Answer / samiran bhattacharya

By measuring penetration of the casing pipe in to the
soil , popularly known as "set"while driving downward with
the impact of a free falling hammer or by means of some
other devices with a specific amount of energy. The hard
stratum can be ensured only when a predtermined specified
value of penetration with repect to specified transmitted
energy over the casing tube is achived

Answer / pvni

while driving a bore in soil with auger the soil which
comes from auger is tested at evry time.if it is like a
rock the sample is tested and find out how much strength is
having.
if it is enough to bear the up coming weight, pile should
be casted, or go for further driving.

Answer / suresh

while driving the hammer if the pile penetrates into the stratum only for one cm for three to five releases of the hammer, it is considered to be hard stratum.

Answer / sampath kumar

Depth of cutting should be less than 5 times dia of pile at
max force then we can confirm that stratum is Hard

Answer / p ch prasanth

we will perform sounding test and by this we will be able to know whether desired depth is achieved

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