How you Confirm the Hard stratum for Driven cat in situ Pile
work?

Answer Posted / 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

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