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HyperPAC® manages all the different steps of a pressuremeter test with very high pressure for very hard formations and rocks.
From the test readings (volume variation based on controlled pressure), a stress-strain curve can be obtained for the soil in the case of plane deformation.

Testing enables definition of three parameters:

• Ménard pressuremeter modulus (EM)

• Creep pressure (Pf)

• Limit pressure (Pl) 

HyperPAC® is available in  25MPa or 30 Mpa (option)

The borehole is drilled by coring or percussive method, so as to minimize wall disturbance. It has to keep a cavity diameter compatible with the probe size (46 mm or 74 mm).

The operator enters the different parameters of the test in GeoBOX® (borehole number, depth of the test, pressure of 1st pressure stage etc…). As soon as the probe is lowered into the borehole to the required test depth, GeoBOX® can launch the test execution. From now, HyperPAC® controls all the sequences of the whole process:standard test, pressure loss, volume loss, probes bleeding.

During the entire process, GeoBOX® offers a monitoring of the pending test on its screen (progression, real time view of the results, line graph etc…). At any time, the operator can decide to stop the test from GeoBOX®.