Description of the DPSH test
The DPSH dynamic penetration
test is a continuous test which consists of counting the number
of blows, N, needed to drive 20cm lengths of metal bar (N20)
The equipment used is a
DYNAMIC PENETROMETER with caterpillar wheels, model PDP 3.10D
(diesel) by TECOINSA. It functions hydraulically and is mounted
on hydraulic rubber caterpillars. The metal bar utilised measures
1000mm, 32mm Ø and has a 20cm non recuperable cone.
The reduced dimensions
of this drill enable us to work where there is a problem of limited
physical space (e.g. buildings to be demolished), or difficult
access (e.g. interior courtyards, hanging terraces, mountaineous
areas with no access route etc.) The weight of this apparatus
(<800kg) facilitates its transport by crane, earthmoving machine
or helicopter.
With these tests we obtain
the parameter N20, which enables us to calculate the resistance
to the dynamic penetration of the point and it is correlated with
the principles of geomechanical parameters.