How do impact hammers
There are two types
of breakage to consider, namely:
in rock excavation by hydraulic impact hammer is rare. Primary breakage
is only possible in weak intact rock containing extensive latent weaknesses
such as fissility, bedding planes, or other surfaces of considerable
weakness that will surely fracture and separate under hydraulic impact hammer
loading or during rock intact property testing.
is most common in rock, relying on discontinuities (actual breaks and in most
cases, separations in the rock). As such, the RQD may be used to predict
performance. However, the use of discontinuity spacing below the top of
rock and a function of depth promises to be a much more reliable method for
determining hydraulic impact hammer feasibility.
How to predict performance?
geotechnical parameters determine hydraulic impact hammer performance?
There are two categories
of rock properties to consider, namely:
rock properties and
parameters determine hydraulic impact hammer feasibility?
The most effective method for
predicting impact hammer performance is to use RQD, sonic, and seismic velocity by depth below the top