Pneumatic Fracturing is the injection of
gas at high pressure and flow in order to create fractures or fissures in soil
or rock matrix. Fractures or fissures occur when the pressure of injected gas
exceeds the natural in situ stresses and the flow rate exceeds the natural
permeability of the soils. In soil formations, Pneumatic Fracturing enhances
the permeability by creating fracture networks; while in rock, the effect is
dilation and extension of existing discontinuities; thereby improving the
interconnection between existing fractures. The immediate benefit of Pneumatic
Fracturing is improved access to subsurface contaminants so that liquids and
vapors can be transported and extracted rapidly, which represents a cost
savings in the installation and operational phases of a remediation project.
Another advantage of Pneumatic Fracturing is that it can be applied within
existing remedial systems as an enhancement and beneath or adjacent to existing
structures and/or utilities.