of the permeability of the sustratum
geotechnical engineering the most utilised test in permeability
is the Lugeon test.
is a very ample procedure for estimating in depth the permeability
index . Its application is very useful for evaluating the global
permeability of a rocky mass, therefore it a method which is indicated
for terrains which are not very permeable and cohesive. It consists
of measuring the volume of water which can be injected into a borehole,
length L, time T, and at a determined pressure H which must be maintained
length of section to be tested will be isolated by a plug, the actual
bottom of the borehole acting as the inferior plug.
permeability (transmissivity) obtained is expressed in Lugeon units
(Lg) One Lugeon unit equals 1 litre per minute per metre, at a pressure
of 10 kg/cm² - this is approximately the equivalent of 1× 10-7