical impacts of explosion for the sur-
rounding materials. The blasting of explosives are related to the packed mass,
properties of explosives,
the geometric
figuration, and the surrounding media
property (within a distance).
Study of the explosion blasting helps to evaluate the explosion characteristics
and proper application of explosives, make the effectiveness of explosives com-
plete, and supply necessary theoretical basis for packing design [ 18
20 ].
-
2.3.1 Work Capacity of Liquid Explosives
The shock waves of explosion in free space, the soil compression and throwing of
explosion on the ground, the high-energy bubbles produced by the explosion under
the water, the deformation from the engineering blasting underground or in the
mines, and broken pieces produced in packing armed explosives have different
damage ability and killing effects. The work of liquid explosives has various forms.
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